Digi 90031300 User Manual
Digi International Inc.
AccelePort
T1 Modem Bank
Installation and Configuration Guide
Part No: 90031300 Rev C
The Digi logo is a registered trademark of Digi International Inc.
™
AccelePort
, T1 Modem Bank™ and EPC/X™ are trademarks of Digi International Inc. All other brand and product
names are the trademarks of their respective holders.
© Digi International Inc. 1997
All Rights Reserved
Information in this document is subject to change without notice and does not represent a commitment on the part of
Digi International.
Digi provides this document “as is”, without warranty of any kind, either expressed or implied, including, but not
limited to, the implied warranties of fitness or merchantability for a particular purpose. Digi may make improvements and/or changes in this manual or in the product(s) and/or the program(s) described in this manual at any time.
This product could include technical inaccuracies or typographical errors. Changes are periodically made to the
information herein; these changes may be incorporated in new editions of the publication.
Table of Contents
Regulatory Statements................................................................................................................................................. viii
Federal Communications Commission (FCC) Statement .................................................................................... viii
FCC Part 68............................................................................................................................................................ ix
Industry Canada Compliance Statement ..................................................................................................................x
AccelePort T1 Modem Bank Overview..........................................................................................................................1
Unpacking ................................................................................................................................................................2
Planning the T1 WAN Interface......................................................................................................................................3
Connections to the WAN .........................................................................................................................................3
Carrier Approval...............................................................................................................................................3
CSU Mode.........................................................................................................................................................3
Line Build Out ..................................................................................................................................................4
CSU Specification.............................................................................................................................................4
T1 Cable Specification......................................................................................................................................4
Parameters Specified to the Carrier ..................................................................................................................5
Planning Worksheets................................................................................................................................................6
General Information..........................................................................................................................................6
Hardware Installation ......................................................................................................................................................8
T1 Modem Bank Power Supply Installation/Replacement......................................................................................8
T1 Modem Bank Standalone or Rack Installation.................................................................................................10
Standalone Installation Procedure...................................................................................................................11
Requirements for Rack Installations...............................................................................................................12
Mounting Bracket Installation for a 24-inch Rack ..................................................................................12
General Rack Installation Directions.......................................................................................................14
Daisy Chaining T1 Modem Bank Units.................................................................................................................16
Daisy Chain Example......................................................................................................................................17
Connecting a Modem......................................................................................................................................18
Daisy Chaining T1 Modem Bank Units and EPC/CON-16 Concentrators ....................................................19
Fault Tolerance ...............................................................................................................................................19
EPC/X Host Adapter Installation...........................................................................................................................20
PCI Host Adapters ..........................................................................................................................................20
Configuring the Host Adapter..................................................................................................................20
Installing the PCI Host Adapter in your Computer .................................................................................20
ISA Host Adapters..........................................................................................................................................21
Setting the I/O Port Address....................................................................................................................21
Factory-Set Jumper J1 .............................................................................................................................22
Installing the ISA Host Adapter in your Computer.................................................................................22
EISA Host Adapters........................................................................................................................................23
Factory-Set Jumpers ................................................................................................................................23
Installing the EISA Host Adapter in your Computer...............................................................................23
System Configuration..............................................................................................................................23
Connecting the EPC/X Host Adapter to the T1 Modem Banks.............................................................................25
Software Installation and Configuration .......................................................................................................................27
Setting the Node Number.......................................................................................................................................27
Installing Download...............................................................................................................................................29
POST Failure..........................................................................................................................................................30
Possible Problem.............................................................................................................................................31
Restarting POST .............................................................................................................................................31
Display Panel Status Indicators.......................................................................................................................31
Contents iii
Software Installation for Novell Systems...............................................................................................................34
Introduction.....................................................................................................................................................34
Installing the EPC/X AIO Device Driver .......................................................................................................35
Installing the AIO Application........................................................................................................................35
Installing SNMP..............................................................................................................................................35
Installing QuickManager.................................................................................................................................35
Configuring the T1 Modem Banks .................................................................................................................36
Software Installation for Windows NT Systems....................................................................................................38
Installing the EPC/X Windows NT Device Driver.........................................................................................38
Installing the Windows NT SNMP Service....................................................................................................38
Windows NT 3.51....................................................................................................................................38
Windows NT 4.0......................................................................................................................................39
Installing RAS.................................................................................................................................................39
Installing the Management Software ..............................................................................................................39
