Patton electronic 2720-I User Manual
USER
MANUAL
MODEL 2720/I
T1/Fractional T1 CSU/DSU
with Ethernet Bridging
An ISO-9001
Certified Company
Part# 07M2720I-UM
Doc# 08618U2-001,
Rev. C
Revised 10/05/07
SALES OFFICE
(301) 975-1000
TECHNICAL SUPPORT
(301) 975-1007
http://www.patton.com
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TABLE OF CONTENTS
Section
Page
1.0 Warranty Information .............................................................2
1.1 Warranty Statement
1.2 Radio and TV Interference
1.3 Industry Canada Notice
1.4 FCC Compliance
1.5 Service Information
2.0 General Information...............................................................5
2.1 Features
2.2 General Product Description
3.0 PPP Operational Background................................................6
3.1 Application
3.2 Configuration
4.0 Installation ..........................................................................31
4.1 Connecting the 10Base-T Ethernet Port to PC (DTE)
4.2 Connecting the 10Base-T Ethernet Port to a Hub
4.3 T1/FT1 Interface Connection
4.4 DC Power Connection
5.0 Operation.............................................................................33
5.1 LED Descriptions
5.2 Loop (V.54 & Telco) Diagnostics
5.3 Bit Error Rate (V.52) Diagnostics
Appendix A - Specifications ........................................................39
Appendix B - Ethernet 10Base-T Specifications ........................40
Appendix C - Factory Replacement Parts and Accessories ......41
Appendix D - T1 Interface Pin Assignments ..............................42
1.0 WARRANTY INFORMATION
Thank you for your purchase of this Patton Electronics product.
This product has been thoroughly inspected and tested and is warranted for One Year parts and labor. If any questions or problems arise
during installation or use of this product, please do not hesitate to contact Patton Electronics Technical Support at (301) 975-1007.
1.1 WARRANTY STATEMENT
Patton Electronics warrants all Model 2720 Series components
to be free from defects, and will—at our option—repair or replace the
product should it fail within one year from the first date of shipment.
This warranty is limited to defects in workmanship or materials, and
does not cover customer damage, abuse, or unauthorized modification.
This product contains no serviceable parts; therefore you should not
attempt to modify the unit in any way. If this product fails or does not
perform as warranted, your sole recourse shall be repair or replacement as described above. Under no condition shall Patton Electronics
be liable for any damages incurred by the use of this product. These
damages include, but are not limited to, the following: lost profits, lost
savings and incidental or consequential damages arising from the use
of or inability to use this product. Patton Electronics specifically disclaims all other warranties, expressed or implied, and the installation or
use of this product shall be deemed an acceptance of these terms. In
the event that you detect intermittent or continuous product malfunction
due to nearby high power transmitting radio frequency equipment, use
only data cables with an external outer shield bonded to a metal or
metalized connector.
WARNING! This device is not intended to be con-
nected to the public telephone network in Europe.
1.2 RADIO AND TV INTERFERENCE
The NetLink-T1™ Model 2720 Series generates and uses radio
frequency energy, and if not installed and used properly—that is, in
strict accordance with the manufacturer's instructions—may cause
interference to radio and television reception. The Model 2720 Series
has been tested and found to comply with the limits for a Class A computing device in accordance with the specifications in Subpart J of Part
15 of FCC rules, which are designed to provide reasonable protection
from such interference in a commercial installation. However, there is
no guarantee that interference will not occur in a particular installation.
If the Model 2720 Series causes interference to radio or television
reception, which can be determined by disconnecting the cables, try to
correct the interference by one or more of the following measures:
moving the computing equipment away from the receiver, re-orienting
the receiving antenna, and/or plugging the receiving equipment into a
different AC outlet (such that the computing equipment and receiver
are on different branches).
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1.3 INDUSTRY CANADA NOTICE
The Canadian Department of Communications label identifies certified equipment. This certification means that the equipment meets
certain telecommunications network protective, operational and safety
requirements. The Department does not guarantee the equipment will
operate to the user's satisfaction. Before installing this equipment,
users should ensure that it is permissible to be connected to the facilities of the local telecommunications company. The equipment must
also be installed using an acceptable method of connection. In some
cases, the company’s inside wiring associated with a single line individual service may be extended by means of a certified connector assembly (telephone extension cord). The customer should be aware that
compliance with the above condition may not prevent degradation of
service in some situations. Repairs to some certified equipment should
be made by an authorized maintenance facility designated by the supplier. Any repairs or alterations made by the user to this equipment, or
equipment malfunctions, may give the telecommunications company
cause to request the user to disconnect the equipment. Users should
ensure for their own protection that the ground connections of the
power utility, telephone lines and internal metallic water pipe system,
are connected together. This protection may be particularly important
in rural areas.
