Patton electronics NetLink 2720/B Manuel utilisateur

USER

MANUAL

MODEL 2720/B and 2720/C

Series

NetLink-T1™

T1/Fractional T1 CSU/DSU

SALES OFFICE

(301) 975-1000

TECHNICAL SUPPORT

(301) 975-1007

http://www.patton.com

Part# 07M2720-UM

Doc# 08615U2-001,

Rev. B

Revised 10/26/06

An ISO-9001

Certified Company

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 (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 cus-

tomer 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 con-

dition shall Patton Electronics be liable for any damages incurred by the

use of this product. These damages include, but are not limited to, the fol-

lowing: 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 mal-

function 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 fre-

quency 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 accor-

dance 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.

1.3 INDUSTRY CANADA NOTICE

The Canadian Department of Communications label identifies cer-

tified 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 facili-

ties 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 individ-

ual service may be extended by means of a certified connector assem-

bly (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 sup-

plier. 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 serv-

ice, you must provide the telephone company with the following data.

When you request T1 Service, you must provide the telephone compa-

ny with the Facility Interface Code. Provide the telephone company

with both of the following codes: 04DU9-B (1.544 MB D4 framing for-

mat) 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, equip-

ment, 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 dis-

connect 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: (301) 975-1007 email:

[email protected] 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). A Certificate 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

3.0 CONFIGURATION

The Model 2720 features configuration capability via hardware

DIP switches or a software control port. This section describes all pos-

sible 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 configu-

ration 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 (301) 975-1007.

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™ pro-

vides 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 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 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.

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

Front

Rear

OFF

1234

5678

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

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 set-

tings 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 iden-

tically.

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 in-

band.

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

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 set-

ting 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

910

S1 SUMMARY TABE

Position Function Factory Default Selected Option

S1-1

RDL Type

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 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.

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: 8Stop 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

13 14

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:

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 dis-

played 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.

Patton Electronics

Menu Management

Enter Password: _

3.2.1 Introduction to Main Menu

After entering the password, you may access all of the system’s

functions and parameters. The Main Menu looks like this:

HELPFUL HINTS

1. To make a selection, key the highlighted letter that corre-

sponds to a menu selection.

2. To execute the selection, type [Enter/CR]

3. To toggle between options on a highlighted selection, Press

[space].

4. Select Save Changes from Main Menu after making modi-

fications to any Model 2720 parameter. Otherwise, changes

will be lost when the Model 2720 is turned off.

Header Line 1 Header Line 2

Highlighted items

Commands

Commands and text entered here

15 16

The Main Menu options are briefly described below.

System Configuration options allow you to change various

aspects of the Model 2720’s operation, e.g., framing, line cod-

ing, and aggregate bandwidth.

System Diagnostics/Statistics options allow you to monitor

the network performance, initiate V.54 loops, local loops, and

send test patterns. Network performance parameters are

updated once a second, giving you the ability to quickly deter-

mine if there is a problem.

Unit Information allow you to customize the Model 2720 for

your location. You can change the default header names to

give each unit a unique name and password. Also, you can

reset the unit to its default settings without the manual. It also

has a Service Information screen in case you need technical

assistance from Patton Electronics.

Implement and Save Changes. Once you have configured

the unit to your satisfaction, you can save the changes per-

manently by executing the Save Changes command. This will

update the unit’s configuration and save all the parameters to

permanent memory.

Logoff. For security, log off the control menu by executing

the Logoff command. This will blank the screen until an

[Enter] key is pressed.

