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Switch 7750
Installation Guide
3C16895 7-slot Chassis
3C16894 4-slot Chassis
and associated modules
http://www.3com.com/
Part No. 10014824
Published June 2005
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3Com Corporation
350 Campus Drive
Marlborough, MA
01752-3064
Copyright © 2005, 3Com Corporation. All rights reserved. No part of this documentation may be reproduced
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please contact 3Com and a copy will be provided to you.
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All technical data and computer software are commercial in nature and developed solely at private expense.
Software is delivered as “Commercial Computer Software” as defined in DFARS 252.227-7014 (June 1995)
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CONTENTS
ABOUT THIS GUIDE
Conventions 7
Related Documentation 8
SWITCH 7750 COMPONENTS
Switch Chassis 9
Switch Backplane 9
Fabric Module 10
Submodule Slot 11
Fixed Ports 12
Module LEDs 14
Power LEDs 14
Fan LED 14
Reset Button 14
Fabric 32 Submodules 14
4-Port 1000BASE-X-GBIC Submodule 14
4-Port 10/100/1000BASE-T Submodule 15
I/O Modules 16
48-port 10/100BASE-T FE PoE Module 17
48-port 10/100/1000BASE-T PoE Module 18
48-port 10/100BASE-T Auto-sensing FE Module 19
48-port 10/100/1000BASE-T Module 20
24-port 100BASE-FX MMF FE Module 22
20-Port 10/100/1000BASE-T Module 23
20-Port 1000BASE-X-SFP Module 24
8-port 1000BASE-X GBIC Module 25
8-port 10/100/1000BASE-T GE Module 27
1-Port 10GBASE-R-XENPAK Module 28
Power Module 29
Power Distribution 30
External PoE Power System 30
Fan Assembly 31
Switch 7750 Specifications 32
INSTALLING THE SWITCH 7750
Preparing to Install 33
General Safety Recommendations 33
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Electrical Safety 34
Moving the Switch 34
Laser Safety 34
General Site Requirements 34
Installation Space 35
Installation Checklist 35
Installing the Chassis 36
Installing in a Standard Cabinet 36
Installing on a Workbench 36
Installing the Cabling Rack 36
Installing a Module 37
Installing a Submodule 37
Connecting the Ground Wire 38
Connecting and Configuring Power 38
Connecting AC Power Cords 38
Connecting the PoE Power Cord 39
Installing the Fan Assembly 40
Installing Cables 40
Connecting the Console Cable 40
Connecting the AUX Cable 40
Connecting Module Cables 41
Installing Cabling 42
Bench-Mounted Switch 42
Rack-Mounted Switch 42
Cable Binding 42
Post-installation Checklist 43
CONFIGURING THE SWITCH 7750
Configuring the Switch 7750 and a Local Terminal 45
Setting Terminal Parameters 45
Booting the Switch 7750 48
Powering up and Booting 49
MAINTAINING SOFTWARE
Upgrading Software 51
Upgrading the Software Image 51
Upgrading Software with FTP 51
Upgrading Software Using The BOOT Menu 52
Upgrading Software Using Xmodem 56
Upgrading Software Using TFTP 58
Lost Passwords 59
Using the BOOT Menu 59
MAINTAINING HARDWARE
Replacing a Power Module 61
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Removing the AC Power Module 61
Installing the AC Power Module 61
Replacing a Power Supply 62
Replacing I/O Modules 63
Replacing the Fan Assembly 63
TROUBLESHOOTING
Troubleshooting the Configuration 65
No information is displayed on the terminal 65
The display characters are illegible 65
Troubleshooting Power 65
Troubleshooting the Fan 66
Troubleshooting the Modules 66
SWITCH 7750 CABLES
Console Cable 67
AUX Cable 67
Electrical Port Connector 68
Optical Fiber Cable Connectors 69
OBTAINING SUPPORT FOR YOUR SWITCH
Register Your Product to Gain Service Benefits 71
Purchase Value-Added Services 71
Troubleshoot Online 71
Access Software Downloads 71
Contact Us 72
Telephone Technical Support and Repair 72
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ABOUT THIS GUIDE
This guide describes the 3Com® Switch 7750 and how to install hardware,
configure and boot software, and maintain software and hardware. This guide
also provides troubleshooting and support information for your switch.
This guide is intended for qualified Service personnel who are responsible for
configuring, using, and managing the switches. It assumes a working knowledge
of local area network (LAN) operations and familiarity with communication
protocols that are used to interconnect LANs.
Always download the Release Notes for your product from the 3Com World Wide
Web site and check for the latest updates to software and product
documentation:
http://www.3com.com
Conventions Ta bl e 1 lists icon conventions that are used throughout this guide.
Ta bl e 1 Notice Icons
Icon Notice Type Description
Information note Information that describes important features or
Caution Information that alerts you to potential loss of data
Warning Information that alerts you to potential personal
Ta bl e 2 lists text conventions that are used throughout this guide.
Ta bl e 2 Text Conventions
Convention Description
Screen displays This typeface represents information as it appears on the
Keyboard key names If you must press two or more keys simultaneously, the key
The words “enter” and “type” When you see the word “enter” in this guide, you must type
instructions.
or potential damage to an application, system, or
device.
injury.
screen.
names are linked with a plus sign (+), for example:
Press Ctrl+Alt+Del
something, and then press Return or Enter. Do not press
Return or Enter when an instruction simply says “type.”
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8 ABOUT THIS GUIDE
Table 2 Text Conventions
Convention Description
Words in italics Italics are used to:
Emphasize a point.
Denote a new term at the place where it is defined in the
text.
Identify menu names, menu commands, and software
button names.
Examples:
From the Help menu, select Contents.
Click OK.
Words in bold Boldface type is used to highlight command names. For
example, “Use the display user-interface command
to...”
Related Documentation
The following manuals offer additional information necessary for managing your
Switch 7750:
■ Switch 7750 Command Reference Guide — Provides detailed descriptions of
command line interface (CLI) commands, that you require to manage your
Switch 7750.
■ Switch 7750 Configuration Guide— Describes how to configure your Switch
7750 using the supported protocols and CLI commands.
■ Switch 7750 Release Notes — Contains the latest information about your
product. If information in this guide differs from information in the release
notes, use the information in the Release Notes.
These documents are available in Adobe Acrobat Reader Portable Document
Format (PDF) on the CD-ROM that accompanies your router or on the 3Com
World Wide Web site:
http://www.3com.com/
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1
SWITCH 7750 COMPONENTS
The chapter describes the following Switch 7750 components:
■ Switch Chassis
■ Switch Backplane
■ Fabric Module
■ Fabric 32 Submodules
■ I/O Modules
■ Power Module
■ Power Distribution
■ External PoE Power System
■ Fan Assembly
■ Switch 7750 Specifications
Switch Chassis The Switch 7750 is available with a 4-Slot or 7-Slot chassis. Ta bl e 3 lists the
hardware features of each model.
Ta bl e 3 Hardware Features of the Switch 7750 Models
4-Slot Chassis 7-Slot Chassis
Fabric slots 1 1
I/O module slots 3 6
Fan slot 1 1
AC Power module slots 2 3
Switch Backplane The Switch 7750 backplane is part of the integrated chassis and delivers
high-speed data transfer between the Fabric and I/O modules. The backplane
bandwidth capacity is 96 Gbps.
The backplane supports the following functions:
■ Interconnection of signals between modules
■ Provides communication channels
■ Hot swapping for modules
■ Automatic recognition of slots
■ Distribution of power and management of the power supply for the system
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10 CHAPTER 1: SWITCH 7750 COMPONENTS
3C16857
Fabric Module There are two Fabric modules for the Switch 7750:
■ Fabric 64 (3C16857 or 3C16857R)
■ Fabric 32 (3C16872)
■ PoE Fabric 96 (3C16886)
The Fabric 64 and Fabric 32 are not interchangeable. You can install the Fabric 32
only in a 4-slot chassis. You can install the Fabric 64 only in the 7-slot chassis. You
can install the PoE Fabric 96 in both chassis.
The Fabric module is the core of Switch 7750 system. It has the following
functions:
■ Connects the I/O modules through the backplane and forwards Layer 2 and
Layer 3 data
■ Manages and calculates routing
■ Performs the switch’s software upgrade and system reset functions
■ Monitors system power and the fan frame
Figure 1 illustrates the front panel of the PoE Fabric 96.
Figure 1 PoE Fabric 96
3C16886
1
2
3
45 6
1 Compact Flash port
2 1000BASE-X-SFP ports
3 Console port
4 Ethernet port
5 Ethernet port LEDs
6 Fan LEDs
7 Power LEDs
8 I/O module LEDs
9 Reset button
Figure 2 illustrates the front panel of the Fabric 64.
Figure 2 Fabric 64
8
7
9
3C16857
1234
1 Reset button
2 Console port
3 Ethernet port
4 Ethernet port LEDs
56
7
Page 11
5 Fan LEDs
3C16872
6 Power module LEDs
7 I/O module LEDs
Figure 3 illustrates the front panel of the Fabric 32.
Figure 3 Fabric 32
3C16872
Fabric Module 11
1234567
1 Submodule slot
2 Console port
3 Ethernet port
4 Ethernet port LEDs
5 Fan LEDs
6 Power LEDs
7 I/O module LEDs
8 Reset button
Ta bl e 4 lists Fabric specifications.
Ta bl e 4 Fabric Specifications
PoE Fabric 96
Item
(3C16886)
Bandwidth 96 Gbps 64 Gbps 32 Gbps
CPU MPC8245 MPC8260 200 Mhz
BootROM 512 KB 1 MB
SDRAM 256 M 256 MB
Flash 32 MB 16 MB
Submodule slot 1
Dimensions (L x W) 366.7 mm x 340 mm (14.5 x 13.5 in)
Fabric 64 (3C16857
or 3C16857R)
Fabric 32 (3C16872)
8
External ports One console port that supports local and remote dial-up configuration
management of the switch.
One 10BASE-T/100BASE-TX port for upgrade and network
management
One Compact Flash
port for storing log
and host version and
for online software
upgrades
Four 1000BASE-X-SFP
ports
Maximum power
consumption
80 W 80 W 70 W (with
submodule)
Submodule Slot The submodule slot in the Fabric 32 offers extended Ethernet capacity using the
following submodules:
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12 CHAPTER 1: SWITCH 7750 COMPONENTS
■ 4-port 1000BASE-X-GBIC submodule
■ 4-port 10/100/1000BASE-T submodule
For more information on these submodules, see “Fabric 32 Submodules”on
page 14.
Fixed Ports The Switch 7750 Fabric modules provide the following fixed ports:
■ Compact Flash (CF) Port
■ 1000BASE-X-SFP (PoE Fabric 96 only)
■ Console Port
■ Ethernet Port
Compact Flash (CF) Port
The Fabric module provides a CF port to accommodate a standard CF card, where
you can save logging information, host version information, alarming and other
diagnostic information. You can also use the CF port to upgrade software online.
1000BASE-X-SFP Ports
The PoE Fabric 96 provides four 1000 Mbps full-duplex SFP ports. Ta bl e 5 describes
the SFP cables for these ports.
Ta bl e 5 Cables for 1000BASE-T-SFP Modules
Maximum
SFP Module
Wavelength
Connector Matching Cable
1000BASE-SX-SFP 850 nm LC 50/125 µm
Central
transmission
distance
550 m (1804 ft.)
multimode
optical fiber
cable
62/125 µm
275 m (902 ft.)
multimode
optical fiber
cable
1000BASE-LX-SFP 1310 nm 9/125 µm single
1000BASE-LH-SFP 30 km (19 mi.)
mode optical
fiber cable
10 km (6 mi.)
1000BASE-ZX-LR-SFP 1550 nm 40 km (25 mi.)
1000BASE-ZX-VR-SFP 70 km (43 mi.)
1000BASE-T-FD-SFP RJ-45 100 m (328 ft.)
Ta bl e 9 describes the LEDs of the SFP ports.
Ta bl e 6 SFP Port LEDs
LED Description
LINK/ACT Off — The line is not connected.
Green — The line is connected.
Green flashing — Data is being transmitted.