1.4 FCC PART 68 COMPLIANCE STATEMENT
The Model 2720 Series has been tested and registered in compliance with the specifications in Part 68 of the FCC rules. A label on the
equipment bears the FCC registration number. You may be requested
to provide this information to your telephone company. Your telephone
company may make changes in its facilities, equipment, operations or
procedures that could affect the proper operation of the Model 2720
Series. If this happens, the telephone company should give you
advance notice to prevent the interruption of your service. The telephone company may decide to temporarily discontinue your service if
they believe your Model 2720 Series may cause harm to the telephone
network. Whenever possible, they will contact you in advance. If you
elect to do so, you have the right to file a complaint with the FCC. If
you have any trouble operating the Model 2720 Series, please contact
Patton Electronics Technical Support 301-975-1000. The telephone
company may ask you to disconnect the equipment from the telephone
network until the problem has been corrected or until you are certain
that the Model 2720 Series is not malfunctioning. In accordance with
FCC rules and regulation CFR 47 68.218(b)(6), you must notify the
telephone company prior to disconnection. The following information
CAUTION: Users should not attempt to make such connections
themselves, but should contact the appropriate electric inspection
authority, or electrician, as appropriate.
may be required when applying to your local telephone company for
leased line facilities. The Universal Service Order Code (USOC) is
RJ48. The Facility Interface Codes (FIC) are 04DU9-BN, 04DU9-DN,
04DU9-1KN, and 04DU9-1SN. The Service Order Code (SOC) is 6.0N.
Facility
Service Code Code Connection
1.544 Mbps SF format without line power 04DU9-BN 6.0N RJ48C
1.544 Mbps SF and B8ZS without line power 04DU9-DN 6.0N RJ48C
1.544 Mbps ANSI ESF without line power 04DU9-1KN 6.0N RJ48C
1.544 Mbps ANSI ESF and B8ZS w/o line power 04DU9-1SN 6.0N RJ48C
Interface Service Network
1.5 SERVICE INFORMATION
All warranty and non-warranty repairs must be returned freight
prepaid and insured to Patton Electronics. All returns must have a
Return Materials Authorization number on the outside of the shipping
container. This number may be obtained from Patton Electronics
Technical Support at: tel: (301) 975-1007 email:
support@patton.com www: http://www.patton.com. NOTE:
Packages received without an RMA number will not be accepted.
Patton Electronics' technical staff is also available to answer any questions that might arise concerning the installation or use of your Patton
Model 2720. Technical Support hours: 8AM to 5PM EST, Monday
through Friday.
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2.0 GENERAL INFORMATION
Thank you for your purchase of this Patton Electronics product.
This product has been thoroughly inspected and tested and is warranted
for One Year parts and labor. If any questions arise during installation or
use of the unit, contact Patton Electronics Technical Services at (301)
975-1007.
2.1 FEATURES
• Terminates T1/FT1 Circuits over a 4-Wire RJ-48C interface
• 10Base-T Ethernet bridge
• PPP (Point to Point Protocol, RFC 1661) with Bridge Control
Protocol (RFC 1638)
• Unstructured Rates at 1.544 Mbps
• D4 or ESF Framing Modes
• Supports AMI or B8ZS/B7ZS Line Coding
• Configuration via Software Control Port or Internal DIP Switches
• Six Easy-to-Read LED Indicators Monitor Data & Diagnostics
• Internal or Receive Recover Clocking
• Also Operates as a High-Speed Point-to-Point Modem
• Made in USA
2.2 GENERAL PRODUCT DESCRIPTION
The
NetLink-T1™
Model 2720/I is a single port T1/FT1 CSU/DSU
with Ethernet Bridging that provides high-speed LAN-to-WAN connectivity. Plugging directly into the 10Base-T port of a hub or LAN switch, the
NetLink-T1™ provides T1 or FT1 access at connection data rates of
1.544 Mbps, nx64, and nx56 (n=1 to 24 channels). The Netlink-T1™ is
an excellent choice for internet access as well as LAN-to-LAN services.