3.2.2 System Configuration

The default System Configuration menu looks like this:

The System Configuration options are described below:

Line Format: ESF

(default)

Options: ESF, D4, UNFRAMED

D4: This is an older, but widely used, line format that does not

provide FDL, so network interface performance cannot be

monitored so easily. AT&T TR 62411 contains the specifica-

tions for this format and the ESF. D4 is also known as

Superframe format. According to TR 62411, “The Superframe

format…consists of 12 frames of 193 bits each for a total of

2316 bits. Each 193 bit frame consists of 192 bits preceded

by one framing bit….the framing bit is time shared to both

synchronize the terminal equipment and to identify the signal-

ing frames.” (Sec. 4.1.1)

Commands and text entered here

17 18

ESF: This stands for Extended Superframe Format, a line format

developed by AT&T. AT&T Technical Reference 54016 (TR

54016) defines the ESF, a format which is commonly used to

allow monitoring of the network interface performance over

the Facility Data Link (FDL). AT&T TR 62411 says, “the

Extended Superframe Format “extends” the DS1 superframe

structure from 12 to 24 frames…for a total of 4632 bits. It

redefines the 8 kb/s channel previously used exclusively for

terminal and robbed bit signaling synchronization.” The ESF

provides a 4 kb/s data link, called the FDL, which allows for

in-service monitoring and fast troubleshooting. Certain net-

work services require the ESF.

UNFRAMED:This is a special mode that allows you to achieve the

maximum possible data rate of 1.544 Mb/s (million bits per

second) by using the framing bits for data transmission. There

is no signaling or FDL. This is commonly used for campus

connections, and by the Federal government and the military.

This format is not to be used when connecting to a public car-

rier’s network without its permission. This provides one chan-

nel at a rate of 1.544 Mb/s. In addition, this format can be

used with external clocking.

Line Coding: B8ZS

(default)

Options: AMI, B8ZS, B7ZS.

AMI: Alternate Mark Inversion defines a pulse as a “mark”, a

binary one, as opposed to a zero. In a T1 (DS1) network con-

nection, signals are transmitted as a sequence of ones and

zeros. Ones are sent as pulses, and zeros are sent as

spaces, i.e., no pulse. Every other pulse is inverted from the

previous pulse in polarity, so that the signal can be effectively

transmitted. This means, however, that a long sequence of

zeros in the data stream will cause problems, since the

CSU/DSU receiving the signal relies on the signal to recover

the 1.544 Mb/s clock. To get around this problem, one method

is to limit the data rate per channel (known as a DS0,

because it is a 64 kb/s portion of the DS1 frame or super-

frame) to 56 kb/s and forcing a pulse in the last data bit to

ensure a minimum pulse density in the signal. If you must use

AMI with a DS0 data rate of 64 kb/s, you should ensure that

the data terminal equipment connected to the unit provides a

minimally acceptable pulse density. For this reason, there are

advantages to using B8ZS instead.

B8ZS: Bipolar violations occur when consecutive pulses are of

the same polarity. In B8ZS, or Bipolar Eight Zero Substitution,

bipolar violations are introduced deliberately to indicate that

eight zeros have been transmitted. This special encoding is

recognized by the receiver and decoded correctly. See AT&T

TR62411 Section 4.2.2 for a detailed description of B8ZS.

This enables information to be sent over a T1 connection

without any constraints on the data’s pulse density. This is the

most acceptable way to accomplish 64 kb/s on each DS0

channel.

B7ZS: This stands for Bipolar Seven Zero Substitution. Instead of

introducing bipolar violations, this method substitutes a one

for a zero in bit 7 (out of 8) of a DS0 channel when the data in

that channel are all zeros. This is a special form of AMI and is

compatible only with special equipment. For most applica-

tions, AMI or B8ZS will suffice.

DS0 Line Rate: 64kbps

(default)

Options: 64kbps, 56kbps

64kbps: Also known as Clear Channel, this takes full advantage

of the available bandwidth in a DS0 channel. Implementing it

usually requires B8ZS line coding. In certain cases, special

equipment may implement Clear Channel using AMI or B7ZS.

Consult the equipment manual for compatibility. Your carrier

will advise you on whether to use 64 or 56 kb/s. Campus

applications may not have such restrictions, enabling you to

use 64kbps. In Unframed format, the 24 DS0s and the fram-

ing bits are combined to provide 1.544Mb/s for your use.

56kbps: This uses only the first seven bits of the DS0, limiting the

data rate per DS0 channel to 56 kb/s. Your carrier will advise

you on whether to use 64 or 56 kb/s. This is not available

when using the Unframed format.

Ce manuel convient aux modèles suivants

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