Patton electronics NetLink 2707C User manual

USER

MANUAL

MODEL 2707C, D

G.703 NTU with

V.35, X.21

Interfaces

SALES OFFICE

(301) 975-1000

TECHNICAL SUPPORT

(301) 975-1007

Part# 07M2707-UM

Doc# 08619U2-001,

Rev. B

Revised 10/27/06

An ISO-9001

Certiﬁed Company

TABLE OF CONTENTS

1.0 Warranty Information ................................................................. 2

1.1 FCC Information ........................................................................... 2

1.2 CE Notice...................................................................................... 2

1.3 Service.......................................................................................... 3

2.0 General Information.................................................................... 4

2.1 Features........................................................................................ 4

2.2 Description.................................................................................... 4

3.0 Configuration .............................................................................. 5

3.1 DIP Switch Configuration.............................................................. 5

Switch SW1-1 through SW1-8...................................................... 6

Switch SW1-1 Line Coding: HDB3 (default)............................... 6

SW1-2 Local Loop: Inactive (default) ........................................... 7

SW1-6 and SW1-7 Clock Modes.................................................. 8

SW1-8: Enable/Disable Loop Tests from DTE............................. 8

4.0 Installation................................................................................... 9

4.1 Connecting To The G.703 Network.............................................. 9

Connecting the 2707/D (X.21 version) Dual

Coaxial Cable (75 Ohm) to the G.703 Network............................ 9

Opening the Case......................................................................... 9

Connecting the Twisted Pair (120 Ohm) to

the G.703 Network...................................................................... 10

4.2 Connecting The Serial Port......................................................... 10

Connecting to a “DTE” Device.................................................... 10

Connecting to a “DCE” Device ................................................... 10

Configuring the X.21 Interface (2707/D)..................................... 10

4.3 Power Connection ...................................................................... 11

Universal AC Power (100-240VAC) ........................................... 11

DC Power................................................................................... 12

5.0 Operation................................................................................... 13

5.1 Power-up .................................................................................... 13

5.2 LED Status Monitors................................................................... 13

5.3 Local Loop Diagnostics............................................................... 14

Operating Local Loopback (LL).................................................. 14

A Model 2707, G.703 Specifications ........................................... 15

B Model 2707, Interface Pin Assignment ................................... 16

C Model 2707, Interface Pin Assignment ................................... 18

D Model 2707, Factory Replacement Parts

And Accessories....................................................................... 19

1.0 WARRANTY INFORMATION

Patton Electronics

warrants all Model 2707 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. 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

spe-

ciﬁcally disclaims all other warranties, expressed or implied, and the

installation or use of this product shall be deemed an acceptance of

these terms by the user.

1.1 FCC INFORMATION

This equipment has been tested and found to comply with the limits for a

Class A digital device, pursuant to Part 15 of the FCC Rules.These limits

are designed to provide reasonable protection against harmful interfer-

ence when the equipment is operated in a commercial environment.This

equipment generates, uses, and can radiate radio frequency energy and,

if not installed and used in accordance with the instruction manual, may

cause harmful interference to radio communications.Operation of this

equipment in a residential area is likely to cause harmful interference in

which case the user will be required to correct the interference at his own

expense.If this equipment does cause harmful interference to radio or

television reception, which can be determined by turning the equipment

off and on, the user is encouraged to try to correct the interference by

one or more of the following measures:

• Reorient or relocate the receiving antenna

• Increase the separation between the equipment and receiver

• Connect the equipment into an outlet on a circuit different from that to

which the receiver is connected

1.2 CE NOTICE

The CE symbol on your Patton Electronics equipment indicates that it is

in compliance with the Electromagnetic Compatibility (EMC) directive

and the LowVoltage Directive (LVD) of the Union European (EU). A Cer-

tiﬁcate of Compliance is available by contactingTechnical Support.

1.3 SERVICE

All warranty and nonwarranty repairs must be returned freight prepaid

and insured to Patton Electronics. All returns must have a Return Mate-

rials Authorization number on the outside of the shipping container.This

number may be obtained from Patton Electronics Technical Services at:

Tel:

(301) 975-1007

E-mail:

[email protected]

URL:

www.patton.com

Note

Packages received without an RMA number will not be

accepted.

Patton Electronics' technical staff is also available to answer any ques-

tions that might arise concerning the installation or use of your Patton

Model 2707. Technical Service hours:

8AM

5PM EST, Monday

through

Friday

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

OneYear parts and labor. If any questions or problems arise during

installation or use of this product, please do not hesitate to contact

Pat-

ton ElectronicsTechnical Support

(301) 975-1007

2.1 FEATURES

• Terminates G.703 E1 service (2.048 Mbps)

• Available in low-cost standalone or rack-mountable versions

• X.21 and V.35

• Switch-selectable AMI or HDB3 line encoding options

• Switch-selectable DTE/DCE modes for X.21 version

• 75 Ohm dual coax and 120 Ohm twisted-pair G.703 connections

• Local loopback diagnostics

• Internal, External, and G.703 network timing

• CE approval

• 100-240VAC & 48VDC power options

• Conforms to ONP requirements CTR 12 for connection to international

Telecom networks

2.2 DESCRIPTION

The Model 2707 receives clear channel E1/G.703 (2.048 Mbps) data

from the telco's digital data network.The Model 2707 terminates the

G.703 telco interface and converts the data for transmission to a user-

oriented serial (X.21 and V.35).The 2707 can connect to a Router,

FRAD, PABX or Multiplexer over its serial interface at 2.048 Mbps.