Host System Installation..........................................................................................................................39
Remote System Installation .....................................................................................................................40
T1 Modem Bank Configuration.............................................................................................................................41
Configuring via QuickManager......................................................................................................................41
Configuring via the Terminal Port..................................................................................................................44
Configuring via the Display Panel..................................................................................................................45
Configuring via the Serial Port Interface........................................................................................................47
Configuration modification......................................................................................................................49
Equipment List.........................................................................................................................................51
System Information..................................................................................................................................52
Modem Switchhook Status......................................................................................................................53
Alarm Status ...........................................................................................................................................54
T1 Modem Bank Diagnostics........................................................................................................................................56
Running Diagnostics with QuickManager.............................................................................................................57
Running Diagnostics from the Display Panel........................................................................................................58
Running Diagnostics from the Terminal Port........................................................................................................59
Diagnostic Test Descriptions .................................................................................................................................62
Test 1: Front Panel Test.................................................................................................................................62
Test 2: RAM Test...........................................................................................................................................62
Test 3: Timer Test..........................................................................................................................................62
Test 4: Line Card Test.....................................................................................................................................63
Test 5: Modem Test .......................................................................................................................................63
Test 6: Sync Internal Loopback Test .............................................................................................................63
Test 7: Sync External Loopback Test............................................................................................................64
Test 8: EEPROM Test ...................................................................................................................................64
Test 9: Watchdog Test ...................................................................................................................................64
Component Removal and Installation ...........................................................................................................................65
Line Card Removal and Replacement....................................................................................................................66
Modem Card Removal and Installation/Replacement............................................................................................68
Modem Card Removal....................................................................................................................................68
Modem Card Installation/Replacement...........................................................................................................71
Power Supply Removal..........................................................................................................................................73
Fan Assembly Removal and Replacement.............................................................................................................75
Fuse Replacement ..................................................................................................................................................76
Connections to the Telephone Network........................................................................................................................77
Alarms on a T1 Span.......................................................................................................................................78
T1 Modem Bank Interaction...........................................................................................................................78
iv T1 Modem Bank
Physical Specifications..................................................................................................................................................79
T1 Modem Bank Power Cord Specifications.........................................................................................................79
T1 Modem Bank Environmental Requirements.....................................................................................................80
T1 Modem Bank Rack Specifications....................................................................................................................80
Standalone Unit Specifications.......................................................................................................................80
Rack Specifications.........................................................................................................................................80
4U 19 Inch Rack System .........................................................................................................................80
4U 24 Inch Rack System .........................................................................................................................80
Daisy Chain Cables................................................................................................................................................81
Terminator Plug .....................................................................................................................................................81
T1 Loop Back Plug ................................................................................................................................................81
T1 Modem Bank Certification ...............................................................................................................................82
Glossary.........................................................................................................................................................................83
Appendix A — Memory Conflicts................................................................................................................................85
Contention for Memory Addresses........................................................................................................................85
ISA Host Adapters..........................................................................................................................................87
Conflicts Between 8-Bit and 16-bit Memory Devices....................................................................................87
EISA Host Adapters........................................................................................................................................88
Appendix B — Transmission Modes............................................................................................................................89
Appendix C — Terminal Port Cable.............................................................................................................................91
Appendix D — Specifications and Wiring Pin Diagrams............................................................................................92
Line Card Connector..............................................................................................................................................92
Connector for Sync Channels.................................................................................................................................93
Terminal Port .........................................................................................................................................................93
Appendix E — Generic T1 Modem Bank Wiring Modes.............................................................................................94
Eight-Wire Direct Wiring ......................................................................................................................................94
Four-Wire Direct Wiring........................................................................................................................................95
Restrictions on Daisy Chain Cable Lengths...........................................................................................................96
Eight-Wire Synchronous Modem Wiring..............................................................................................................97
Appendix F — Modem AT Command Set....................................................................................................................99
Basic AT Commands .............................................................................................................................................99
AT& (Ampersand) Commands .............................................................................................................................105