The Netlink-T1™ provides digital access to a local WAN service
provider or directly between two facilities over a dedicated 4-Wire circuit. WAN bandwidth, framing and coding options are programmed via
externally accessible DIP switches or via a VT-100 type terminal using
the rear-mounted EIA-232 Control Port. Netlink-T1™ supports D4/ESF
framing options and AMI/B8ZS/B7ZS line coding. Netlink-T1™ also supports a full range of system and diagnostic features that make system
setup easy. The Ethernet Bridge in this unit requires no configuration at
all.
The NetLink-T1™ provides T1 terminations over a modular RJ-48C
jack and comply with jitter tolerance capabilities as specified in ANSI
T1.403 and AT&T TR62411. External power options include 120VAC and
universal interface 100-240VAC. 48VDC and rack card versions are also
available.
3.0 PPP OPERATIONAL BACKGROUND
PPP is a protocol used for multi-plexed transport over a point-to-point
link. PPP operates on all full duplex media, and is a symmetric peer-to-peer
protocol, which can be broken into three main components: 1. A standard
method to encapsulate datagrams over serial links; 2. ALink Control Protocol
(LCP) to establish, configure, and test the data-link connection; 3. A family of
Network Control Protocols (NCPs) to establish and configure different network layer protocols.
In order to establish communications over a point-to-point link, each end
of the PPP link must first announce its capabilities and agree on the parameters of the link’s operation. This exchange is facilitated through LCP
Configure-Request packets.
Once the link has been established and optional facilities have been
negotiated, PPP will attempt to establish a network protocol. PPP will use
Network Control Protocol (NCP) to choose and configure one or more network layer protocols. Once each of the network layer protocols have been
configured, datagrams from the established network layer protocol can be
sent over the link. The link will remain configured for these communications
until explicit LCP or NCP packets close the link down, or until some external
event occurs.
The PPP Bridging Control Protocol (BCP), defined in RFC 1638,
configures and enables/disables the bridge protocol on both ends of
the point-to-point link. BCP uses the same packet exchange mechanism as the Link Control Protocol (LCP). BCP is a Network Control
Protocol of PPP, bridge packets may not be exchanged until PPP has
reached the network layer protocol phase.
3.1 APPLICATION
In situations where a routed network requires connectivity to a
remote Ethernet network, the interface on a router can be configured
as a PPP IP Half Bridge. The serial line to the remote bridge functions
as a Virtual Ethernet interface, effectively extending the routers serial
port connection to the remote network. The bridge device sends bridge
packets (BPDU's) to the router's serial interface. The router will receive
the layer three address information and will forward these packets
based on its IP address.
Figure 1 shows a typical Cisco router with a serial interface configured
as a PPP Half Bridge. The router serial interface uses a remote device that
supports PPP bridging to function as a node on the remote Ethernet network. The serial interface on the Cisco will have an IP address on the
same Ethernet subnet as the bridge.
For example, the customer site is assigned the addresses
192.168.1.0/24 through 192.168.1.1/24. The address 192.168.1.1/24 is
also the default gateway for the remote network. The above settings
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remove any routing/forwarding intelligence from the CPE. The associated Cisco configuration will set serial interface (s0) to accommodate
half bridging for the above example.
Authentication is optional under PPP. In a point-to-point leased-line
link, incoming customer facilities are usually fixed in nature, therefore
authentication is generally not required. If the foreign device requires
authentication via PAP or CHAP, the PPP software will respond with
default Peer-ID consisting of the units Ethernet MAC address and a
password which consists of the unit’s Ethernet MAC address.
Some networking systems do not define network numbers in packets sent out over a network. If a packet does not have a specific destination network number, a router will assume that the packet is set up
for the local segment and will not forward it to any other sub-network.
However, in cases where two devices need to communicate over the
wide-area, bridging can be used to transport non-routable protocols.
Figure 2 illustrates transparent bridging between two routers over
a serial interface (s0). Bridging will occur between the two Ethernet
Interfaces on Router A (e0 and e1) and the two Ethernet Interfaces on
Router B (e0 and e1).
3.1.1 Switch S2
The table below shows the default configurations for Switch S2. A
description of all S2 options follows this table.
Switches S2-1, S2-2, and S2-3
Use Switches S2-1, S2-2 and S2-3 to set the DTE data rate.
Each setting represents an nx56/nx64 setting. Individual channel settings can be configured through the software control port.