3.0 CONFIGURATION

The Model 2707 features conﬁguration capability via hardware DIP

switches. This section describes all possible DIP switch conﬁgurations

of the Model 2707.

3.1 DIP SWITCH CONFIGURATION

The Model 2707 has one internal DIP switch that allow conﬁguration for

a wide range of applications. The switch is accessed from the underside

of the 2707. Figure 1 shows the location of the DIP switch on the bottom

of the printed circuit board.

Figure 1.

Underside of Model 2707, Showing Location of DIP Switches

The Model 2707 DIP switch can be conﬁgured as either “ON” or “OFF”.

Figure 2 shows the orientation of the DIP switch with respect to ON/OFF

positions.

Figure 2.

Close up of conﬁguration switches

Switch SW1-1 through SW1-8

Switch SW1-1 Line Coding: HDB3 (default)

Use Switch SW1-1 to control the Network Line Coding options. Set

these options to be the same as the Line Coding given to you by your

Service Provider. If you are using two Model 2707s together as short

range modems, set both units to HDB3.

Table 1:

Switch Set 1 Summary

Position Function Factory Default Selected Option

SW1-1 Line Code OFF HDB3

SW1-2 LLB OFF OFF

SW1-3 Reserved

SW1-4 Reserved

SW1-5 Reserved

SW1-6 Clock Mode OFF Received

Recovered

SW1-7 Clock Mode OFF Received

Recovered

SW1-8 TM from DTE OFF Enabled

SW1-1 Line Encoding

Off HDB3

On AMI

Options:

HDB3, AMI

HDB3:

In this line coding, the transmitter substitutes a deliberate bipolar

violation when excessive zeros in the data stream are detected.The

receiver recognizes these special violations and decodes them as zeros.

This method enables the network to meet minimum pulse density

requirements.Unless AMI is required in your application, HDB3 should

be used whenever possible.

AMI:

Alternate Mark Inversion deﬁnes a pulse as a “mark,” a binary

one, as opposed to a zero.In an E1 network connection, 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 NTU receiving

the signal relies on the signal to recover the 2.048 Mbps clock.

If you must use AMI, 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 HDB3 instead. AMI coding

does not inherently account for ones density. To meet this requirement,

the user should ensure that the data inherently meets pulse density

requirements.

SW1-2 Local Loop: Inactive (default)

Use SW1-2 to activate/deactivate local loopback test.

Table 2:

SW1-2 Local Loop Setting

SW1-2 Setting

Off Local Loopback Inactive

On Local Loopback Active

SW1-6 and SW1-7 Clock Modes

Use Switches SW1-6 and SW1-7 to conﬁgure the 2707 for internal,

external, or receive recover clock mode.

SW1-8: Enable/Disable LoopTests from DTE

Use Switch SW1-8 to allow Model 2707 to enter loopback tests when the

DTE raises the appropriate loop request pin.

Table 3:

SW1-6 and SW1-7 Clock Modes

SW1-6 SW1-7 Clock Mode

ON ON Network (Received Recovered)

ON OFF Internal

OFF ON External

OFF OFF Network (Received Recovered)

Network Clock Transmitter timing is derived using

the received line signal (received

recovered) from the network.

Internal Clock Transmitter timing is derived from

an internal clock source.

External Clock Transmitter timing is derived from

DTE terminal timing.

SW1-8 Setting

Off Response to DTE Loopback Request Enabled

On Response to DTE Loopback Request Disabled

4.0 INSTALLATION

Once the Model 2707 is properly conﬁgured, it is ready to connect to the

G.703 interface, to the serial port, and to the power source. This section

describes how to make these connections.

4.1 CONNECTING TO THE G.703 NETWORK

The Power, G.703 and serial Line connections are located on the rear

panel of the Model 2707. The following sections describe operation of

these connections.

Connecting the 2707/D (X.21 version) Dual Coaxial Cable (75 Ohm)

to the G.703 Network

The Model 2707/D (X.21 version) is equipped with dual female BNCs

(TX and RX) for connection to a 75 Ohm dual coax G.703 network inter-

face.If your G.703 network terminates via dual coaxial cable, use the

diagram below to make the proper connections. (SeeFigure 3).

Figure 3.

Rear Panel, Showing Location of Connectors

Note

The outer conductor of the coax cables are isolated from system

earth ground.

When using the 75 Ohm interface, jumper straps JP2, JP6, JP7, and JP5

must be installed over the jumpers. The jumpers are located next to the

BNC connectors.Refer to the following section to open the case. Open

the case and install jumper straps for JP2, JP6, JP7, and JP5.

Opening the Case

Open the case by inserting a screwdriver into the slots and twist the

screwdriver head slightly. The top half of the case will separate from the

lower half of the case. Take caution not to damage any of the PC board

mounted components.

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