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Fabric Module 13
Console Port
The console port is connected to the configuration terminal using an RJ-45
connector. You can use the console port for system debugging, configuration,
maintenance, management, and loading application files.
The console port can also be connected to a modem for functions such as remote
system debugging, configuration, maintenance, and management. You can
configure the baud rate on the console port.
Ta bl e 7 lists console port specifications.
Ta bl e 7 Console Port Specifications
Specification Description
Port connector RJ-45
Port standard Asynchronous EIA/TIA-232
Baud rate 9600 bps (by default)
Transmission distance 15 m (45 ft)
Services Connects with character terminal
Connects with local or remote PC serial port and runs terminal
emulation on a PC (a pair of modems are required for a
remote connection)
Ethernet Port
The Ethernet port on the Fabric is connected to a computer using an RJ-45
connector. You can use the Ethernet port for system application downloading and
debugging. The Ethernet port can also be connected to devices such as a network
management workstation to manage the system remotely.
Ta bl e 8 lists Ethernet port specifications.
Ta bl e 8 Ethernet Port Specifications
Specification Description
Port connector RJ-45
Number of port(s) 1
Port speed 10 Mbps, half/full duplex
Cable and maximum transmission
distance
Port function Switch software upgrade and network management
100 Mbps, half/full duplex
MDI/MDIX auto sensing
Category-5 twisted pair for transmission within 100 m
(328 ft)
See “Electrical Port Connector” on page 68 for an illustration of the RJ-45
connector and MDI/MDI-X pinout details.
Ta bl e 9 describes the LEDs of the Ethernet port.
Ta bl e 9 Ethernet Port LEDs
LED Description
LINK Off — The line is not connected.
Green — The line is connected.
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14 CHAPTER 1: SWITCH 7750 COMPONENTS
Table 9 Ethernet Port LEDs (continued)
LED Description
ACTIVE Green — No data is being transmitted.
Module LEDs The module LEDs show the status of the I/O modules, as described in Tab le 10.
Ta bl e 10 I/O Module LEDs
LED Status description
RUN Green or off — The module failed or has not been inserted.
ALM Off — The module is working normally or has not been
Power LEDs PWR1, PWR2, and PWR3 LEDs show the status of the power modules, as
described in
Ta bl e 11 Power LEDs
Ta bl e 11.
Green flashing — Data is being transmitted.
Green flashing — The module is working normally.
inserted.
Green or green flashing — The module failed or is not
working normally.
LED Description
OK Green — The corresponding power module is working
normally.
Off — The corresponding power module is not working or
has not been installed.
FAIL Green — The corresponding power module is not working.
Off — The corresponding power module works normally or
has not been installed.
Fan LED Fan LEDs show the status of the fan frame, as described in Tab l e 12.
Ta bl e 12 Fan LEDs
LED Description
OK Green — The fan is working normally.
Off — The fan is not working or has not been installed.
FAIL Green — The fan is not working.
Off — The fan is working normally or has not been installed.
Reset Button The reset button resets the entire system.
Fabric 32 Submodules The Fabric 32 provides a slot for one submodule. The Fabric 32 supports the
following submodules:
4-Port 1000BASE-X-GBIC
Submodule
■ 4-Port 1000BASE-X-GBIC Submodule (3C16874)
■ 4-Port 10/100/1000BASE-T Submodule (3C16873)
The 4-port 1000BASE-X-GBIC submodule provides four GE full-duplex Ethernet
GBIC ports.
Figure 4 illustrates the 4-port 1000BASE-X-GBIC submodule.
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Fabric 32 Submodules 15
3C16873
Figure 4 4-Port 1000BASE-X-GBIC Submodule
3C16874
12
Ethernet GBIC port
2 Ethernet GBIC port LED
Ta bl e 13 describes the 4-port 1000BASE-X-GBIC submodule LEDs.
Ta bl e 13 4-Port 1000BASE-X-GBIC Submodule LEDs
LED Description
LINK/ACT Green — The link is operating normally.
Off — The link is not operating.
Green flashing — Data is being transmitted.
Ta bl e 14 lists the specifications for each of the 4-port 1000BASE-X-GBIC
submodule.
4-Port
10/100/1000BASE-T
Submodule
Ta bl e 14 4-Port 1000BASE-X-GBIC Submodule Specifications
Max.
Optional GBIC
Module
1000BASE-SX-MM
(3CGBIC91)
1000BASE-LX-SM-IR
(3CGBIC92)
1000BASE-LX-SM
(3CGBIC97)
Central
Wavelength
850 nm SC 50/125 µm
1310 nm SC 9/125 µm
1550 nm SC 9/125 µm
Connector
Type
Interface Fiber
Specifications
multi-mode fiber
62.5/125 µm
Multi-mode fiber
Single-mode fiber
Single-mode fiber
Transmission
Distance
500 m (1640 ft)
220 m (722 ft)
10 km (6 mi)
40 km (25 mi)
70 km (43.5 mi)
The 4-Port 10/100/1000BASE-T submodule provides four 10/100/1000 Mbps
auto-negotiation service ports.
Figure 5 illustrates the 4-port 10/100/1000BASE-T submodule.
Figure 5 4-Port 10/100/1000BASE-T Submodule
3C16873
12
1 Ethernet port
2 Ethernet port LEDs
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16 CHAPTER 1: SWITCH 7750 COMPONENTS
Ta bl e 15 describes the 4-port 10/100/1000BASE-T submodule LEDs.
Ta bl e 15 4-Port 10/100/1000BASE-T Submodule LEDs
LED Description
LINK Off — The link is not operating.
ACT Off — No data is being transmitted.
Ta bl e 16 lists specifications of the 4-port 10/100/1000BASE-T submodule.
Ta bl e 16 4-Port 10/100/1000BASE-T Submodule Specifications
Specification Description
Connector type RJ-45
Number of ports 4
Port speed 1000 Mbps full duplex
Cable and maximum
transmission distance
On — The link is operating normally.
Green flashing — Data is being transmitted.
100 Mbps half/full duplex
10 Mbps half/full duplex
MDI/MDI-X auto-sensing
Category 5 twisted pair up to 100 m (328 ft)
See “Electrical Port Connector” on page 68 for an illustration of the RJ-45
connector and MDI/MDI-X pinout details.
I/O Modules The Switch 7750 provides multiple slots for I/O modules below the Fabric slots.
The following I/O modules are supported:
■ 48-port 10/100BASE-T FE PoE Module (3C16891)
■ 48-port 10/100/1000BASE-T PoE Module (3C16890)
■ 48-port 10/100BASE-T Auto-sensing FE Module (3C16860)
■ 48-port 10/100/1000BASE-T Module (3C16888)
■ 24-port 100BASE-FX MMF FE Module (3C16861)
■ 20-Port 10/100/1000BASE-T Module (3C16863)
■ 20-Port 1000BASE-X-SFP Module (3C16862)
■ 8-port 1000BASE-X GBIC Module (3C16858)
■ 8-port 10/100/1000BASE-T GE Module (3C16859)
■ 1-Port 10GBASE-R-XENPAK Module (3C16875)
Consider the following when selecting I/O modules:
■ You can configure several I/O modules of the same type
■ Any combination of I/O modules can be inserted but only PoE I/O modules
provide the features of power over Ethernet.
■ You must select I/O module port cables that are compatible with each installed
I/O module
Page 17
I/O Modules 17
48-port 10/100BASE-T FE
PoE Module
The 48-port 10/100BASE-T FE PoE module provides 48 10/100 Mbps auto-sensing
Ethernet ports that provide a remote power supply to powered devices
Figure 12illustrates the 48-port 10/100BASE-T FE PoE module.
Figure 6 48-port 10/100BASE-T FE PoE Module
3C16891
Figure 13 illustrates the front panel and LEDs of the 48-port 10/100BASE-T FE PoE
module.
Figure 7 Front Panel of the 48-port 10/100BASE-T FE PoE Module
3C16891
2
1
1 Ethernet port
2 Ethernet port LED
Ta bl e 23 describes the 48-port 10/100BASE-T FE PoE Module LEDs.
Ta bl e 17 module LED
LED Description
LINK/ACT Green — The port is connected
Off — The port is not connected
Green flashing — Data is being transmitted
Ta bl e 24 describes the specifications for the 48-port 10/100BASE-T FE PoE module.
Ta bl e 18 Specifications for the 48-port 10/100BASE-T FE PoE Module
Specification Description
CPU MPC8241
BootROM 512 KB
SDRAM 128 M
Dimensions (L X W) 366.7 x 340 mm (14.4 x 13.4 in.)
Maximum power consumption 35 W
Connector RJ-45
Number of ports 48
Port transmission speed 10/100 Mbps half-/full-duplex MDI/MDI-X auto-sensing
Cables and maximum
transmission distance
100 m (328 ft.)
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18 CHAPTER 1: SWITCH 7750 COMPONENTS
Table 18 Specifications for the 48-port 10/100BASE-T FE PoE Module (continued)
Specification Description
Maximum power each port
provides
Compliance IEEE802.3
15.4 W
IEEE802.3u
IEEE802.3x
IEEE802.3ad
IEEE802.1p
IEEE802.1D
IEEE802.1Q
IEEE802.1X
IEEE802.1s
IEEE802.1w
IEEE802.3af
48-port
10/100/1000BASE-T PoE
Module
The 48-port 10/100/1000BASE-T PoE module provides 48 10/100/1000 Mbps
auto-sensing Ethernet ports that provide a remote power supply to powered
devices.
Figure 12illustrates the 48-port 10/100/1000BASE-T PoE module.
Figure 8 48-port 10/100/1000BASE-T PoE Module
3C16890
Figure 13 illustrates the front panel and LEDs of the 48-port 10/100/1000BASE-T
PoE module.
Figure 9 Front Panel of the 48-port 10/100/1000BASE-T PoE Module
3C16890
12
1 Ethernet port
2 Ethernet port LED
Ta bl e 23 describes the 48-port 10/100/1000BASE-T PoE module LEDs.
Ta bl e 19 48-port 10/100/1000BASE-T PoE Module LED
LED Description
LINK/ACT Green — The port is connected
Off — The port is not connected
Green flashing — Data is being transmitted
Page 19
I/O Modules 19
Ta bl e 24 describes the specifications of the 48-port 10/100/1000BASE-T PoE
module.
Ta bl e 20 Specifications for the 48-port 10/100/1000BASE-T PoE Module
Specification Description
CPU MPC8241
BootROM 512 KB
SDRAM 128 M
Dimensions (L X W) 366.7 x 340 mm (14.4 x 13.4 in.)
Maximum power consumption 70 W
Connector RJ-45
Number of ports 48
Port transmission speed 10/100/1000 Mbps half-/full-duplex
MDI/MDIX auto-sensing
Cables and maximum
transmission distance
Compliance IEEE802.3ab
Category 5 twisted pair with a maximum distance of 100 m
(328 ft.)
IEEE802.3
IEEE802.3i
IEEE802.3x
IEEE802.1p
IEEE802.1D
IEEE802.1Q
IEEE802.1X
IEEE802.1s
IEEE802.1w
48-port 10/100BASE-T
Auto-sensing FE Module
The 48-port 10/100BASE-T Auto-sensing FE module provides 48 external
100Mbps Ethernet electrical ports.
Figure 10 illustrates the 48-port 10/100BASE-T Auto-sensing FE module.
Figure 10 48-port 10/100BASE-T Auto-sensing FE Module
Figure 11 illustrates the front panel and LEDs of the 48-port 10/100BASE-T
Auto-sensing FE module.
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20 CHAPTER 1: SWITCH 7750 COMPONENTS
Figure 11 Front Panel of the 48-Port 10/100BASE-T Auto-sensing FE module
1 Ethernet port
2 Ethernet port LED
Each 100 Mbps Ethernet port has a green LED, indicating LINK/ACTIVE status.
Ta bl e 21 describes the 48-port 10/100BASE-T Auto-sensing FE module LED.
Ta bl e 21 48-Port 10/100BASE-T Auto-sensing FE module LED
LED Description
LINK/ACT Green — The port is connected
Ta bl e 22 describes the specifications of the 48-port 10/100BASE-T Auto-sensing FE
module.
