Patton 2450 User Manual

USER
MANUAL

MODEL 2450

56/64 Kbps, 4-Wire
DDS & Clear Channel
CSU/DSU

CERTIFIED

An ISO-9001

Certified Company

Part# 07M2450-B
Doc# 099051UB
Revised 3/12/97

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

1.0 WARRANTY INFORMATION

Patton Electronics warrants all Model 2450 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 specifically 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.

Your telephone company may make changes in its facilities,
equipment, operations or procedures that could affect the proper
operation of the Model 2450 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 2450 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. 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 2400 Series is not
malfunctioning.

The following information may be required when applying to your
local telephone company for leased line facilities.

1.1 RADIO AND TV INTERFERENCE

The Model 2450 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 2450 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 2450
does cause interference to radio or television reception, which can be
determined by disconnecting the RS-232 interface, the user is
encouraged to 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). In the event the
user detects intermittent or continuous product malfunction due to
nearby high power transmitting radio frequency equipment, the user is
strongly advised to use data cables with an exterior outer shield bonded
to a metal or metalized connector

1.2 FCC INFORMATION

The Model 2400 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.

Service Digital Facility Service Order Network
Type Interface Code Code Jacks

56 Kbps 04 DU5 - 56 6.0F RJ48S
64 Kbps 04 DU5 - 64 6.0F RJ48S

1.3 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: [phone]; http://www.patton.com; or,
[e-mail]. Notice: 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 Model 2400. Technical Service hours: 8AM

to 5PM EST, Monday through Friday.

1.4 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 Union European
(EU). A Certificate of Compliance is available by contacting Patton
Technical Support.

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2.0 GENERAL INFORMATION

3.0 CONFIGURATION

Thank you for your purchase of this Patton Electronics product.
This product has been thoroughly inspected by Patton's qualified
technicians. 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].

2.1 FEATURES

• Synchronous data rates of 56 or 64 Kbps

• Full duplex communication over two dedicated twisted pairs

• Supports distances to 3.4 miles over 26 AWG wire

• Selectable internal, external or network rcv/recover clock options

• Built-in V.54 loopback tests and V.52 BER test patterns

• Works with 56 Kbps DDS, 64 Kbps Clear Channel, or private
twisted pair circuits

• Switchable Circuit Assurance feature

• Externally accessible configuration switches

• Six front panel LEDs monitor communication and test status

• RJ-48S jack provided for line connection

• RS-232 & RS-422/530 versions have DB-25 connector

• V.35 version has either DB-25 or M/34 connector

• Ultra-compact enclosure fits in tight spaces

2.2 DESCRIPTION

The Model 2450 DDS & Clear Channel CSU/DSU is a standalone ,

AC powered CSU/DSU designed for 4-wire, full duplex communications
over dedicated twisted-pair. Synchronous data rates of 56 and 64 Kbps
are supported, at distances up to 3.4 miles. The Model 2450 provides
selectable timing options of internal, external or network receive­recovered clock. A circuit assurance feature is also provided.

For user convenience, the Model 2450’s DIP switches are
externally accessible, so there is no need to open the case to configure
the unit. The Model 2450’s built-in V.54 loopback test modes and V.52
BER test patterns are accessed using two front panel switches. Six
front panel LEDs monitor test modes and communication status. Line
connections are facilitated by a modular RJ-48S jack on the rear of the
unit.

The Model 2450 is easy to install and is ruggedly designed for
excellent reliability: just set it and forget it. The following instructions
will help you set up and install the Model 2450 properly.

3.1 CONFIGURATION SWITCHES

The Model 2450 uses a mini DIP switch package that allows
configuration to a wide range of applications. This DIP switch is
externally accessible from the underside of the Model 2450 (see Figure
1, below), therefore you do not need to open the Model 2450's case
during configuration.

REAR

ON

S1

12345678

FRONT

Figure 1. Underside of Model 2450, showing location of DIP switches

3.2 CONFIGURATION SWITCH SET “S1”

The switches shown in Figure 2 below and on DIP switch S1 control
clock mode, circuit assurance, RTS, data rate and test loop functions.
Following Figure 2 are factory default settings and detailed switch
descriptions for each switch.

ON

ON

12345678

OFF

Figure 2. Close-up of DIP switches showing “ON” and “OFF” positions

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4

S1 SUMMARY TABLE

Position Function Factory Default

S1-1 Clock Mode Off
S1-2 Clock Mode On
S1-3 Circuit Assurance Off Disabled
S1-4 RTS On Forced On
S1-5 Line Rate Off 56 kbps
S1-6 Front Panel Switches Off Enabled
S1-7 DTE Loop Control On Disabled
S1-8 Receive RDL Off Enabled

Switches S1-1 and S1-2: Clock Mode

The setting for switches S1-1 and S1-2 determines the transmitter

clocking mode for the Model 2450.

}

Network

Switch S1-3: Circuit Assurance

On dedicated circuits, the transmitter and the CTS output can be
configured to go On only when a working communication circuit is
established. If Circuit Assurance is used, enable it on only one end of
the communication link.

Circuit

S1-3 Assurance Description

On Enabled CTS will go low and the

transmitter will be held off if the
receiver is in the No Signal state
or CD is low

Off Disabled The transmitter and CTS will

operate without regard to the
receiver state

Switch S1-4: RTS

S1-1

On Off External (DTE) Transmit clock derived

Off On Network (Looped) Transmit clock derived

Off Off Internal (Master) Transmit clock derived

On On Campus Clock Transmit clock derived

S1-2 Clock Mode Description

from terminal interface

from the received line
signal; Use this mode
for Dedicated DDS
operation

internally

from received line
signal. Allows remote
device (in

clock

mode) to initiate
V.54 loopback. For use
only in campus short­haul configuration.
(Note: Local device
must be in
clock mode.)

campus

internal

The RTS input can be forced on, ignoring the terminal’s RTS
signal. RTS controls the transmitter by either sending the user’s data
or sending an idle code.

S1-4

On Forced On Transmitter is always ON
Off Follows The RTS input controls the

Switches S1-5: Data Rate

This switch controls the data rate on the line (RJ-48S port) and
must match the speed of your digital service.

S1-5

Off 56 kbps

On 64 kbps

RTS Description

DTE Signal transmitter

Setting

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