S2-1
S2-2 S2-3 Speed
Off Off Off Clear Channel (Unframed)
On Off Off 112kbps/128kbps
Off On Off 224kbps/256kbps
On On Off 336kbps/384kbps
Off Off On 448kbps/512kbps
On Off On 672kbps/768kbps
Off On On 896kbps/1024kbps
On On On 1344kbps/1536kbps
Switch S2-4: Line Framing and Coding
Use Switch S2-4 to control the Network Line Framing and Coding
Options. Set these options to be the same as the Line Framing and
Coding Options given to you by your Service Provider. If you are using
two Model 2720s together as short range modems, set both units identically.
Patton
2720
Bridge
Ethernet LAN
PEC Device w/ Serial I/F
Figure 1. Cisco router with serial interface, configured as PPP Half Bridge.
Router
S2-4 Line Framing & Coding
Off ESF/B8ZS
On D4/AMI
Line Framing Options:
D4/Superframe: The D4 framing format, as specified in AT&T
TR62411 is the standard in which twelve frames make up a
superframe. All signaling and synchronization are done inband.
Extended Superframe (ESF): Extended Superframe, as speci-
fied in AT&T TR 54016, consists of twenty-four (24) T1
frames. The framing bits are now used for framing, CRC and
the Facility Data Link (FDL). The FDL allows maintenance
messages and information to be passed between the 2720
and the Central Office.
Line Coding Options:
Alternate Mark Inversion (AMI): This mode does not inherently
account for ones density. To meet this requirement, each time
slot can be reduced to 56 kbps and the Least Significant Bit
(LSB) of each time slot set to one.
!
no ip routing
!
interface Ethernet0
ip address 1.1.1.1 255.255.255.0
bridge-group 1
!
interface Serial0
ip address 1.1.1.1 255.255.255.0
encapsulation PPP
bridge-group 1
!
interface Serial1
ip address 2.2.2.2 255.255.255.0
bridge-group 1
!
bridge 1 protocol ieee
!
Figure 2. Transparent bridging between two routers over a serial interface.
Bipolar 8 Zero
Router A
S1
LAN
Router B
LAN
S1
e0
LAN
8
Serial Interface
S0
e0
Using Bridge-Groups, multiple remote LANs can be
bridged over the wide-area.
S0
e1
Serial Interface
2720/I
T1/FT1 Link
LAN
LAN
2720/I
T1/FT1 Link
Substitution (B8ZS): This mode assures proper bit density
in the data stream. In this mode any data pattern can be
transmitted without causing ones density errors. This mode
allows for 64 kbps clear channel timeslots.
Switch S2-5: DS0 Channel Rate
Use Switch S2-5 to set the DS0 rate.
SW2-5
Setting
Off 56 kbps
On 64 kbps
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S2 SUMMARY TABLE
Position Function Factory Default Selected Option
S2-1 Data Rate On
S2-2 Data Rate On
S2-3 Data Rate On
S2-4 Framing & Coding Off
S2-5 DS0 Rate On
S2-6 Clock Mode Off
S2-7 Clock Mode Off
S2-8 Reserved Off
1.536 Mbps
(DTE Rate)
ESF/B8ZS
64 kbps
Network
Reserved
Network
Switch S2-6 and S2-7: Clock Mode
Set Switch S2-6 and S2-7 to determine the 2720’s transmitter tim-
ing.
S2-6
Off Off
On Off
NOTE 1: When using the Model 2720 as a high-speed short
range modem, one unit of the link must be configured in Internal
Clock mode, and the opposite end unit must be configured for
Network Clock mode.
If the ERR LED on the front of the unit is flashing (or on) it could
be an indication of a clocking problem. Double check your clock
mode settings and Tx Clock Invert S1-3 settings.
Switch S2-8 Reserved
S2-7
Clock Mode
Network Clock
derived from the received line signal.
Internal Clock
derived from an internal oscillator.
. Transmitter timing is
. Transmitter clock is
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3.1.2 Switch S1
The chart below shows the default configurations for Switch S1. A
description of all S1 options follows this table.
Switch S1-1: RDL Type
Switch S1-1 selects the type of Remote Digital Loopback that the
2720 will initiate when the RDL is initiated from this unit. The 2720 will
respond to both the V54 and the CSU loopback regardless of the setting of S1-1
S1-1
RDL Type
On Initiate a V.54 RDL loop when selected
Off Initiate a CSU loopback when selected
Switch S1-2: Reserved
Switch S1-3: Tx Clock Invert
Switch S1-3 allows the user to invert the transmit clock originating
in the 2720. When S1-2 is set for transmit clock, it may be necessary
to invert the transmit clock to allow for delays due to long cables.