12
Off — The port is not connected
Green flashing — Data is being transmitted
Ta bl e 22 Specifications for the 48-Port 10/100BASE-T Auto-sensing FE Module
Specification Description
CPU MPC850
BootROM 512 KB
SDRAM 64 MB
Dimensions (L X W) 366.7 x 340 mm (14.5 x 13.4 in)
Maximum power
consumption
Connector RJ-45
Number of ports 48
Port transmission
speed
Cables and maximum
transmission distance
Compliance IEEE802.3
55 W
10 Mbps half/full duplex
100 Mbps half/full duplex
MDI/MDIX auto-sensing
Cables are 2 100-ohm Category-5 twisted pairs up to 100 m (300 ft).
IEEE802.3u
IEEE802.3x
See “Electrical Port Connector” on page 68 for an illustration of the RJ-45
connector and MDI/MDI-X pinout details.
48-port
10/100/1000BASE-T
Module
The 48-port 10/100/1000BASE-T module provides 48 10/100/1000 Mbps
auto-sensing Ethernet electrical ports.
Figure 12 illustrates the 48-port 10/100/1000BASE-T module.
Page 21
I/O Modules 21
Figure 12 48-port 10/100/1000BASE-T Module
3C16888
Figure 13 illustrates the front panel and LEDs of the 48-port 10/100/1000BASE-T
module.
Figure 13 Front Panel of the 48-port 10/100/1000BASE-T Module
3C16888
12
1 Ethernet port
2 Ethernet port LED
Ta bl e 23 describes the 48-port 10/100/1000BASE-T module LEDs.
Ta bl e 23 48-port 10/100/1000BASE-T Module LED
LED Description
LINK/ACT Green — The port is connected
Off — The port is not connected
Green flashing — Data is being transmitted
Ta bl e 24 describes the specifications of the 48-port 10/100/1000BASE-T module.
Ta bl e 24 Specifications for the 48-port 10/100/1000BASE-T Module
Specification Description
CPU MPC8241
BootROM 512 KB
SDRAM 128 M
Dimensions (L X W) 366.7 x 340 mm (14.4 x 13.4 in.)
Maximum power consumption 70 W
Connector RJ-45
Number of ports 48
Port transmission speed 10/100/1000 Mbps half-/full-duplex MDI/MDI-X
auto-sensing
Cables and maximum
transmission distance
Compliance 1EEE 802.3ab
Category 5 twisted pair with a maximum transmission
distance of 100 m (328 ft.)
1EEE 802.3
1EEE 802.3u
1EEE 802.3x
1EEE 802.1p
1EEE 802.1D
1EEE 802.1Q
1EEE 802.1X
1EEE 802.1s
1EEE 802.1w
Page 22
22 CHAPTER 1: SWITCH 7750 COMPONENTS
24-port 100BASE-FX
MMF FE Module
The 24-port 100BASE-FX MMF FE module provides 24 100 Mbps multi-mode
Ethernet optical port service channels.
Figure 14 illustrates the 24-port 100BASE-FX MMF FE module.
Figure 14 24-Port 100BASE-FX MMF FE Module
Each 100 Mbps optical port has a green LED, as shown in Figure 15.
Figure 15 Front Panel of the 24-Port 100BASE-FX MMF FE Module
1
1 Ethernet port
2 Ethernet port LED
2
Ta bl e 25 describes the status of the 24-port 100BASE-FX MMF FE module LEDs.
Ta bl e 25 24-Port 100BASE-FX MMF FE Module LEDs
LED Description
LINK/ACT Green — The port is connected.
Off — The port is not connected.
Green flashing — Data is being transmitted or received.
The 24-port 100BASE-FX MMF FE module requires a 62.5/125 µm multi-mode
optical fiber cable with an MT-RJ connector and a central wavelength of 1300 nm.
Ta bl e 26 describes the specifications of the 24-port 100BASE-FX MMF FE module.
Ta bl e 26 Specifications for the 24-Port 100BASE-FX MMF FE Module
Specification Description
CPU MPC850
BootROM 512 KB
SDRAM 64 MB
Dimensions (L x W) 366.7 x 340 mm (14.5 x 13.4 in)
Maximum power
consumption
55 W
Page 23
I/O Modules 23
3C16863
Table 26 Specifications for the 24-Port 100BASE-FX MMF FE Module (continued)
Specification Description
Connector type MT-RJ
Number of ports 24
Port transmission speed 100 Mbps, full-duplex
Cables and maximum
transmission distance
Compliance IEEE 802.3
62.5/125 µm multi-mode optical fiber up to 2 km (1.3 mi)
IEEE 802.3i
IEEE 802.3u
IEEE 802.3x
20-Port
10/100/1000BASE-T
Module
The 20-Port 10/100/1000BASE-T module provides 20 10/100/1000BASE-T
auto-sensing Ethernet ports.
Figure 16 illustrates the 20-Port 10/100/1000BASE-T Module.
Figure 16 20-Port 10/100/1000BASE-T Module
Figure 17 illustrates the front panel of the 20-port 10/100/1000BASE-T module.
Figure 17 Front Panel of the 20-Port 10/100/1000BASE-T Module
3C16863
12
1 Ethernet port
2 Ethernet port LED
Ta bl e 27 describes the 20-port 10/100/1000BASE-T module LEDs.
Ta bl e 27 20-Port 10/100/1000BASE-T Module LEDs
LED Description
LINK/ACT Off — The port is not operating.
On — The port is operating.
Green flashing — The port is transmitting data
Page 24
24 CHAPTER 1: SWITCH 7750 COMPONENTS
3C16862
Ta bl e 28 lists specifications of the 20-port 10/100/1000BASE-T module.
Ta bl e 28 Specifications for the 20-Port 10/100/1000BASE-T Module
Specification Description
CPU MPC8241LZU200
BootROM 512 KB
SDRAM 64 MB
Dimensions (L x W) 366.7 x 340 mm (14.5 x 13.4 in)
Power consumption 45 W
Connector RJ-45
Number of ports 20
Transmission rate 10 Mbps half/full duplex
Cable and maximum
transmission distance
Compliance IEEE 802.3ab
100 Mbps half/full duplex
1000 Mbps full duplex
Category-5 twisted pair
100 m (300 ft)
IEEE 802.3
IEEE 802.3u
IEEE 802.3x
IEEE 802.1D
IEEE 802.1Q
20-Port 1000BASE-X-SFP
Module
The 20-port 1000BASE-X-SFP module provides 20 1000 BASE-X full duplex ports
and uses an SFP cable.
Figure 18 illustrates the 20-port 1000BASE-X-SFP module.
Figure 18 20-Port 1000BASE-X-SFP Module
Figure 19 illustrates the front panel of the 20-port 1000BASE-X-SFP module.
Figure 19 Front Panel of the 20-Port 1000BASE-X-SFP Module
3C16862
12
Page 25
I/O Modules 25
1 Ethernet port
2 Ethernet port LED
Ta bl e 29 describes the 20-port 1000BASE-X-SFP module LEDs.
Ta bl e 29 20-Port 1000BASE-X-SFP Module LEDs
LED Description
LINK/ACT Off — The port is not operating.
On — The port is operating.
Green flashing — The port is transmitting data
Ta bl e 30 lists specifications of the 20-port 1000BASE-X-SFP module.
Ta bl e 30 Specifications for the 20-Port 1000BASE-X-SFP Module
Specification Description
CPU MPC8241LZU200
BootROM 512 KB
SDRAM 64 MB
Dimensions (L x W) 366.7 x 340 mm (14.5 x 13.4 in)
Power consumption 35 W
Connector SFP socket
Number of ports 20
Transmission rate 1000 Mbps full duplex
Cable and maximum
transmission distance
Compliance IEEE 802.3z
1000BASE-SX-SFP (multi-mode optical fiber, short haul)
1000BASE-LX-SFP (single mode optical fiber, 1310 nm)
1000BASE-LH-SFP (single mode optical fiber, 1310 nm)
1000BASE-ZX-LR-SFP (single mode optical fiber, 1550 nm)
1000BASE-ZX-VR-SFP (single mode optical fiber, 1550 nm)
IEEE 802.1p
IEEE 802.1Q
IEEE 802.1D
IEEE 802.3x
IEEE 802.3ad
8-port 1000BASE-X GBIC
Module
The 8-port 1000BASE-X GBIC module provides 8 external GBIC module ports. A
GBIC module is used for each data receiving/transmitting channel. The following
modules are available:
■ 3CGBIC91
■ 3CGBIC92
■ 3CGBIC97
Figure 20 illustrates the 8-port 1000BASE-X GBIC module.
Page 26
26 CHAPTER 1: SWITCH 7750 COMPONENTS
Figure 20 8-Port 1000BASE-X GBIC Module
Every GBIC port has a LED, as shown in Figure 21.
Figure 21 Front Panel of the 8-Port 1000BASE-X GBIC Module
3C16858
12
1 GBIC port
2 GBIC port LED
Ta bl e 31 describes the 8-Port 1000BASE-X GBIC module LEDs.
Ta bl e 31 8-Port 1000BASE-X GBIC Module LEDs
LED Description
LINK Off — The link is not connected
ACT Off — No data is being transmitted
Green — The link is connected
Green flashing — Data is being transmitted or received
The cables for each of the supported 8GBIC modules are described inTa bl e 32.
Ta bl e 32 GBIC Module Port Cables
GBIC Module Type Central Wave Length
3CGBIC91 850 nm
3CGBIC92 1550 nm
3CGBIC97 1550 nm
Ta bl e 33 describes the specifications of the 8-port 1000BASE-X GBIC module.
Ta bl e 33 Specifications for the 8-Port 1000BASE-X GBIC Module
Specification Description
CPU MPC850
Page 27
I/O Modules 27
Table 33 Specifications for the 8-Port 1000BASE-X GBIC Module (continued)
Specification Description
BootROM 512 KB
SDRAM 64 MB
Dimensions (L x W) 366.7 x 340 mm (14.5 x 13.4 in)
Maximum power
consumption
Number of ports 8
Optional GBIC module
types
Port transmission speed 1000 Mbps, full duplex
Compliance IEEE 802.3z
50 W
3CGBIC 91
3CGBIC 92
3CGBIC 97
IEEE 802.3x
8-port
10/100/1000BASE-T GE
Module
The 8-port 10/100/1000BASE-T GE module provides 8 external 10/100/1000
Mbps auto-sensing Ethernet electrical ports.
Figure 22 illustrates the 8-port 10/100/1000BASE-T GE module.
Figure 22 8-Port 10/100/1000BASE-T GE Module
Each port on the 8-port 10/100/1000BASE-T GE module has 2 LEDs, as shown in
Figure 23.
Figure 23 Front Panel of the 8-Port 10/100/1000BASE-T GE Module
12
1 Ethernet port
2 Ethernet port LEDs
Page 28
28 CHAPTER 1: SWITCH 7750 COMPONENTS
Ta bl e 34 describes the LEDs on the 8-port 10/100/1000BASE-T GE module.
Ta bl e 34 8-Port 10/100/1000BASE-T GE Module LEDs
LED Description
LINK Off — The link is not connected
ACT Off — No data is being transmitted
Specifications of the 8-port 10/100/1000BASE-T GE module are described in
Ta bl e 35.
Ta bl e 35 Specifications for the 8-Port 10/100/1000BASE-T GE Module
Specification Description
CPU MPC850
BootROM 512 Kb
SDRAM 64 MB
Dimensions (L x W) 366.7 x 340 mm (14.5 x 13.4 in)
Maximum power consumption 50 W
Connector type RJ-45
Number of ports 8
Port transmission speed 10 Mbps, half/full duplex
Cables and maximum
transmission distance
Compliance IEEE 802.3ab
Green — The link is connected
Green flashing — Data is being transmitted or received
100 Mbps, half/full duplex
1000 Mbps, full duplex
4 100-ohm Category-5 non-shielded twisted pairs up to 100
m (300 ft).
IEEE802.3
IEEE802.3u
IEEE802.3x
1-Port
10GBASE-R-XENPAK
Module
The 1-port 10GBASE-R-XENPAK module provides a single 10 Gbps XENPAK
interface.