AT% (Percent) Commands ..................................................................................................................................111
AT\ (Backslash) Commands ................................................................................................................................112
AT- (Dash) Commands........................................................................................................................................116
AT" (Quote) Commands ......................................................................................................................................117
Class 1 FAX Commands......................................................................................................................................118
Class 2 FAX Commands......................................................................................................................................120
Class 2 FAX Responses................................................................................................................................127
S Registers............................................................................................................................................................128
S Register Definitions...................................................................................................................................129
Result Codes.........................................................................................................................................................143
Display Format Options................................................................................................................................143
Extended Message Options...........................................................................................................................144
Negotiation Progress Messages ....................................................................................................................146
Index............................................................................................................................................................................149
Contents v
List of Figures
Figure 1 T1 Modem Bank Chassis, Front View.......................................................................................................1
Figure 2 Power Supply.............................................................................................................................................9
Figure 3 Line Card and Synchronous Cable Connections for Standalone T1 Modem Bank.................................11
Figure 4 Bracket Position For 19-inch Rack..........................................................................................................12
Figure 5 Bracket Position For 24-inch Rack..........................................................................................................13
Figure 6 T1 Modem Bank Unit Spacer..................................................................................................................14
Figure 7 Line Card .................................................................................................................................................15
Figure 8 Synchronous Ports and Terminal Port.....................................................................................................16
Figure 9 Two Daisy Chains of T1 Modem Banks to be Connected Locally .........................................................17
Figure 10 Remote T1 Modem Bank Units...............................................................................................................18
Figure 11 Mixing EPC Concentrators with T1 Modem Bank Units........................................................................19
Figure 12 DIP Switch Settings for I/O Port Address...............................................................................................21
Figure 13 EPC/X Host Adapter Connected Locally to T1 Modem Banks ..............................................................25
Figure 14 Local and Remote T1 Modem Bank Units..............................................................................................26
Figure 15 EPC/X Host Adapter Connected to Concentrators and T1 Modem Bank Units .....................................26
Figure 16 T1 Modem Bank Display Panel...............................................................................................................28
Figure 17 Main Screen.............................................................................................................................................36
Figure 18 T1 Modem Bank Configuration Screen...................................................................................................37
Figure 19 Line Card Status Display.........................................................................................................................42
Figure 20 Line Card Options Display......................................................................................................................43
Figure 21 Modem Test Results ................................................................................................................................57
Figure 22 Line Card .................................................................................................................................................66
Figure 23 Modem Card............................................................................................................................................69
Figure 24 Quick Manager Modem Revision Screen................................................................................................71
Figure 25 Power Supply...........................................................................................................................................74
Figure 26 Fan Assembly ..........................................................................................................................................75
Figure 27 AC Power Inlet ........................................................................................................................................76
Figure 28 T1 Modem Bank and Public Switched Telephone Network ...................................................................77
Figure 29 Functional Block Diagram of the T1 Modem Bank ................................................................................78
Figure 30 Typical PC Memory Usage - 1st Megabyte.............................................................................................86
Figure 31 Simple Terminal Cable............................................................................................................................91
Figure 32 RJ-45 Plug ...............................................................................................................................................92
Figure 33 Eight-Wire Direct Daisy Chain Cable Wiring.........................................................................................94
Figure 34 Four-Wire Direct Daisy Chain Cable Wiring..........................................................................................95
Figure 35 RS-232 Synchronous Modem Cables......................................................................................................97
Figure 36 RS-422 Synchronous Modem Cables......................................................................................................98
vi T1 Modem Bank
List of Tables
Table 1 T1 Modem Bank Shipping Carton Contents..............................................................................................2
Table 2 CSU Technical Description.......................................................................................................................4
Table 3 Requirements for T1 Modem Bank Setup.................................................................................................6
Table 4 Error Message Codes...............................................................................................................................30
Table 5 Display Panel Status Codes .....................................................................................................................32
Table 6 Component Level Troubleshooting.........................................................................................................65
Table 7 Types of Modem Cards............................................................................................................................70
Table 8 Daisy Chain Cable Length vs. Baud Rate................................................................................................96
Table 9 Supported FAX Transmit/Receive Modulations ...................................................................................119
Contents vii
Regulatory Statements
Federal Communications Commission (FCC) Statement
Radio Frequency Interference (RFI)
This equipment generates and uses radio frequency energy, and if not installed and used in strict accordance with
manufacturer’s instructions, may cause interference to radio and television reception. This equipment has been typetested to verify that it complies with the limits for a Class A computing device in accordance with specifications in
Subpart J of Part 15 of FCC Rules (Appendix B of OST Bulletin No. 62), which are designed to provide reasonable
protection against such interference in a residential installation. However, this does not assure that such interference
will not occur in a particular installation. If this equipment does cause interference to radio or television reception,
which can be determined by turning your computer OFF and ON, the user is encouraged to attempt correction of the
interference by one or more of the following measures:
1. Reorient the receiving antenna.
2. Relocate your computer with respect to the receiver.
3. Move your computer away from the receiver.
4. Plug your computer into a different outlet so the computer and receiver are not on the same circuit.
If these measures fail to eliminate the interference, the user should contact either the distributor or an experienced
radio/television technician for further suggestions. The user may also find the following booklet (prepared by the
FCC) helpful:
“How to Identify and Resolve Radio/TV Interference Problems”
This booklet is available from the U.S. Government Printing Office, Washington, DC. Request should be made for
Stock No. 004000003454.
