Patton electronics NetLink 2707C User manual

USER
MANUAL
MODEL 2707C, D
G.703 NTU with
V.35, X.21
Interfaces
SALES OFFICE
[phone]
TECHNICAL SUPPORT
[phone]
Part# 07M2707-UM
Doc# 08619U2-001,
Rev. B
Revised 10/27/06
An ISO-9001
Certified Company

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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

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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.

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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:
[phone]
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 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
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 at [phone] .
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.

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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.

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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

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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

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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

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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.