Figure 24 illustrates the 1-port 10GBASE-R-XENPAK module.
Figure 24 1-Port 10GBASE-R-XENPAK Module
3C16875
Figure 25 illustrates the front panel of the 1-port 10GBASE-R-XENPAK module.
Page 29
Power Module 29
Figure 25 Front Panel of the 1-Port 10GBASE-R-XENPAK Module
3C16875
12
1 XENPAK port
2 XENPAK port LEDs
Ta bl e 36 describes the 1-port 10GBASE-R-XENPAK module LEDs.
Ta bl e 36 1-Port 10GBASE-R-XENPAK Module LEDs
LED Description
LINK On — The port is operating
Off — The port is not operating
ACT Off — No data is being transmitted
Green flashing — Data is being transmitted
Ta bl e 37 lists specifications of the 1-port 10GBASE-R-XENPAK module.
Ta bl e 37 Specifications for the 1-Port 10GBASE-R-XENPAK Module
Specification Description
CPU MPC8245
BootROM 512 KB
SDRAM 64 MB
Dimensions (L x W) 366.7 x 340 mm (14.5 x 13.4 in)
Power consumption 35 W
Connector SC
Number of ports 1
Transmission rate 10 Gbps full duplex
Cable and maximum
transmission distance
Compliance IEEE 802.1p
10GBASE-LR-XENPAK (single mode optical fiber, 1310 nm 10 km)
10GBASE-ER-XENPAK (single mode optical fiber, 1550 nm 40 km)
IEEE 802.1Q
IEEE 802.1D
IEEE 802.3
IEEE 802.3u
IEEE 802.3x
IEEE 802.3ad
IEEE 802.3ae
Power Module Only one AC power module is required for the 4-slot chassis, although two power
module slots are provided to implement N+1 redundancy.
The 7-slot chassis provides three power module slots to implement N+1
redundancy. However, two power modules are sufficient to power one of these
fully loaded Switch 7750 systems.
Page 30
30 CHAPTER 1: SWITCH 7750 COMPONENTS
Ta bl e 38 describes the specifications of the Switch 7750 power module.
Ta bl e 38 Specifications for Switch 7750 Power Modules
Specification AC Power Module
Input 100 V to 240 V, 47 to 63 Hz, 6 A
Maximum output 350 W
Power Distribution The Switch 7750 power distribution box is installed on the chassis floor in the back
of the chassis. It filters, connects, disconnects and distributes electrical current to
the switch.
The power distribution box for the 4-slot chassis has two inputs and each input
has a separate ON/OFF switch. One input can support the normal operation of one
power module. Both AC inputs must be connected and switched on to provide
power to both power modules and to offer N+1 AC power redundancy. When
two power modules are installed but only one AC power input is working, only
one power module will operate. However, the Power Module LEDs on the Fabric
display alarm information for the power module that is not working.
External PoE Power System
The power distribution box for the 7-slot chassis has two inputs and two ON/OFF
switches. One input can support the normal operation of three AC power modules
at the same time. When both AC power inputs are connected and switched on,
the power distribution box offers N+1 AC power redundancy.
The Switch 7750 supports power-over-Ethernet (PoE). When the Switch 7750 is
equipped with an external PoE power system and PoE-capable I/O modules, it can
provide -48 V DC power to remote powered devices (PDs), such as IP phones,
WLAN APs, and network cameras through twisted pair cable.
Figure 26 illustrates the Switch 7750 PoE power system.
Figure 26 Switch 7750 PoE Power Supply
The Switch 7750 supports PoE external input power up to 2400 W.
Page 31
Fan Assembly 31
Ta bl e 39 describes the capabilities of the Switch 7750 PoE power module.
Ta bl e 39 PoE Power Modules
Power supplied Power modules
Input voltage
100 to 140 V 1200 W 2400 W 3
200 to 240 V 2400 W 2
1 Power module 2 Power module
needed for
redundancy
The Switch 7750 provides power through Ethernet ports on the PoE-supported I/O
modules, supporting the maximum distance of 100 m (328 ft.).
When the Switch 7750 provides power remotely, each Ethernet port can provide
up to 15.4 W of power to the connected PD.
Fan Assembly The fan assembly consists of two to four individual fans and is located on the right
side of the chassis:
■ 4-slot chassis — 3C16871
■ 7-slot chassis — 3C16856
The fans are directly connected to the backplane through connectors. Fan
operation fault signals are collected and transmitted to the system alarm board
through the backplane.
Figure 27 illustrates the fan assembly for the 7-slot chassis.
Figure 27 Fan Assembly
Page 32
32 CHAPTER 1: SWITCH 7750 COMPONENTS
Switch 7750 Specifications
Ta bl e 40 provides detailed information about features of the Switch 7750.
Ta bl e 40 Specifications for the Switch 7750 System
Item 4-Slot Chassis 7-Slot Chassis
Dimensions
(W x H x D)
Weight (with all
components)
Fabric slots 1 1
I/O module slots 3 6
Fabric submodule options 4-port 1000BASE-X-GBIC
I/O module options 48-port 10/100BASE-T FE PoE Module
Fabric performance 32 Gbps 64 Gbps
Maximum aggregate
system performance
Packet processing 24 Mpps 48 Mpps
Input voltage AC: 100 V to 240 V, 50 to 60 Hz
Max power consumption
(all components installed)
PoE input voltage -46 V to -55 V; 55.0 A
Environment temperature
and
humidity
436 x 352.8 x 480 mm
(17 x 14 x 19 in)
50 Kg (110 lbs) 70 Kg (154 lbs)
4-port 10/100/1000BASE-T
48-port 10/100/1000BASE-T PoE Module
48-port 10/100BASE-T Auto-sensing FE Module
48-port 10/100/1000BASE-T Module
24-port 100BASE-FX MMF FE Module
20-Port 10/100/1000BASE-T Module
20-Port 1000BASE-X-SFP Module
8-port 1000BASE-X GE Module
8-port 10/100/1000BASE-T GE Module
1-port 10GBASE-R-XENPAK Module
72 Gbps
54 Mpps
350 W 650 W
0 to 40 0 C (32 to 104 0 F) and 10% to 90%
436 x 486.2 x 480 mm
(17 x 19 x 19 in)
144 Gbps
108 Mpps
Page 33
2
INSTALLING THE SWITCH 7750
The following sections describe how to prepare and install the components of the
Switch 7750:
■ Preparing to Install
■ General Site Requirements
■ Installation Checklist
■ Installing the Chassis
■ Installing the Cabling Rack
■ Installing a Module
■ Installing a Submodule
■ Connecting the Ground Wire
■ Connecting and Configuring Power
■ Installing the Fan Assembly
■ Installing Cables
■ Connecting Module Cables
■ Post-installation Checklist
WARNING: Only trained and qualified personnel should install and maintain
3Com products.
Preparing to Install This section provides guidelines for preparing your site and switch for installation.
General Safety
Recommendations
Before installing your switch, note the following safety recommendations:
■ Switch off the power supply before connecting the cables.
■ Keep the switch away from heat sources.
■ To ensure normal heat dissipation, do not stack switches.
■ Do not keep the switch in a damp place, and prevent liquid from getting into
the switch.
■ Ensure that the neutral point of the power is grounded properly, to avoid
personal injury.
■ Ensure that the power is off before plugging or unplugging the modules and
cables of the switch.
■ Before moving the chassis, disconnect all the power cords and external cables.
■ To avoid damage to the switch, connect all the cables correctly. Never connect
telephone cables (including the ISDN lines) to the console or AUX port.
Page 34
34 CHAPTER 2: INSTALLING THE SWITCH 7750
■ During the installation, wear an antistatic wrist strap and antistatic gloves. See
“Static Electricity” on page 35 for additional information on preventing static.
WARNING: Follow local safety regulations when performing any operation with
the Switch 7750. Follow the related safety information and special safety
instructions provided by 3Com. 3Com bears no responsibility for accidents that
occur due to violations of safe operation requirements.
Electrical Safety To maintain electrical safety, note the following recommendations:
■ Look carefully for possible hazards in your work area, such as ungrounded
power extension cables, missing safety grounds, and moist floors.
■ Locate the emergency power-off switch in the room where you are working.
Shut the power off at once in the event of an accident.
■ Unplug all the power cords and external cables before moving the chassis.
■ Never assume that power is disconnected from a circuit. Always check.
Moving the Switch Use caution when moving the Switch 7750. Note the following recommendations
when moving the switch:
Laser Safety Some I/O modules on the Switch 7750 have optical ports. Make sure that an
General Site Requirements
■ Do not move the switch alone. Work with another person.
■ Move the switch slowly. Never move suddenly or twist your body.
■ Always disconnect all external cables (including power cord) before lifting or
moving the chassis.
■ Do not hold the power handles when carrying the switch.
■ Do not put fingers into the vent of the chassis when carrying the switch.
■ Since the power handles and vent have not been designed to bear the weight
of the entire chassis, using them to carry the switch may damage the switch or
even injure personnel.
optical connector is connected to the optical ports, or a dust proof cover is fitted,
as invisible laser radiation can be emitted from the port.
WARNING: Never look at the transmit LED/laser through a magnifying device
while it is powered on. Never look directly at the fiber TX port and fiber cable ends
when they are powered on.
The environment of the installation site influences the performance and lifetime of
the switch. The installation site for your switch should meet the requirements
described in the following sections.
Temperature and Humidity
To ensure normal operation and to prolong the operational lifetime of the switch,
the temperature and humidity of the equipment room must be within controlled
limits. The requirements for the temperature and humidity of the switch
installation site are listed in
Ta bl e 41.
Page 35
Installation Checklist 35
Ta bl e 41 Temperature and Humidity Requirements
Temperature Relative humidity (noncondensing)
00 to 400C (320 to 1040F) 10% to 90%
Static Electricity
To prevent damage caused by the static electricity, ensure that:
■ The equipment is grounded
■ The equipment room is dust-proof
■ Adequate temperature and humidity conditions are maintained.
■ The operator wears an antistatic wrist strap while handling the module.
■ The module is placed upward on the antistatic workbench, or put into an
antistatic bag.
■ Avoid direct contact with the elements of the circuit board.
Electromagnetic Discharge
To prevent damage by electromagnetic discharge, do the following:
■ Take effective measures against electrical interference for the power supply
system.
■ Separate the working ground of the switch from the grounding device of the
power equipment, or lightning conductor.
■ Adopt electromagnetic shielding if necessary.
Lightning Damage
To minimize the risk of lightning damage do the following:
■ Install a lightning arrester on the input end of a telephone cable, or other
external line.
■ Ensure that the PGND wire of the chassis is well grounded
■ Ensure that the neutral point of the socket of AC power supply is well
grounded
■ Install a lightning arrester at the input end of the power supply
Installation Space The Switch 7750 is a complex piece of equipment so it is necessary to make
arrangements for the installation position, power supply, and cabling.
For better heat dissipation and equipment maintenance, 3Com recommends that
you keep the front and back of the switch more than 1 meter (3 feet) away from
the walls or other devices. The sides of the switch should be at least 0.8 meters
(2.5 ft) away from the walls. If the optional cabinet is installed, the clear height of
room should be more than 3 meters (10 ft).
Installation Checklist When you open the packing case of the switch, check the contents against the
your order contract. Contact your Service representative if you find any
discrepancies.
To install the Switch 7750, you will need:
Page 36
36 CHAPTER 2: INSTALLING THE SWITCH 7750
■ Tools
■ Phillips screwdriver
■ Flat-head screwdriver
■ Antistatic wrist strap
■ Cables
■ Console cable
■ AUX cable
■ Power cord and chassis ground wire
■ Interface cables for the selected interface modules
■ Equipment
■ The switch
■ Ethernet 100BASE-T Hub or LAN switch
■ Channel service unit/data service unit (CSU/DSU) or other data
communications equipment (DCE) equipment (such as a modem)
■ Configuration terminal, such as a PC
■ Additional equipment for the selected interface modules
Installing the Chassis You can install the Switch 7750 in a standard, 19-inch cabinet or on a workbench.
Installing in a Standard
Cabinet
Installing on a
Workbench
When you are ready to install the Switch 7750 in the cabinet:
1 Carry the switch to the front of the cabinet. At least two people are required to
move the switch.