viii T1 Modem Bank
FCC Part 68
FCC Registration: 5TLUSA-23932-DD-N
Ringer Equivalence Number: 0.0B
This T1 Modem Bank complies with Part 68 of FCC Rules. On the back of the T1 Modem Bank is a label that
includes the FCC Registration Number and Ringer Equivalence Number (REN) for this T1 Modem Bank. If
requested, this information must be provided to the telephone company.
The REN is used to determine the number of devices you may connect to your telephone line and still have all of
those devices ring when your number is called. In most, but not all, areas, the sum of the RENs of all devices
connected to one line should not exceed five (5.0). To be certain of the number of devices you may connect to your
line, as determined by the REN, you should contact your local telephone company to determine the maximum REN
for your calling area.
If your T1 Modem Bank interferes with the network, the Telephone Company may discontinue your service
temporarily. If possible, they will notify you in advance. If advance notice isn’t practical, you will be notified as
soon as possible. You will be informed of your right to file a complaint with the FCC.
Your telephone company may make changes in its facilities, equipment, operations or procedures that could affect
the proper function of your T1 Modem Bank. If it does, you will be notified in advance to give you an opportunity to
maintain uninterrupted telephone service.
Problems with your T1 Modem Bank
If you experience trouble with your T1 Modem Bank, please contact Digi Technical Support for information on
obtaining service or repairs. The telephone company may ask you to disconnect the T1 Modem Bank from the
network until the problem has been corrected or you are sure that the equipment is not malfunctioning.
This equipment may not be used with coin-operated telephones. Connection to Party Line Service is subject to state
tariffs.
Regulatory Statements ix
Industry Canada Compliance Statement
This Class A digital apparatus meets the requirements of the Canadian Interference-Causing Equipment Regulations.
It complies with CSA 22.2 No. 950 for safety, ICES 003 for EMC, and ICCS 003 for Telecom.
Cet appareil numérique de la classe A respecte toutes les exigences du
Canada. Cet appareil est conformément aux exigences de CSA 22.2 No. 950 pour la sécurité, ICES 003 pour EMC et
ICCS pour les télécommunications.
Règlement
sur le matériel brouilleur du
x T1 Modem Bank
AccelePort T1 Modem Bank Overview
The Digi AccelePort T1 Modem Bank is a high speed Wide Area Network (WAN) interface for Windows NT and
Novell environments. The T1 Modem Bank system is composed of two major parts: a host-installed Enhanced
Performance Concentrator (EPC/X) adapter and a rack mountable or table top system cabinet. Figure 1 shows a front
view of the T1 Modem Bank system cabinet.
Figure 1 T1 Modem Bank Chassis, Front View
Some versions of the T1 Modem Bank have a second connector on the line card labeled “PBX.”
This connector is non-functional.
The T1 Modem Bank multiplexes up to 24 asynchronous V.34 modems onto one DS-1 (four-wire T1) WAN circuit.
For a discussion of the terms and concepts related to T1 lines and the devices that connect to them, see “Connections
to the Telephone Network” on page 77. The Glossary on page 83 defines the terms and acronyms used in this
manual.
Overview 1
Unpacking
Table 1 documents typical shipment packaging contents of the T1 Modem Bank. The components should be checked
in upon arrival; notify your salesperson if the order is incomplete.
The T1 Modem Bank is shipped with proper shock insulation material. If the unit needs to be shipped, use the
original shipping carton. If the original packaging is unavailable, contact Digi for replacement packaging.
Table 1 T1 Modem Bank Shipping Carton Contents
Description Part Number
The complete system includes:
Carton 1
System unit 50000471-xx
Accessory box 76000205
Power supply 50000468-01
Carton 2
EPC/X Host Adapter ISA EISA PCI
77000146 77000234 77000427
Available additional components:
Power Supply card 76000206
T1 line card 76000207
Modem card 76000208
Fan card 76000209
T1 Modem Bank Installation Guide 90031300
Terminator plug 60000388
2
T1 Modem Bank
Planning the T1 WAN Interface
This section describes planning the T1 Modem Bank interface to the carrier facility. The configuration of the T1
Modem Bank must match the requirements of the T1 line specified by the carrier.
