Patton electronics 2720/B, 2720/C, NetLink-T1 2720/C Series User Manual

USER
MANUAL

MODEL 2720/B and 2720/C
Series

NetLink-T1™

T1/Fractional T1 CSU/DSU

SALES OFFICE
[phone]
TECHNICAL SUPPORT
[phone]
http://www.patton.com

Part# 07M2720-UM
Doc# 08615U2-001,
Rev. B
Revised 10/26/06

An ISO-9001

Certified Company

1 2

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 ComplianceStatement

1.5 Service Information

1.6 CE Notice

2.0 General Information...............................................................5

2.1 Features

2.2 General Product Description

3.0 Configuration.........................................................................6

3.1 DIP Switch Configuration

3.2 Software Configuration

4.0 Installation ..........................................................................32

4.1 DTE Interface Connection

4.2 Network Interface Connection

4.3 DC Power Supply

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 - Cable Recommendations......................................40

Appendix C - Factory Replacement Parts and Accessories ......41

Appendix D - T1 Interface Pin Assignments ..............................42

Appendix E - DTE Interface Pin Assignments ............................44

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 [phone].

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.

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 Acomputing 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).

WARNING! This device is not intended to be con-

nected to the public telephone network in Europe.

43

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

This equipment complies with Part 68 of FCC Rules. Please note the
following:

1. You are required to request service from the telephone company
before you connnect the CSU to a network. When you request serv­ice, you must provide the telephone company with the following data.
When you request T1 Service, you must provide the telephone compa­ny with the Facility Interface Code. Provide the telephone company
with both of the following codes: 04DU9-B (1.544 MB D4 framing for­mat) and 04DU9-C (1.544 MB ESF format). The telephone company
will select the code it has available. The Service Order Code(s) (SOC):

6.0N. The required Universal Service Order Code (USOC) jack: RJ
48C. The make, model number, and FCC Registration number of the
CSU.

2. Your telephone company may make changes to its facilities, equip­ment, operations, or procedures that could affect the proper functioning
of your equipment. The telephone company will notify you in advance
of such changes to give you and opportunity to maintain uninterrupted

telephone service.

3. If your CSU causes harm to the telephone network, the telephone
company may temporarily discontinue your service. If possible, they
will notify you in advance, but if advance notice is not practical, you will
be notified as soon as possible and will be informed of your right to file
a complaint with the FCC.

4. If you experience trouble with the CSU, please contact Patton
Electronics, Co. for service or repairs. Repairs should be performed
only by Patton Electronics Co.

5. You are required to notify the telephone company when you dis­connect the CSU from the 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: [phone] email:

[e-mail] www: http://www.patton.com.
NOTE: Packages received without an RMA number will not be accept-

ed. Patton Electronics' technical staff is also available to answer any
questions that might arise concerning the installation or use of your
Patton Model 2710RC. Technical Support hours: 8AM to 5PM EST,

Monday through Friday.

1.6 CE NOTICE

The CE symbol on your Patton Electronics equipment indicates
that it is in compliance with the Electromagnetic Compatibility (EMC)
directive and the Low Voltage Directive (LVD) of the European Union
(EU). ACertificate of Compliance is available by contacting Technical
Support.

CAUTION: Users should not attempt to make such connections
themselves, but should contact the appropriate electric inspection
authority, or electrician, as appropriate.

Facility
Interface Service Network

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

5

6

3.0 CONFIGURATION

The Model 2720 features configuration capability via hardware
DIP switches or a software control port. This section describes all pos­sible hardware and software switch configurations of the NetLink-T1™.

3.1 DIP SWITCH CONFIGURATION

The Model 2720 has two eight bit DIP switches that allow configu­ration for a wide range of applications. The switches are externally
accessable by removing the plate on the bottom side of the unit.
Figure 1 (below) shows the location of the DIP switches on the bottom
of the printed circuit board.

DIP Switches S1 and S2 can be configured as either “On” or “Off”.
Figure 2 (below) shows the orientation of the DIP switches with respect
to ON/OFF positions. Default position and descriptions for Switches
S1 and S2 are provided on pages 6-10.

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 [phone].

2.1 FEATURES

• Terminates T1/FT1 Circuits over a 4-Wire RJ-48C interface

• Connects to standard CPE Serial Interfaces

• Common Framed nx56/64 rates up to 1.536 Mbps

• 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, External or Network Clocking

• Also Operates as a High-Speed Point-to-Point Modem

• Made in USA

2.2 GENERAL PRODUCT DESCRIPTION

The

NetLink-T1™

Model 2720 Series are single port T1/FT1

CSU/DSUs that provide high-speed WAN connectivity. Plugging directly into
the serial WAN port of a switch, router or multiplexer, 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 when
terminating leased line services, Frame Relay backbones, 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 rear­mounted 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 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&TTR62411. External power options include 120VAC and universal
interface 100-240VAC. 48VDC and rack card versions are also available.

Figure 1. Underside of Model 2720, Showing Location of DIP Switches

Front

Rear

OFF

S1

S2

ON

1234

ON

5678

Figure 2. Close up of DIP switches showing ON/OFF positions.

8

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.

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.

Bipolar 8 Zero 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

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 DS Zero 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

7

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: Tx Clock Select

Switch S1-2 selects the clock that is used to accept the Transmit
Data from the DTE interface. Standard DTE interfaces will transmit
data with respect to the External Clock. In some cases a DTE interface
will transmit with respect to the Transmit clock sent out from the 2720.
Please review the information provided with your DTE equipment for
more information on its' operation. In most cases when there are errors
on the line only in the direction of the transmit data either S1-2 or S1-3
can be changed to solve the problem.

S1-2 Tx Clock Select

On Transmit data accept with respect to the transmit

clock from the 2720

Off Transmit data accept with respect to the external

clock from the DTE

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 S2-7 Clock Mode

Off Off

Network Clock

. Transmitter timing is

derived from the received line signal.

On Off

Internal Clock

. Transmitter clock is

derived from an internal oscillator.

Off On

External Clock.

Transmitter clock is

derived from DTE interface.

NOTE 1: When using the Model 2720 as a high-speed short
range modem, one unit of the link must be configured in
Internal/External 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 your Tx Clock Select (S1-2) and Tx Clock
Invert S1-3 settings.

Switch S2-8 Reserved

9

10

S1 SUMMARY TABE

Position Function Factory Default Selected Option

S1-1

RDL Type

On

S1-2

Tx Clock Select

Off

S1-3

Tx Clock Invert

Off

S1-4

Line Build Out

Off
S1-5 Off
S1-6

Reserved

Off
S1-7

Reserved

Off

S1-8 Reserved Off

V.54 RDL
External Clock

Normal

0dB

11

12

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:

1) Plug the 9-pin male end of the cable to your terminal or com­puter’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.

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

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:

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