2 Put the switch on the tray or the guides and push it into the cabinet.
3 Fix the switch in the cabinet with the combination screw and floating nuts that are
shipped with the switch.
To install the switch on a workbench, take the following precautions:
■ Ensure that the workbench is smooth and stable.
■ Leave a heat-dissipation clearance in the front and back of the switch of more
than 1 m (3 ft) and at least 0.8 meters (2.5 ft) away from the walls on the sides.
■ Do not put heavy objects on the switch.
Installing the Cabling Rack
To install the cabling rack:
1 Attach the rack brace to the left side of the chassis (opposite the fan frame).
2 Insert the wiring channel into the brace and fasten the screws.
Page 37
Installing a Module To install a module:
1 Wear an antistatic wrist strap.
2 Remove the blanking plate from the chassis slot and save it for future use.
3 Hold the ejector levers of the module with both hands and push them outward.
4 Align the module with the guides in the chassis and slide it gently into the slot.
5 Push the module until the captive thumb screw on its handle bar touches the hole
in the chassis.
6 Push the ejector levers inward and push the handle bar pin into the positioning
hole in the chassis.
7 Fasten the module’s captive mounting screws into the holes in the chassis with a
screwdriver.
Installing a Module 37
Installing a Submodule
To install a submodule in the Fabric 32 you need the following tools:
■ Phillips-head screwdriver #2
■ Small pliers
Do the following:
1 Wear an antistatic wrist strap.
2 Unfasten the screws on the Fabric 32 printed circuit board at locations M11 and
M18.
3 Unfasten and remove the submodule blanking plate from the Fabric 32.
4 Fasten the screw with guide pin on the Fabric 32 printed circuit board at location
M2.1
5 Fasten the four hexagonal stand-off bolts at M3, M4, M11, and M18 on the Fabric
32 printed circuit board. Do not overtighten these bolts.
6 Position the submodule on the four hexagonal stand-off bolts, insuring that the
guide pin on the Fabric 32 matches the guide hole of the submodule.
7 Apply pressure near the edge connectors of the submodule to insure that the
submodule connector is firmly seated.
8 Insert and fasten screws into the bolts that you installed in Step 5.
To remove the submodule, reverse this procedure.
Page 38
38 CHAPTER 2: INSTALLING THE SWITCH 7750
Connecting the Ground Wire
Connecting and Configuring Power
Connecting AC Power
Cords
To connect the ground wire:
1 Wear an antistatic wrist strap.
2 Remove the screw from the grounding hole in the switch chassis.
3 Set the ground wire connector around the grounding screw.
4 Fasten the grounding screw in the hole on the chassis.
5 Connect the other end of the ground wire to the grounding bar of the switch.
If you install the switch in a cabinet, 3Com recommends that the ground wire of
the switch be connected to the grounding bar of the cabinet.
WARNING: The resistance between switch chassis and the ground should be less
than 1 ohm.
The Switch 7750 requires power connection from the AC power source and from
the PoE power rack.
To connect AC power cords:
1 Power off all the related parts of the switch before connecting the AC power cord
2 Plug the power cords into the sockets in the switch and attach the retention clips
to the power cord plugs.
3 Plug the other end of the cords into a socket strip with surge protector. Connect
the strip to the power source in the room.
Figure 28 illustrates the power cord connection.
Figure 28 Power Cord Connection
1 AC power sockets
2 Retention clips
3 Grounding screw
WARNING: For surge protection, the power should be channelled through an
external protection device into the Switch 7750.
Page 39
Connecting and Configuring Power 39
Connecting the PoE
Power Cord
Follow these steps to connect the power cord from the PoE rack:
1 Loosen the mounting screw of the PoE terminal block on the rear panel of the
switch.
2 Insert the -48V OT terminal of the DC power cord to the NEG (-) terminal of the
switch and fasten the mounting screw; insert the other end to the NEG (-) terminal
of the external PoE power supply. See
Figure 29 Back of the PoE Rack
1 PoE external power input: NEG (-)
2 (+) PoE external power input: NEG (+)
3 COM port (external power monitor)
Figure 29 for a detailed view.
3 Insert the GND OT terminal of the DC power cord to the RTN (+) terminal of the
switch and fasten the mounting screw; insert the other end to the NEG (-) terminal
of the site power.
Figure 30 Front Panel of the PoE Rack
1 AC input socket
2 DC output terminal: NEG (-)
3 DC output terminal: RTN (+)
4 RS232 serial port
4 Insert the PGND OT terminal of the DC power cord to the grounding screw of the
switch and fasten the mounting screw; insert the other end to the grounding bar
for the switch.
For detailed instructions on how to install the PoE rack, see the Switch 7750 PoE
Rack Installation Guide.
Page 40
40 CHAPTER 2: INSTALLING THE SWITCH 7750
Installing the Fan
To install the fan:
Assembly
1 Wear an antistatic wrist strap.
2 Remove the fan frame from the pack.
3 Hold the ejector levers on the fan frame with both hands and push them outward.
4 Align the fan with the guides in the chassis and slide it gently into the slot.
5 Push the fan until its positioning pin touches the hole in the chassis.
6 Push the ejector levers inward.
7 Push the handle bar pin into the hole in the chassis.
WARNING: To avoid injury, do not touch any naked wire, terminal, or any other
part of the product labelled Dangerous Voltage. Always wear the antistatic wrist
strap when installing the fan.
Installing Cables This section describes how to connect console and AUX cables to the Switch
7750.
Connecting the Console
Cable
The console cable is an 8-core shielded cable. One end of the cable has a crimped
RJ-45 connector, which is plugged into the console port of the switch. The other
end has both a DB-9-hole connector and a DB-25-hole connector for connection
to a 9-hole or 25-hole serial port at the configuration terminal.
Connecting the AUX
Cable
See “Console Cable” on page 67 for cable illustration and pinout details.
To connect a terminal or PC to the Switch 7750 using the console cable:
1 Plug the DB-9 or DB-25 female plug of the console cable to the serial port of the
PC or the terminal where the switch is to be configured.
2 Connect the RJ-45 connector of the console cable to the console port of the
switch.
An AUX cable is used to connect the Switch 7750 to a modem in a remote dial-up
configuration.
The AUX cable is an 8-core shielded cable. One end of the cable is an RS-232
RJ-45 connector, which is used to plug into the switch at the console port. The
other end has both a DB-9-pin connector and a DB-25 pin for connection to a
9-hole or 25-hole serial port on the virtual modem.
See “AUX Cable” on page 67 for cable illustration and pinout details.
To connect the AUX cable:
1 Plug the RJ-45 end of the AUX cable into the switch console port.
2 Connect the DB-25 or DB-9 end of the AUX cable to the serial port of the virtual
modem.
Page 41
Installing Cables 41
Connecting Module
Cables
This section describes how to connect electrical and optical cables.
Connecting Electrical Port Cables
The 48-port 10/100BASE-T module and 8-port 10/100/1000BASE-T module
require a RJ-45 connector and category-5 twisted pair cable. See
“Electrical Port
Connector” on page 68 for an illustration of the RJ-45 connector and MDI/MDI-X
pinout details.
Use the following steps to connect the port:
1 Plug one end of the straight-through cable into the Ethernet RJ-45 port of the
switch.
2 Plug the other end of the straight-through cable into the RJ-45 port of the hub or
LAN Switch.
Ports on 48-port 10/100BASE-T and 8-port 10/100/1000BASE-T modules support
MDI/MDI-X auto-sensing.
Connecting Optical Fiber Cables
The following modules require fiber optic cables:
■ 24-port 100BASE-FX MMF FE module
■ 20-port 1000BASE-X-SFP module
■ 1000BASE-SX-MM, 1000BASE-LX-SM-IR, and 1000BASE-LX-SM optional GBIC
modules for the 4-port 1000BASE-X-GBIC submodule
When connecting optical fiber cables, use the fiber connectors that are
appropriate for the optical port type of the peer equipment that is connected to
the local network port module. See
“Optical Fiber Cable Connectors” on page 69
for illustrations of the fiber optic cable connectors.
Single-mode optical fiber cable is used for external connections of the single-mode
optical port. Multi-mode optical fiber cable is used for external connections of the
multi-mode optical port.
Before connecting the optical fiber cable, make sure the type of the connector and
the optical fiber cable are consistent with the optical port type.
WARNING: When a connector is not inserted in the optical port or when its
dustproof cover is open, invisible radiation can escape from the optical port. Do
not stare into the optical port directly. Cover the optical port if there is no
connector plugged in.
SC fiber connector
The 8-port 1000BASE-X GBIC module requires an SC optical fiber connector.
To attach the SC fiber connector:
1 Plug one end of the SC fiber connector into the optical port in the module.
2 Connect the other end of the connector to the corresponding device.
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42 CHAPTER 2: INSTALLING THE SWITCH 7750
CAUTION: When connecting an SC fiber connector, the switch TX must be
connected to the RX of the device on the network, and the switch RX must be
connected to the TX of the device on the network.
MT-RJ fiber connector
The 24-port 100BASE-FX MMF FE module requires an MT-RJ optical fiber
connector.
To attach the MT-RJ fiber connector:
1 Plug the MT-RJ fiber connector in the optical port into the module.
2 Connect the other end of the fiber connector to the corresponding device.
Installing
This section describes how to install and bind cables for your Switch 7750.
Cabling
Bench-Mounted Switch If you have installed your chassis on a bench, all interface cables run on the left
side of the chassis in the cabling channel, and the chassis power cords run by the
rear chassis panel.
Rack-Mounted Switch If you have installed your switch in a 19-inch standard rack, the cables are bound
on the cable binding rack at the left side of the chassis and arranged to run on the
cable rack or under a raised floor. Collect all the transit data signal cable
connectors and locate them on the floor of the chassis. Power cords run out of the
rear left of the chassis and on a cable rack or under a raised floor.
Cable Binding Keep the following precautions in mind as you bind cables:
■ Do not allow cables to twist or bend as you bind them.
■ The cable body cannot be bent at an angle that is more than twice its diameter.
The cable running out of a connector cannot be bent more than five times its
diameter.
■ Different types of cables (power cord, signal cable, and ground wire) should
not be bound together in a cabinet. Although different types of cable may
cross over each other, they must not be bound together where they cross. For
parallel cabling, the space between a power cord and a signal cable should be
no less than 30 mm (1.25 in).
■ The cable binding rack and cable channel inside and outside a cabinet should
be smooth.
■ The hole through which a cable runs through should be smooth or have a
rubber grommet.
■ Use plastic cabling ties to bind the cables.
■ Bind cables before bending them. Ensure that no tie binds the bent part of any
cables to prevent the core of the cable from breaking.
■ Do not tie power cables to the guides of any mobile components.
■ For the cable terminals fixed with screws, the screws or nuts should be
fastened securely.
■ Do not use tapping screws to fasten the cabling terminals.
Page 43
Post-installation Checklist 43
Follow the parameters defined in Tab le 42 for binding cables with ties.
Ta bl e 42 Cable Binding Parameters
Cable Bundle Diameter Space Between Bundles
10 mm (0.5in) 80-150 mm (3.5 – 6 in)
10-30 mm (.5 – 1.2 in) 150-200 mm (6 – 8 in)
30 mm (1.2 in) 200-300 mm (8 – 12 in)
Post-installation Checklist
After you install your switch, use the checklist in Ta bl e 43 to verify that your switch
operates correctly.
WARNING: Confirm that you have turned off the power before checking your
installation. Improper connections can injure people or damage components of
the switch.
Ta bl e 43 Installation Checklist
Item Normal Abnormal (Remarks)
Antistatic wrist strap
Console cable
Ground wire
Power cord
Fabric
I/O module
Fan frame
Page 44
44 CHAPTER 2: INSTALLING THE SWITCH 7750
Page 45
3
CONFIGURING THE SWITCH 7750
The following sections of this chapter describe how to configure and boot the
Switch 7750:
■ Configuring the Switch 7750 and a Local Terminal
■ Setting Terminal Parameters
■ Booting the Switch 7750
Configuring the Switch 7750 and a Local Terminal
Configure the local terminal and Switch 7750, using Figure 31 as a reference. The
terminal (a PC in this example) is connected to the switch console port using a
console cable.