Connections to the WAN
Connection to the telephone carrier facility is handled from the line card, via a T1 line.
Carrier Approval
Contact your carrier for approval before beginning the actual installation. By doing this, you will help to ensure
proper configuration of the line and the T1 Modem Bank. This protects the T1 Modem Bank and telephone network
from damage due to an improper configuration.
After the T1 Modem Bank has been installed on the network, it is good practice to contact the carrier before
removing or disconnecting the T1 Modem Bank. If you disconnect the T1 Modem Bank from the WAN, the carrier
may suspend your T1 service. RJ-45 connectors are available which ensure loopback upon disconnection of user
equipment to ensure that the line from the central office is properly terminated. Most T1 carriers provide a “smart
jack” which will loop the T1 carrier when the T1 Modem Bank is disabled.
CSU Mode
• When the line card is in the CSU mode of operation (also known as “Long Haul”), it supports 6,000 feet of 24
AWG twisted-pair cable.
• In the non-CSU mode of operation (also known as “Short Haul”), the DSX-1 function supports a maximum
cable distance of 655 feet. This mode allows the T1 Line card to interface to PBX devices.
Planning the T1 Interface 3
Line Build Out
After the T1 Modem Bank is installed, the carrier will determine the correct setting for Line Build Out (LBO).
However, certain determinations based on the following information will need to be entered into your computer.
• CSU mode Line compensation: Line attenuation can be set to one of the following: -0.0dB, -7.5dB, -15.0dB,
and -22.5dB. Your T1 installer will inform you of the correct setting.
• DSX-1 Mode Transmit line buildout: For line compensation, your T1 installer will select a cable length
between 0 and 655 feet based upon line length.
CSU Specification
Table 2 CSU Technical Description
Line Frequency 1.544 Mb/s +/- 200 b/s
Line Code AMI or B8ZS
Critical Circuitry Power Source Dry Span, CSU powered form local AC power source
Line Framing D4 or ESF
Line Loopback (LLB) Set Inband Code (00001) repeating binary pattern (per AT&T Pub 54016 and
ANSI T1.403)
Line Loopback (LLB) Reset Inband Code (001) repeating binary pattern (per AT&T Pub 54016 and ANSI
T1.403)
Line Build Out 0.0, -7.5, -15.0, or -22.5 dB of attenuation
Pulse Density and Consecutive Zeros
Enforcement
In accordance with requirements of AT&T Pub 62411
T1 Cable Specification
Transmitting T1 signals requires two 24 AWG stranded unshielded twisted pair Category 5 cables. A 15’ cable
meeting these specifications is shipped with the T1 Modem Bank.
4
T1 Modem Bank
Parameters Specified to the Carrier
Certain parameters are specified to the carrier when provisioning the T1 line.
You will need to provide the following information to a T1 facility provider.
• Individual Access Line Select the Phone service or Line Pooling Arrangement, which is sometimes termed
Multi-Hunt Grouping. With Line Pooling, one phone number is assigned to a group of end terminals, and the
first available terminal will receive the call.
• B8ZS or AMI line code B8ZS is preferred.
• ESF or D4 framing format ESF is preferred because of its enhanced diagnostic and maintenance capabilities.
• Supervisory Signaling Method Robbed bit signaling; ground start, loop start, immediate start, or wink start
• Dual-tone Multi Frequency (DTMF) or pulse-dial addressing DTMF preferred
• Be sure you ask for a “trunk-side” T1. Most carriers will provision “line-side” T1s by default, which will cause
lower speed modem connections.
Planning the T1 Interface 5
Planning Worksheets
The T1 Modem Bank must be configured to match the provisioning of the T1 line from the carrier.
General Information
Required information includes the following:
• The identity of the WAN manager for your local and remote sites
• The identification of the TELCO providing the WAN
Table 3 Requirements for T1 Modem Bank Setup
Requirements Description
Location of the T1 Modem
Bank
Active T1 line One or more active and installed T1 lines from the WAN service with at least two
Ground Start or Loop Start CSU supervision mode
Circuit ID Identifier used by the T1 provider to refer to the line. It refers only to the T1 line and
You can make as many copies as you need of the worksheet on the following page. A copy of this worksheet should
also be filled out for both the local and remote sites.
The T1 Modem Bank must be positioned where it can be connected to the WAN
within the specified cable limits.
channels assigned.
is not associated with individual phone numbers. You must keep track of the circuit
ID number for each line, since if you experience trouble on the T1 line, the service
provider will need to know this number.