S1-3
Tx Clock Invert
On Transmit clock is inverted
Off Transmit clock is normal
Switches S1-4 and S1-5: Line Build Out
Use Switches S1-4 and S1-5 to set the Line Build Out (LBO). The
Line Build Out varies the pulse shape and attenuation of the signal
sent to the network. The amount of Line Build Out depends on
NetLink™ T1’s distance to the last repeater. The telephone company
providing the service will advise on the amount of LBO necessary. In
most cases the default setting will suffice.
SW1-4
SW1-5 Function
Off Off (0dB)
On Off -7.5dB
Off On -15.0dB
On On -22.5dB
Switch S1-6 Through S1-8: Reserved
3.2 SOFTWARE CONFIGURATION
The Model 2720 features a menu-driven command system that
allows you to monitor/configure its operating parameters. Follow the
instructions below to configure the Model 2720 using the software
selections:
S1 SUMMARY TABE
Position Function Factory Default Selected Option
S1-1
S1-2
S1-3
S1-4
S1-5 Off
S1-6
S1-7
S1-8 Reserved Off
1) Plug the 9-pin male end of the cable to your terminal or com-
puter’s DB-9 serial port and start up the terminal emulator
software if necessary. Plug the miniature stereo plug into the
rear of the unit. The small recessed jack on the left side of
the unit is the control port jack.
RDL Type
Reserved
Tx Clock Invert
Line Build Out
Reserved
Reserved
On
On
Off
Off
Off
Off
V.54 RDL
Normal
0dB
NOTE: If your terminal uses a DB-25 connector, please use a
DB-9 to DB-25 Adapter to connect to the cable.
2) Power up the terminal and set its RS-232 port as follows:
9600 Baud
8 data bits, 1 stop bit, no parity
Local echo off
ANSI or VT-100 emulation
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3) Here is an example of a terminal emulator setup session. In
normal font are the various parameter types. In bold type are
the values that should be used for best results. Your terminal
program’s setup screen may differ from this one:
Clocking: Network
(default)
Options: Network, Internal, External
Network: This is the most commonly used setting when connect
ing to a carrier’s network. In this mode, the unit recovers the
clock from the received signal and uses it to transmit data. In
this way the unit remains synchronized to a master clock.
Incampus applications, one of the units must be set to Internal
clock, and the other end is set to Network clock. At all times,
there must be only one clock source. Otherwise, clock slips
and framing errors and bit errors may occur.
Internal: This is commonly used in campus applications, where
the unit is not connected to the public telephone network
directly. In this mode, the unit uses the on-board oscillator as
the transmit clock source.
Line Build Out (dB): 0 – 133 feet, 0 dB
(default)
Options: -7.5 dB
-15.0 dB
-22.5 dB
This controls the transmitter signal strength and pulse shape. For
most applications, the default setting will suffice. When connecting to a
carrier connection, the carrier will determine what LBO is necessary.
0dB provides the highest signal strength and therefore the longest dis-
Baud rate: 9600 Parity: None Data Length: 8 Stop Bits: 1
Default terminal type: VT100
Local Echo: Off
Add Line Feeds after CRs: Off
Received Backspace Destructive: On
Backspace key sends: BS
XON/XOFF software flow control: On
CTS/RTS hardware flow control: Off
DSR/DTR hardware flow control: Off
tance, while –15.0 dB provides the lowest usable signal strength. The
last setting, –22.5 dB, is usually only used to test the line and should
not be used in normal applications.
4) When the unit is first turned on, the terminal screen may
appear blank. Press the [Enter] key. If your serial connection
is good, the unit will immediately display a password prompt.
The following message will appear in the middle of the
screen:
Patton Electronics
Menu Management
Enter Password: _
5) Type in the password and press [Enter]. The factory default
password for the unit is (password is case sensitive):
patton
NOTE: If the entry is incorrect, the password screen will clear
and prompt you again for the correct password. The password
you enter will not be shown. For security, asterisks will be displayed for each letter you type. The maximum length of the
password, which can include any character the terminal can
generate, is 16 characters.
6) The Model 2720 will then display the Main Menu screen.
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