Figure 31 Connecting the Switch 7750 to a PC
Switch
Console cable
1 Plug the DB-9 or DB-25 female plug of the console cable into the serial port of the
PC or the terminal where the switch will be configured.
2 Connect the RJ-45 connector of the console cable to the console port of the
switch.
Setting Terminal Parameters
To set terminal parameters and open a HyperTerminal session:
1 Start the PC and select Start > Programs > Accessories > Communications >
HyperTerminal.
The Connection Description dialog box displays, as shown in Figure 32.
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46 CHAPTER 3: CONFIGURING THE SWITCH 7750
Figure 32 Connection Description Dialog Box
2 Enter the name of the new connection in the Name field and click OK. The dialog
box, shown in
Connect using dropdown menu.
Figure 33 displays. Select the serial port to be used from the
Figure 33 Properties Dialog Box
3 After selecting serial ports, click OK. The port shown in Figure 34 displays and you
can set serial port parameters. Set the following parameters:
■ Baud rate = 9600
■ Databit = 8
■ Parity check = none
■ Stopbit = 1
■ Flow control = none
Page 47
Figure 34 COM1 Properties Dialog Box
Setting Terminal Parameters 47
4 Click OK. The HyperTerminal dialogue box displays, as shown in Figure 35.
Figure 35 HyperTerminal Window
5 Select Properties.
6 In the Properties dialog box, select the Settings tab, shown in Figure 36.
7 Select VT100 in the Emulation dropdown menu.
8 Click OK.
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48 CHAPTER 3: CONFIGURING THE SWITCH 7750
Figure 36 Settings Tab
Booting the Switch 7750
Before powering on the Switch 7750, verify that:
■ Power cords have been properly connected.
■ The voltage of power supply can meet the requirements on the switch.
■ The console cable has been connected properly.
■ The PC or terminal for configuration has been started.
■ The terminal parameters have been set.
Page 49
Booting the Switch 7750 49
Powering up and
Booting
Turn on the power for the Switch 7750 and run the BootROM program. The
terminal displays the following information:
Starting......
RAM Line....OK
System is booting.....................
******************************************
* *
* Switch 7750 BOOTROM, Version 300 *
* *
******************************************
Copyright(C) 2001-2005 by 3Com Corporation, Inc.
Creation date: Mar 25 2003, 09:33:05
CPU type : MPC8260
CPU Clock Speed : 200Mhz
BUS Clock Speed : 66Mhz
Memory Size : 256MB
FAB64 self testing...............................
60X_SDRAM Data lines Selftest.............................OK!
60X_SDRAM Address lines Selftest..........................OK!
60X_SDRAM fast selftest...................................OK!
Please check LEDs.....................LEDs selftest finished!
Switch chip selftest......................................OK!
CPLD selftest.............................................OK!
The switch Mac address is .....................00E0.FC00.7505
Press Ctrl+B to enter Boot Menu... 5
To enter Boot Mode (see Chapter 6), press Ctrl+B during the 5 seconds that “Press
Ctrl+B to enter Boot Menu...5” is displayed. To perform decompression
immediately, press ESC while this message is displayed. If you do nothing, the
system enters the following auto-booting port within 5 seconds:
Auto-booting....................
Auto booting file is sw7750001.app
There are 2 files in this packet
FAB64 app file <<FAB64001.app>> is...OK
Decompress
Image...............................................................
....................................................................
....................................................................
....................................................................
..............OK!
Starting at 0x60000...
User interface Aux0 is available
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50 CHAPTER 3: CONFIGURING THE SWITCH 7750
The display of these messages indicates the completion of the switch
auto-booting. Press Enter and the terminal screen displays:
<3Com>
You can now begin the configuration for the Switch 7750.
Page 51
MAINTAINING SOFTWARE
4
This chapter covers the following topics:
■ Upgrading Software
■ Lost Passwords
■ Using the BOOT Menu
Upgrading Software The following sections describe how to upgrade software on your Switch 7750:
■ Upgrading the Software Image
■ Upgrading Software with FTP
■ Upgrading Software Using The BOOT Menu
■ Upgrading Software Using Xmodem
■ Upgrading Software Using TFTP
Upgrading the Software
Image
Upgrading Software
with FTP
Always save the configuration file before upgrading applications.
To upgrade the software image of a Switch 7750, use one of the following
procedures:
■ “Upgrading Software with FTP” on page 51
■ “Upgrading Software Using The BOOT Menu”page 52
■ “Upgrading Software Using Xmodem” page 56
■ “Upgrading Software Using TFTP” page 58
Use the following procedure to upgrade software with FTP:
1 Log in to the system with super-user privileges.
2 From the SW7750 command line, transfer the file from the FTP server to the
system, using the
ftp command.
3 Specify the file to boot the system from, using the boot command.
4 Reboot the system, using the reboot command.
The following example illustrates this procedure:
<SW7750>su
Password:
Now user privilege is 3 level, and just commands which level is
equal to or less than this level can be used.
Privilege note: 0-VISIT, 1-MONITOR, 2-SYSTEM, 3-MANAGE
<SW7750>ftp 10.10.110.1
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52 CHAPTER 4: MAINTAINING SOFTWARE
Trying ...
Press CTRL+K to abort
Connected.
220 3Com 3CDaemon FTP Server Version 2.0
User(none):anonymous
331 User name ok, need password
Password: xxxxxxx
230 User logged in
[ftp]bin
200 Type set to I.
[ftp]get sw7750003.app
200 PORT command successful.
150 File status OK ; about to open data connection
226 Closing data connection; File transfer successful.
FTP: 3794803 byte(s) received in 130.480 second(s)
29.08Kbyte(s)/sec.
[ftp]quit
221 Service closing control connection
Upgrading Software
Using The BOOT Menu
<SW7750>boot boot-loader primary sw7750003.app
The specified file will be booted next time!
<SW7750>reboot
This will reboot Switch. Continue? [Y/N] y
For more detailed descriptions of the setup and procedures for upgrading
software, see the remaining sections in this chapter.
To perform this procedure, you must have a network connection to the
management port on the Switch 7750 Fabric module.
After powering on the Switch 7750, the BootROM program runs automatically.
The terminal displays the following information:
Starting......
RAMLine.....OK
System is booting.....................
******************************************
* *
* Switch 7750 BOOTROM, Version 500 *
* *
******************************************
Copyright (c) : 2003-2005 3Com Corporation
Creation date : Jan 20 2005, 09:37:12
CPU type : MPC8245
CPU Clock Speed : 400Mhz
BUS Clock Speed : 66Mhz
BOOT_FLASH type : M29W040B
Flash Size : 32MB
Memory Size : 256MB
Page 53
Upgrading Software 53
FAB96 self testing..........................................
SDRAM Data lines Selftest.................................OK!
SDRAM Address lines Selftest..............................OK!
SDRAM fast selftest.......................................OK!
Please check LEDs.....................LEDs selftest finished!
CPLD selftest.............................................OK!
FPGA selftest.............................................OK!
The switch Mac address is .....................0020.4C6A.CF04
Press Ctrl+B to enter Boot Menu...
1 Press Ctrl+B. The system displays the prompt for the BootROM password:
Password :
To access the BOOT Menu, press Ctrl+B during the five seconds that “Press Ctrl-B
to enter Boot Menu...” displays. After five seconds, the system begins program
decompression. If you want to access the BOOT Menu after this, you must reboot
the switch.
2 Enter the BootROM password. After entering the correct password (no password
is set for the switch by default), the system will access the BOOT Menu:
CAUTION: While using the switch, keep in mind the modified BOOTROM
password.
Boot Menu
1: Download application file to flash
2: Select application file to boot
3: Display all files in flash
4: Delete file from flash
5: Modify bootrom password
0: Reboot
Enter your choice(0-5):
Downloading an Application to Flash Memory
To download an application to flash memory:
1 Select option 1 on the Boot Menu. The following menu displays:
1. Set TFTP protocol parameter
2. Set FTP protocol parameter
3. Set XMODEM protocol parameter
0. Return to boot menu
Enter your choice(0-3): 1
2 Select option 1 then enter the appropriate information in the fields that display:
Load File name :sw7750003.app
Switch IP address :10.10.110.1
Server IP address :10.10.110.50
3 Ty pe Y at the download prompt so the system downloads the file to flash:
Are you sure to download file to flash? Yes or No(Y/N) y
4 After the download is complete, select option 0 to return to the boot menu.
5 From the boot menu, select option 2 then select the newly downloaded file.
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54 CHAPTER 4: MAINTAINING SOFTWARE
Selecting the Application File for the Boot
If the Switch 7750 primary image fails because of a CRC error or a file format
error, you can configure the system to find the backup image you select to boot
from.
To select the image file that you want the system to boot from:
1 Select 0 to return to the Boot Menu.
2 Select option 2 from the Boot Menu. The following text displays:
File Number File Size(bytes) File Name
========================================================
1. 4 snmpboots
2(-). 6256229 SW7750-V300RE-8016.app
3. 1012 taskswitch.log
4. 151 private-data.txt
5. 228308 s.t
6. 1975 sw7750.cfg
7. 631736 Btm400.btm
8(*). 462848 SW7750-V300R-.app
9. 228376 S3com400.app
10. 199696 8241btm.app
11. 2427 vrpcfg.txt
12. 203460 lpcom400.app
13. 228308 snec400.app
The current application file is :SW7750-V300R-.app
The backup application file is :SW7750-V300RE-8016.app
Free Space : 7536640 bytes
3 Enter the file number of the primary image:
Please input the primary image file number :13
4 To confirm this choice, type Y at the prompt:
The primary file you selected is snec400.app, are you sure? Yes or
No(Y/N) Y
On reboot,snec400.app will become the default application file to
boot!
5 Enter the file number of the backup image:
Please input the backup image file number : 8
6 To confirm this choice, type Y at the prompt:
Page 55
Upgrading Software 55
The file you selected is SW7750-V300R-.app, are you sure? Yes or
No(Y/N) y
On reboot,SW7750-V300R-.app will become the default application file
to boot!
7 Ty pe Y to run the primary image:
Do you want to run snec400.app now? Yes or No(Y/N)? Y
No Backup Image If you do not enter the number of a backup boot file, the
following text displays:
Please input the backup boot file number :
Input Error!
Failed to select backup image file!
Ty pe Y to run the primary boot file:
Do you want to run snec400.app now? Yes or No(Y/N)? Y
Backup Image Fails If the backup image fails and another backup image
configuration does not exist, the Switch 7750 will try to find any valid image on
the flash. This image is not the primary or backup image:
All Images Fail If all images fail, the Switch 7750 will return to the boot menu:
primary image : snec400.app
backup image : SW7750-V300R-.app
There is one passed image in addition:
File Number File Size(bytes) File Name
========================================================
1. 6256229 SW7750-V300RE-8016.app
Press Ctrl+B to enter Boot Menu... 0
Auto-booting....................
Auto booting file is snec400.app
No LPU application file < vxworks.app > in flash
Please download LPU application file vxworks.app to flash
No correct main file to boot!
loading backup image file to boot!
Auto booting backup file is SW7750-V300R-.app
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56 CHAPTER 4: MAINTAINING SOFTWARE
Assert at file: 'vfs_flsh.c', Line: 4549
There are 3 files in this package
SRPU app file error! backup boot file is corrupted!
Select a file to boot from!
the num is 1
the num is 2
File SW7750-V300RE-8016.app is selected for autoBoot:
backup file is SW7750-V300RE-8016.app
There are 3 files in this package
SRPU app file <<FAB64R.app>> is...OK
Decompress
Image...............................................................
Upgrading Software
Using Xmodem
....................................................................
....................................................................
....................................................................
........................................OK!
Starting at 0x60000...
The primary image name is saved in flash memory, the secondary image name is
saved in the EPPROM. However, if you use the display boot command to display
the boot image it will only read from flash so only the primary image will be
displayed. The secondary boot image name cannot be displayed when there is an
image error.
The Xmodem protocol transmits files through serial ports and supports both
128-byte and 1K-byte packets. Xmodem also supports two types of check; normal
checksum and CRC. When there is a packet error, retransmission is supported,
normally 10 times.