6
T1 Modem Bank
T1 Modem Bank Worksheet
Type Number or Checkmark
(√)
Circuit ID # __________________ This is a code assigned by your
service provider, one per T1 line
Lead phone
number
Span Type ________
Frame Format ______
Line
Encoding
Signaling ______
__________________ Master phone number or first phone in
the sequence to receive a call.
________
______
______
______
______
Description
Long Haul
Short Haul
ESF
D4
B8ZS
AMI
Ground Start
Loop Start
Attenuation
EQ Gain
(applicable
only for Long
Haul)
______
______
______
______
______
______
______
Wink Start
Immediate Start
Line Build-out:
0.0 dB
-7.5 dB
-15.0 dB
-22.5 dB
Short haul distance:
0 - 655 ft.
Low
High
Planning the T1 Interface 7
Hardware Installation
This section describes the following procedures:
1. T1 Modem Bank power supply installation/replacement
2. T1 Modem Bank standalone or rack installation
3. T1 Modem Bank daisy chaining
4. EPC/X host adapter installation
5. EPC/X host adapter connection to the T1 Modem Bank units.
T1 Modem Bank Power Supply Installation/Replacement
The T1 Modem Bank operates with either a single power supply installed or with two power supplies installed. Dual
power supplies allow a T1 Modem Bank to share load balancing so that one power supply can take over if the other
power supply becomes inoperable. To install a power supply (or supplies) into a new T1 Modem Bank unit, or to
replace or add a power supply in an existing T1 Modem Bank unit, follow the directions in this section. See “Power
Supply Removal” on page 73 if you need instructions for removing a power supply from a T1 Modem Bank.
8
T1 Modem Bank
Figure 2 Power Supply
You can install a second power supply into a T1 Modem Bank that already has an existing
•
power supply installed without having to power-down the T1 Modem Bank.
Wear a grounding strap while performing this procedure to prevent electrical discharge.
•
Avoid touching the fan during this procedure since the fan blade could cause harm.
•
When handling the power supply printed circuit board, do not touch the edge connector that
•
connects to the distribution board because damage to the board may result.
1. If the display panel faceplate on the T1 Modem Bank is closed, loosen the two captive screws on the display
panel faceplate; carefully pull down the hinged display panel faceplate.
2. Slide the power supply into an available slot. It may be necessary to apply some force to properly seat the power
supply.
3. Use the ON/OFF switch at the back of the T1 Modem Bank to power it up if it is not already powered-up. If you
installed a second power supply into a unit while the unit was powered-up, no reset is needed because hot swap
capabilities are integrated on power supplies.
4. It may take a few seconds for the LED on the power supply board to light to indicate that the power supply is
operational.
Hardware Installation 9
T1 Modem Bank Standalone or Rack Installation
You have the option of using the T1 Modem Bank in a standalone, table-top configuration or in a rack-mounted
configuration. Directions for both configurations are provided in this section.
• Make sure the T1 Modem Bank is powered-down before you install it.
• Do not block the sides of the T1 Modem Bank since this will impede airflow.
• The T1 Modem Bank is shipped from the factory with four “feet” installed on the bottom of
the unit. If you remove the feet, you must ensure that the T1 Modem Bank will have at least
1U (1.75 inches) of clearance beneath it in order to prevent airflow from being impeded.
10
T1 Modem Bank
Standalone Installation Procedure
Tools needed: Phillips screwdriver; flat blade screwdriver
1. Place the T1 Modem Bank on a flat surface within 6’ 7” (2m) of a power outlet.
2. Attach the terminator plug to the connector labeled HOST OUT on the HOST IN/OUT and Terminal faceplate.
See Figure 3.
3. Plug the power cord into an outlet.
5. Insert the RJ-45 plug on the T1 line cable into the jack marked T1 on the Line card faceplate. See Figure 3.
6. Refer now to the instructions in “EPC/X Host Adapter Installation” on page 19.
Figure 3 Line Card and Synchronous Cable Connections for Standalone T1 Modem Bank
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Hardware Installation 11
Requirements for Rack Installations
The T1 Modem Bank chassis is made to be inserted into a standard 19-inch or a 24-inch equipment rack. The T1
Modem Bank is shipped from the factory with two rack-mounting brackets (“ears”) installed for a 19-inch rack. If
you wish to install a T1 Modem Bank into a 19-inch rack, go now to the instructions in “General Rack Installation
Directions” on page 14. Before you can install a T1 Modem Bank into a 24-inch rack, you must first remove the
rack-mounting brackets and then re-install them in the correct position for a 24-inch rack.
Mounting Bracket Installation for a 24-inch Rack
Tools needed: Phillips screwdriver; flat blade screwdriver
1. The rack-mounting brackets must be removed from their 19-inch rack position. Remove the three screws that
fasten each of the brackets to the chassis. (See Figure 4).
Figure 4 Bracket Position For 19-inch Rack
2. Re-install the brackets so that the long sides of the brackets extend outward from the chassis; the shorter sides of
the brackets must be flat against the sides of the chassis as shown in Figure 5.
12
T1 Modem Bank
3. Line up the circular holes in a bracket with the circular holes on a side of the T1 Modem Bank, and use two of
the screws to fasten the bracket to the chassis.
Do not use the oval slots on a bracket to connect the bracket to the T1 Modem Bank.
Figure 5 Bracket Position For 24-inch Rack
4. Follow “General Rack Installation Directions” on page 14 when you have installed two brackets to each T1
Modem Bank unit.
Hardware Installation 13
General Rack Installation Directions
• When multiple units will be mounted in the rack, install a T1 Modem Bank unit in
the first chassis slot at the bottom of the rack, then work upward. This prevents
cables from becoming tangled, and it maintains the lowest possible center of gravity
to prevent the rack from falling over.
• Multiple T1 Modem Bank units within the confined space of a rack may cause
higher operating temperatures. The recommended maximum external ambient
operating temperature of a T1 Modem Bank unit is 40° C. Since the T1 Modem
Bank takes in air from the vent on the bottom of the unit and exhausts the air out
the vent on the side, make sure that neither vent is blocked. The T1 Modem Bank is
shipped from the factory with four “feet” installed on the bottom of the unit. If you
remove the feet, you must ensure that each T1 Modem Bank will have at least 1U
(1.75 inches) of clearance beneath it in order to prevent airflow from being
impeded. You may connect a Digi-supplied spacer (See Figure 6) to the rack
between each T1 Modem Bank unit in order to ensure the required clearance. In
general, eight T1 Modem Bank units can be stacked in a six-foot rack; five units
can be stacked in a 4-foot rack.
• The power cord is limited to 6’ 7” (or 2 m) in length. This is sufficient since most
racks provide internal power outlets.
• The T1 Modem Bank is rated at 1.2 Amps when the current is drawn from a 125 V
AC supply. Due to the nature of the internal switching power supply, the power
rating of the AC supply circuit should be derated to 75% of its rated capacity when
calculating how many units can be connected to the AC supply. For example, a 15
Amp circuit should be derated to 11.25 Amps.
• The T1 Modem Bank should be used only with earth grounded outlets. The earth
ground connection of the three prong cord should be maintained even when the unit
is not connected directly to the AC supply line through a power strip.
Figure 6 T1 Modem Bank Unit Spacer
14
T1 Modem Bank
1. Installing the T1 Modem Bank into the rack requires two people since the T1 Modem Bank is heavy. Note that
handles are provided on the T1 Modem Bank to aid in rack installation. They are part of the chassis and are
located on the front of the T1 Modem Bank near the outer edges of the chassis. As one person holds the chassis
in the appropriate location in the rack, the other person must ensure that
all
the oval slots on the rack-mounting
brackets line up with the correct holes in the rack before fastening the chassis to the rack with the screws
provided. Tighten all the screws with a screwdriver.
2. Repeat step 1 to install other T1 Modem Bank units in the rack.
3. Plug the power cord of each T1 Modem Bank into an outlet.
4. Insert the RJ-45 plug from the T1 line cable into the T1 jack on the Line card faceplate for each T1 Modem
Bank and label the cable. (See Figure 7). A suggested method of labeling is to label each T1 line alphabetically,
starting from the top.
5. Refer to the next section, “Daisy Chaining T1 Modem Bank Units.”
Figure 7 Line Card
3:5
7
Hardware Installation 15
Daisy Chaining T1 Modem Bank Units
The HOST OUT connector of each unit must be connected to the HOST IN connector of the next unit in the daisy
chain. A terminator plug is then installed on the HOST OUT connector of the last unit in the daisy chain. See Figure
8.
Figure 8 Synchronous Ports and Terminal Port
16
T1 Modem Bank
Daisy Chain Example
While setting up daisy chains, refer to the example shown in Figure 9 and the directions that follow.