The Xmodem protocol completes transmission by receiving and sending programs.
The receiving program first sends the negotiating characters to negotiate the
check means. After passing the negotiation, the sending program begins to send
the packet.
The receiving program checks the packet according to the negotiated means after
receiving a complete packet. The acknowledgement characters are sent after
passing the check and then the sending program continues to send the next
Page 57
Upgrading Software 57
packet. If the check fails, negative characters are sent and the sending program
sends the packet again.
1 Enter 1 in the BOOT Menu and press Enter. The system accesses the download
application file menu:
1. Set TFTP protocol parameter
2. Set FTP protocol parameter
3. Set XMODEM protocol parameter
0. Return to boot menu
Enter your choice (0-3):
2 Enter 3 in the download program menu.
Enter your choice(0-3): 3
3 Press Enter. The system enters the download rate-setting menu:
Please select your download baudrate:
1. 9600
2. 19200
3. 38400
4. 57600
5. 115200
0. Exit
Enter your choice (0-5):
4 Select the appropriate download speed. For example, enter 5 to select a download
speed of 115200bps.
5 Press Enter. The terminal displays the following information:
Download baudrate is 115200 bps. Please change the terminal’s
baudrate to 115200 bps, and select XMODEM protocol.
Press enter key when ready.
6 Change the baud rate set at the configuration terminal, so that the baud rate is
consistent with the selected download baud rate of the software.
7 Disconnect the terminal and reconnect it.
8 Press Enter to start downloading. The terminal displays the following information:
Now please start transfer file with XMODEM protocol.
If you want to exit, Press <Ctrl+X>.
Waiting ... CCCCC
9 Select Transfer\Send File from the terminal window.
10 Click Browse in the Send file dialog box, shown in Figure 37 and select the
application you want to download.
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58 CHAPTER 4: MAINTAINING SOFTWARE
Figure 37 Send File dialog box
11 Change the protocol name for the download to Xmodem.
12 Click Send. The dialog box shown in Figure 38 displays.
Figure 38 Xmodem File Send Dialog Box
Upgrading Software
Using TFTP
13 After the download is complete, the system interface is shown, as follows:
Loading ...CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC done!
14 Select 0 to return to the Boot Menu.
15 From the boot menu, select option 2 then select the newly downloaded file.
TFTP (Trivial File Transfer Protocol) is a simple file transfer protocol that is used
without complex interaction between clients and servers.
The client initiates a TFTP transmission. To download files, the client sends a read
request packet to the TFTP server, receives the packet from the server, and sends
the acknowledgement to the server. To upload files, the client sends a write
request packet to the TFTP server, sends the data packet to the server, and receives
the acknowledgement from the server.
The Switch 7750 provides the functions of the TFTP client.
Page 59
Lost Passwords 59
A TFTP Server program is shipped on the CDROM with the Switch 7750.
Before you upgrade:
■ Verify that there is a connection between the TFTP server and the Switch 7750
(use the
■ Verify that the TFTP server is set up according to the manufacturer's instructions
ping command.)
and that it is enabled and pointing to the correct directory.
To upgrade using TFTP:
1 Verify that you are logged in with super-user privileges.
2 From the Switch 7750 command line (in user view), TFTP the image file from the
TFTP server to the Switch 7750 using the following command:
tftp <TFTP Server IP Address> get <Source File/image>< Dest
File-Optional>
3 Set the boot parameters to specify the file to boot the system from, using the
following command:
boot boot-loader primary filename
4 Reboot the system.
The following example illustrates this procedure:
<SW7750>tftp 10.10.110.1 get sw7750003.app
Transfer file in binary mode.
Now begin to download file from remote tftp server, please wait...
/
TFTP: 5690749 bytes received in 376 second(s).
File downloaded successfully.
<SW7750>boot boot-loader primary sw7750003.app
The specified file will be booted next time!
<SW7750>reboot
This command will reboot the system. Continue? [Y/N] y
Lost Passwords If the BootROM password of the switch is lost, contact your local support center,
listed in
Appendix B.
Using the BOOT Menu After you power on the Switch 7750, the BootROM program runs automatically.
The terminal displays the following information:
Starting......
RAMLine.....OK
System is booting.....................
******************************************
* *
* Switch 7750 BOOTROM, Version 500 *
* *
******************************************
Copyright (c) : 2003-2005 3Com Corporation
Creation date : Jan 20 2005, 09:37:12
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60 CHAPTER 4: MAINTAINING SOFTWARE
CPU type : MPC8245
CPU Clock Speed : 400Mhz
BUS Clock Speed : 66Mhz
BOOT_FLASH type : M29W040B
Flash Size : 32MB
Memory Size : 256MB
FAB96 self testing..........................................
SDRAM Data lines Selftest.................................OK!
SDRAM Address lines Selftest..............................OK!
SDRAM fast selftest.......................................OK!
Please check LEDs.....................LEDs selftest finished!
CPLD selftest.............................................OK!
FPGA selftest.............................................OK!
The switch Mac address is .....................0020.4C6A.CF04
Press Ctrl+B to enter Boot Menu...
The contents displayed on the terminal can vary with different versions of Boot
ROM.
If you press Ctrl+B immediately, the system displays the Boot Menu. If you do not
press Ctrl+B, the system initiates the program decompression process. At this time
if you want to access the BOOT Menu, you must reboot the switch.
Press Ctrl+B. The system displays:
Initialize flash file system. Please wait!
Password :
Enter the BootROM password. After entering the correct password (no password
is set for the switch by default), the system will access the BOOT Menu:
Boot Menu
1: Download application file to flash
2: Select application file to boot
3: Display all files in flash
4: Delete file from flash
5: Modify bootrom password
0: Reboot
Enter your choice(0-5):
CAUTION: While using the switch, please keep in mind the modified BOOTROM
password.
Page 61
5
MAINTAINING HARDWARE
This chapter covers the following topics:
■ Replacing a Power Module
■ Replacing a Power Supply
■ Replacing I/O Modules
■ Replacing the Fan Assembly
The procedures in this chapter should be performed by trained service personnel
only.
Replacing a Power Module
Removing the AC Power
Module
Installing the AC Power
Module
To replace a power module, you need:
■ An antistatic wrist strap
■ A screwdriver
WARNING: Insure that the switch is powered off before removing or installing a
power module.
To remove the power module, do the following:
1 Power off the Switch 7750.
2 Remove the power cord from both the power module and the AC power socket.
3 Loosen the retaining screw that secures the power supply on the lower right front
of the power supply.
4 Remove the power supplies approximately 2 inches (5 cm) from the chassis to
disconnect the power supply AC connectors from the AC power module.
5 Loosen and remove the 4 screws at the corners of the power module.
6 Remove the power module from the chassis.
To install the new power module, do the following:
1 Slide the replacement power module into the power module slot in the bottom
rear of the chassis.
2 Insert and tighten the 4 screws at the corners of the power module.
3 Reconnect the power supplies to the power module.
4 Tighten the retaining screw on the lower right front of the power supply.
5 Connect 2 power cords to the power module.
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62 CHAPTER 5: MAINTAINING HARDWARE
6 Connect the power cords to separate AC power sources on separate power grids
or to a UPS/backup power system.
WARNING: Do not power on the switch until you reconnect all the components.
Replacing a Power Supply
To replace a power supply, you need:
■ An antistatic wrist strap
■ A screwdriver
WARNING: When installing or replacing the power supply when the power is on,
do not touch any naked wire, terminal, or any other part of the product labeled
Dangerous Voltage. Always wear the antistatic wrist strap when replacing the
supply.
Use the following steps to replace a power supply:
1 Loosen the captive screws in the supply that you want to replace.
2 Support the power supply you are removing with one hand and gently pull the
handle with the other hand until it slides out of the slot.
3 If you are not going to install another power supply in this slot, install a blanking
plate on the chassis for dust-proofing and heat dissipation.
4 Remove the new power supply from the package and check the input mode.
5 Support the power supply in one hand and hold the handle with another hand.
Align the supply with the guides in the chassis and slide the supply gently into the
slot.
CAUTION: As you are inserting the power supply, if the pin terminal springs up,
the pin cannot be seated into the hole and the system will sound an alarm. If the
power supply has not been inserted properly, you should slide it out and insert it
again to avoid breaking or cracking the power terminals.
6 Fasten the captive screws.
CAUTION: If the captive screws cannot be fastened, the power supply may not
have been properly seated. Remove and replace the supply.
Over time, the filter on the power supply accumulates dust, which interferes with
the heat dissipation of the chassis. It is important to periodically clean the filter as
described below:
1 Remove the gauze filter by gently pulling it from the front of the power supply.
2 Take the filter to a fresh water supply and clean it.
3 Leave the filter to dry. Do not use heat to dry the filter as this may cause it to
distort.
4 When the filter is completely dry, gently push it back into the front of the power
module.
CAUTION: Do not clean the filter while it is in position at the front of the power
supply. Attempts to do so could result in damage to the equipment or severe
electrical shock.
Page 63
Replacing I/O Modules To replace an I/O module, you need:
■ An antistatic wrist strap
■ A Screwdriver
To remove a module:
1 Remove all the cables from the module to be removed.
2 Loosen the captive screws.
3 Hold the ejector levers on the module with both hands, and press them toward
both sides to separate the connectors of the module from the motherboard.
4 Gently slide the module along the guides and out of the slot.
5 Put the removed module into the package that contained the replacement
module.
Replace the blanking plate on the chassis if you do not install a new module in the
place where the old one was removed.
To install a replacement module:
Replacing I/O Modules 63
Replacing the Fan Assembly
1 With both hands, hold the ejector levers on the module that will be installed.
2 Align the module with the guides in the chassis and slide it into the slot gently
until you feel the positioning pin on the handle bar touch the hole in the chassis.
3 Press the ejector levers inward and seat the pin on the handle bar into the
positioning hole in the chassis.
4 Fasten the captive screws to fix the module.
You can hot-swap fan assemblies in the Switch 7750.
To replace a fan assembly, you need:
■ An antistatic wrist strap
■ A Screwdriver
WARNING: To avoid injury, do not touch any naked wire, terminal, or any part of
the product labeled Dangerous Voltage. Always wear the antistatic wrist strap
when replacing the fan module.
To replace a fan assembly:
1 Put on the antistatic wrist strap.
2 With both hands, pull out the ejector levers on the fan assembly to separate the
fan assembly connector from the backplane.
3 Pull the fan gently along the guides of the slot to remove it.
4 With both hands, pull out the ejector levers of the fan that will be installed. Align
it with the guides in the chassis and slide it gently into the slot until you feel the
positioning pin on the handle bar touch the hole in the chassis.
5 Press the ejector levers inward and seat the pin on the handle bar into the
positioning hole in the chassis.
Page 64
64 CHAPTER 5: MAINTAINING HARDWARE
WARNING: If the fan fails, replace it with a new one without delay before
operating the Switch 7750. Failure to do so will cause the switch to overheat.
Page 65
6
TROUBLESHOOTING
This chapter covers the following topics:
■ Troubleshooting the Configuration
■ Troubleshooting Power
■ Troubleshooting the Fan
■ Troubleshooting the Modules
The simplest way to diagnose a fault is to check the system status LEDs on the
Fabric modules. In addition, with the DeviceMgr network management system,
you can also locate the fault through management software.
Troubleshooting the Configuration
No information is
displayed on the
terminal
The display characters
are illegible
Troubleshooting Power
After the switch is powered on, booting information is displayed on the
configuration terminal. If the configuration system has failed, there is no screen
display at the configuration terminal or the displayed characters are illegible.
If there is no information displayed on the terminal after the Switch 7750 is
powered on, check that:
■ The power system is working normally.
■ The Fabric is working normally.
■ The console cable has been connected to the console port in the Fabric.
If this procedure does not reveal the problem, verify that the console cable is
properly connected and that the configuration terminal is set correctly.
If the displayed characters are illegible, the parameters of configuration terminal
may not have been set correctly. See
If the Power OK LED is off, there may be something wrong with the system power
supply. Check that:
■ The power module has been installed in the correct position to ensure normal
communication with the backplane.