Figure 9 Two Daisy Chains of T1 Modem Banks to be Connected Locally
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You can connect whatever number of T1 Modem Bank units you want in each of 2 daisy chains,
as long as the total number of units in both daisy chains does not exceed 7 for each EPC/X host
adapter that will be installed in your computer. For example, all 7 of the units in Figure 9 could
be connected in one daisy chain, and there would be no units in the second daisy chain.
1. Use daisy chain cables to connect the HOST OUT port of each T1 Modem Bank to the HOST IN port of the T1
Modem Bank which is next in the chain.
2. Connect the terminator plug to HOST OUT on the last T1 Modem Bank in the rack to allow loopback to the
motherboard.
3. Label and secure all cables.
Hardware Installation 17
• Do not connect wires to pins 12 or 13 in a standard daisy chain cable—serious damage
could result.
• Never use VGA extension cable or any other cable that has all 15 pins wired.
• Do not use a standard DB15 video cable
• To build a custom daisy chain cable, follow the wiring mode shown in Figure 33 on page
94 or Figure 34 on page 95. Alternatively, contact your Digi sales representative.
Connecting a Modem
To connect a modem to T1 Modem Banks, use the cabling shown in Figure 35 (page 97) or Figure 36 (page 98),
depending upon your modem type (RS-232 or RS-422). Connect additional T1 Modem Bank units with Eight-Wire
Direct cables (or the standard daisy chain cables shipped with the unit) as shown in Figure 10. Be sure to install the
terminator plug on the HOST OUT port of the last T1 Modem Bank.
Figure 10 Remote T1 Modem Bank Units
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18
T1 Modem Bank
Daisy Chaining T1 Modem Bank Units and EPC/CON-16 Concentrators
A T1 Modem Bank can be installed in an existing system comprised of EPC/CON-16 concentrators. See Figure 11.
• Because existing EPC concentrators are assigned node numbers by the host each time the
Figure 11 Mixing EPC Concentrators with T1 Modem Bank Units
software is booted, any added T1 Modem Bank units must follow the EPC concentrators in
the daisy chain.
• The last T1 Modem Bank in a daisy chain must have a terminator plug installed on its
HOST OUT port. Individual T1 Modem Bank units are not shipped with terminator plugs.
Terminator plugs are shipped with EPC/X host adapters only.
• All EPC concentrators which will be connected to the EPC/X host adapter via synchronous
modems must be of the newer type (plastic) if a T1 Modem Bank is to be added to the
system.
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Fault Tolerance
T1 Modem Bank units are assigned physical node numbers (set by the operator during installation—see page 27).
The node number is used to route data to and from a specific T1 Modem Bank unit. If a particular T1 Modem Bank
is turned off or removed from the daisy chain, the 24 channels on that T1 Modem Bank become unavailable to the
system, but the rest of the system remains unaffected. Since the T1 Modem Bank unit’s HOST IN and HOST OUT
ports are of the opposite gender, a T1 Modem Bank can be removed from the middle of a daisy chain, and the cables
can be connected so that the chain remains unbroken. To remove the last T1 Modem Bank unit, simply plug a
terminator plug into the end of the daisy chain cable.
When the hook-up is complete, go to “EPC/X Host Adapter Installation” on page 19 for further instructions.
Hardware Installation 19
EPC/X Host Adapter Installation
The Digi EPC/X host adapter is an intelligent dual-channel synchronous communication board which plugs into a
slot in your computer’s bus. The adapter provides an interface between the computer and a single T1 Modem Bank
or a series of daisy-chained T1 Modem Banks and/or EPC concentrators.
Before installing your Digi EPC/X host adapter, be sure to write down its serial number.
PCI Host Adapters
Configuring the Host Adapter
No hardware configuration is required for PCI host adapters.
Installing the PCI Host Adapter in your Computer
1. Turn off your computer’s power and remove the cover. Refer to your computer’s manual for instructions on
cover removal and option board installation and cautions.
2. Locate an available PCI slot in your computer and remove the slot plate.
3. Plug the host adapter into the PCI slot and screw the endplate to the computer chassis.
4. Replace your computer’s cover.
PCI EPC/X host adapters are shipped with a diagnostic diskette. The MS-DOS based diagnostic
program, UD-PCI.EXE, will help verify correct installation of the host adapter, and help
identify possible hardware problems. See the text file, USERPCI.TXT, for complete
instructions, and RELNOT-P.TXT for release information.
5. When you have verified that the host adapter has been correctly installed, follow the instructions in “Connecting
the EPC/X Host Adapter to the T1 Modem Banks” on page 25.
20
T1 Modem Bank
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