Setting Terminal Parameters on page 45.
■ The switch power has been turned on.
■ The power cord is connected properly.
■ The source voltage is correct.
Page 66
66 CHAPTER 6: TROUBLESHOOTING
Ta bl e 44 describes power LEDs on the Fabric. (continued)
Ta bl e 44 Power LEDs on the Fabric
LED Status Description
OK On — The power is working normally.
Off — The power has failed or has not been installed.
FAIL On — The power has failed.
Off — The power is working normally or has not been installed.
Troubleshooting the Fan
Troubleshooting the Modules
If the fan OK LED is off, check that:
■ The fan has been installed in the correct position for normal communication
with the backplane.
■ Every heat dissipation fan is working normally.
■ There is nothing blocking the vent of the chassis.
■ The blanking plates are installed on the chassis where no module is inserted.
Ta bl e 45 describes fan LEDs on the Fabric.
Ta bl e 45 Fan LEDs on the Fabric
LED Status Description
OK On — The fan is working normally.
Off — The fan has failed or has not been installed.
FAIL On — The fan has failed.
Off — The fan is working or has not been installed
The Fabric and I/O module LEDs show the status of the FABRIC and the I/O
modules, as described in
■ If the ALM LED of the module remains green or green flashing, it indicates
Ta bl e 46.
there is something wrong with the module.
■ During the process of resetting the module, the ALM LED remains on. After
normal booting, it is off.
■ When resetting the module, if the ALM LED remains off, the module may not
be connected to the power source. Verify that the module has been properly
installed in the correct position.
Ta bl e 46 Module LEDs on the Fabric
LED Status Description
RUN Green/Off — The module has failed or has not been inserted.
Green flashing — The module is working normally.
ALM Off — The module is working or has not been inserted.
Green or green flashing— The module has failed.
Page 67
SWITCH 7750 CABLES
Enlarged A side
DB25 Female
8P8C Plug
Enlarged B side
DB9 Female
Enlarged C side
A
This appendix covers the following types of cables and connectors:
■ Console Cable
■ AUX Cable
■ Electrical Port Connector
■ Optical Fiber Cable Connectors
Console Cable Figure 39 illustrates the console cable and connectors.
Figure 39 The Console cable
Enlarged A side
DB25 Female
8P8C Plug
DB9 Female
Ta bl e 47 lists console cable pin-outs.
Ta bl e 47 Console Cable Pin-outs
RJ-45 Signal Direction DB-25 DB-9
1 RTS <---- 4 7
2 DTR <---- 20 4
3 TXD <---- 2 3
4 CD ---> 8 1
5 GND ---- 7 5
6 RXD ---> 3 2
7 DSR ---> 6 6
8 CTS ---> 5 8
Enlarged B side
Enlarged C side
AUX Cable Figure 40 illustrates the AUX cable.
Page 68
68 APPENDIX A: SWITCH 7750 CABLES
Enlarged B side
Enlarged A side
Enlarged C side
DB25 Male
Label
DB9Male
8P8C Plug
Figure 40 The AUX Cable
Enlarged A side
DB25 Male
Label
8P8C Plug
DB9Male
Ta bl e 48 lists the AUX cable pin-outs.
Ta bl e 48 AUX Cable Pin-outs
RJ-45 Signal Direction DB-25 DB-9
1 RTS ---> 4 7
2 DTR ---> 20 4
3 TXD ---> 2 3
4 CD <--- 8 1
5 GND --- 7 5
6 RXD <--- 3 2
7 DSR <--- 6 6
8 CTS <--- 5 8
Enlarged B side
Enlarged C side
Electrical Port Connector
Figure 41 illustrates the RJ-45 connector.
Figure 41 The RJ-45 Connector
PIN #8
PIN #1
Ta bl e 49 lists RJ-45 MDI port pin-outs.
Ta bl e 49 RJ-45 MDI Port Pin-outs
Pinout 10BASE-T/100BASE-TX 1000BASE-T
1 Tx+ Send data BIDA+ Send data to direction A
2 Tx- Send data BIDA- Receive data from direction A
Signal Function Signal Function
Page 69
Optical Fiber Cable Connectors 69
Table 49 RJ-45 MDI Port Pin-outs (continued)
Pinout 10BASE-T/100BASE-TX 1000BASE-T
3 Rx+ Receive data BIDB+ Send data to direction B
4 Reserved - BIDC+ Receive data from direction C
5 Reserved - BIDC- Send data to direction C
6 Rx- Receive data BIDB- Receive data from direction B
7 Reserved - BIDD+ Send data to direction D
8 Reserved - BIDD- Receive data from direction D
Tx = Send data Rx = Receive data BI = I-directional data.
Ta bl e 50 lists RJ-45 MDI-X Port Pin-outs.
Ta bl e 50 RJ-45 MDI-X Port Pinouts
Pinout 10BASE-T/100 BASE-TX 1000BASE-T
Signal Function Signal Function
1 Rx+ Receive data BIDB+ Send data to direction B
2 Rx- Receive data BIDB- Receive data from direction B
3 Tx+ Send data BIDA+ Send data to direction A
4 Reserved - BIDD+ Receive data from direction D
5 Reserved - BIDD- Send data to direction D
6 Tx- Send data BIDA- Receive data from direction A
7 Reserved - BIDC+ Send data to direction C
8 Reserved - BIDC- Receive data from direction C
Optical Fiber Cable Connectors
Figure 42 illustrates the SC optical fiber cable connector.
Figure 42 SC Optical Fiber Connector
Page 70
70 APPENDIX A: SWITCH 7750 CABLES
Figure 43. illustrates the MT-RJ fiber optic cable connector.
Figure 43 The MT-RJ Fiber Connector
Figure 44 illustrates the LC connector.
Figure 44 LC Connector
Page 71
OBTAINING SUPPORT FOR YOUR
B
Register Your Product to Gain Service Benefits
Purchase Value-Added Services
SWITCH
To take advantage of warranty and other service benefits, you must first register
your product at
on accounts that you create or have authorization to access. First time users must
apply for a user name and password that provides access to a number of eSupport
features including Product Registration, Repair Services, and Service Request.
To enhance response times or extend warranty benefits, contact 3Com or your
authorized 3Com reseller. Value-added services can include 24x7 telephone
technical support, software upgrades, onsite assistance or advance hardware
replacement. Experienced engineers are available to manage your installation with
minimal disruption to your network. Expert assessment and implementation
services are offered to fill resource gaps and ensure the success of your networking
projects. More information on 3Com Extended Warranty and Professional Services
is available at
Contact your authorized 3Com reseller or 3Com for additional product and
support information.
http://eSupport.3com.com/. 3Com eSupport services are based
http://www.3com.com/
Troubleshoot Online You will find support tools posted on the 3Com web site at
http://www.3com.com/
■ 3Com Knowledgebase helps you troubleshoot 3Com products. This
http://knowledgebase.3com.com
Access Software Downloads
query-based interactive tool is located at
and contains thousands of technical solutions written by 3Com support
engineers.
■ Connection Assistant helps you install, configure and troubleshoot 3Com
desktop and server NICs, wireless cards and Bluetooth devices. This diagnostic
software is located at:
http://www.3com.com/prodforms/software/connection_assistant/ca_th
ankyou.html
Software Updates are the bug fix / maintenance releases for the version of
software initially purchased with the product. In order to access these Software
Updates you must first register your product on the 3Com web site at
http://eSupport.3com.com/.
First time users will need to apply for a user name and password. A link to
software downloads can be found at
Product Support heading at
http://www.3com.com/.
http://eSupport.3com.com/, or under the
Page 72
72 APPENDIX B: OBTAINING SUPPORT FOR YOUR SWITCH
Software Upgrades are the software releases that follow the software version
included with your original product. In order to access upgrades and related
documentation you must first purchase a service contract from 3Com or your
reseller.
Contact Us 3Com offers telephone, e-mail and internet access to technical support and repair
services. To access these services for your region, use the appropriate telephone
number, URL or e-mail address from the list below. You will find a current directory
of support telephone numbers posted on the 3Com web site at
http://csoweb4.3com.com/contactus/
Telephone Technical Support and Repair
To obtain telephone support as part of your warranty and other service benefits,
you must first register your product at
http://eSupport.3com.com/
When you contact 3Com for assistance, please have the following information
ready:
■ Product model name, part number, and serial number
■ A list of system hardware and software, including revision level
■ Diagnostic error messages
■ Details about recent configuration changes, if applicable
To send a product directly to 3Com for repair, you must first obtain a return
authorization number (RMA). Products sent to 3Com, without authorization
numbers clearly marked on the outside of the package, will be returned to the
sender unopened, at the sender’s expense. If your product is registered and under
warranty, you can obtain an RMA number online at
http://eSupport.3com.com/. First time users will need to apply for a user name
and password.
Telephone numbers are correct at the time of publication. Find a current directory
of support telephone numbers posted on the 3Com web site at
http://csoweb4.3com.com/contactus/
Country Telephone Number Country Telephone Number
Asia, Pacific Rim Telephone Technical Support and Repair
Australia
Hong Kong
India
Indonesia
Japan
Malaysia
New Zealand
Pakistan
You can also obtain support in this region using the following e-mail: apr_technical_support@3com.com
Or request a repair authorization number (RMA) by fax using this number: + 65 543 6348
1 800 678 515
800 933 486
+61 2 9424 5179 or
000800 650 1111
001 803 61009
00531 616 439 or
03 5977 7991
1800 801 777
0800 446 398
+61 2 9937 5083
Philippines
P.R. of China
Singapore
S. Korea
Taiwan
Thailand
1235 61 266 2602 or
1800 1 888 9469
10800 61 00137 or
021 6350 1590 or
00800 0638 3266
800 6161 463
080 333 3308
00801 611 261
001 800 611 2000
Page 73
Telephone Technical Support and Repair 73
Country Telephone Number Country Telephone Number
Europe, Middle East, and Africa Telephone Technical Support and Repair
From anywhere in these
regions, call:
From the following countries, you may use the numbers shown:
Austria
Belgium
Denmark
Finland
France
Germany
Hungary
Ireland
Israel
Italy
You can also obtain support in this region using the following URL: http://emea.3com.com/support/email.html
Latin America Telephone Technical Support and Repair
Antigua
Argentina
Aruba
Bahamas
Barbados
Belize
Bermuda
Bonaire
Brazil
Cayman
Chile
Colombia
Costa Rica
Curacao
Ecuador
Dominican Republic
You can also obtain support in this region using the following:
Spanish speakers, enter the URL:
http://lat.3com.com/lat/support/form.html
Portuguese speakers, enter the URL:
http://lat.3com.com/br/support/form.html
English speakers in Latin America should send e-mail to:
lat_support_anc@3com.com
+44 (0)1442 435529
01 7956 7124
070 700 770
7010 7289
01080 2783
0825 809 622
01805 404 747
06800 12813
01407 3387
1800 945 3794
199 161346
1 800 988 2112
0 810 444 3COM
1 800 998 2112
1 800 998 2112
1 800 998 2112
52 5 201 0010
1 800 998 2112
1 800 998 2112
0800 13 3COM
1 800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
1 800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
Luxembourg
Netherlands
Norway
Poland
Portugal
South Africa
Spain
Sweden
Switzerland
U.K.
Guatemala
Haiti
Honduras
Jamaica
Martinique
Mexico
Nicaragua
Panama
Paraguay
Peru
Puerto Rico
Salvador
Trinidad and Tobago
Uruguay
Venezuela
Virgin Islands
342 0808128
0900 777 7737
815 33 047
00800 441 1357
707 200 123
0800 995 014
9 021 60455
07711 14453
08488 50112
0870 241 3901
AT&T +800 998 2112
57 1 657 0888
AT&T +800 998 2112
1 800 998 2112
571 657 0888
01 800 849CARE
AT&T +800 998 2112
AT&T +800 998 2112
54 11 4894 1888
AT&T +800 998 2112
1 800 998 2112
AT&T +800 998 2112
1 800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
57 1 657 0888
US and Canada Telephone Technical Support and Repair
1 800 876 3266
Page 74
74 APPENDIX B: OBTAINING SUPPORT FOR YOUR SWITCH
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