PairGain PF-FLEX FLC-704 User manual

PG-FLEX

8 CHANNEL POTS

CENTRAL OFFICE CHANNEL UNIT

PAIRGAIN TECHNOLOGIES, INC.

ENGINEERING SERVICES TECHNICAL PRACTICE

SECTION 363-704-121-01

Model List Number Part Number CLEI Code

FLC-704 2A 150-1304-21

PairGain

FLC 704

CHAN UNIT

LIST

FAULT

363-704-121-01, Revision 01

ii July 30, 1999 FLC-704 List 2A

Revision History of This Practice

PairGain and PG-Flex are trademarks of PairGain Technologies, Inc.

Information contained in this document is company private toPairGain Technologies, Inc., and shall not be modified, used, copied,

reproduced or disclosed in whole or in part without the written consent of PairGain.

Other product names mentioned in this practice are used for identification purposes only and may be trademarks or registered

trademarks of their respective companies.

Revision Release Date Revisions Made

01 July 30, 1999 Initial release.

363-704-121-01, Revision 01 Using This Technical Practice

FLC-704 List 2A July 30, 1999 iii

USING THIS TECHNICAL PRACTICE

Three types of messages, identified by icons, appear in the text.

INSPECTING YOUR SHIPMENT

Upon receipt of the equipment:

•Unpack each container and visually inspect it for signs of damage. If the equipment has been damaged in

transit, immediately report the extent of damage to the transportation company and to PairGain. Order

replacement equipment, if necessary.

•Check the packing list to ensure complete and accurate shipment of each listed item. If the shipment is short

or irregular, contact PairGain as described in the Warranty. If you must store the equipment for a prolonged

period, store the equipment in its original container.

Notes indicate information about special circumstances.

Cautions indicate the possibility of equipment damage or the possibility of personal injury.

You must wear an antistatic wrist strap connected to the ESD jack on thePG-Flex chassis to

perform the installation procedures. You must also observe normal ESD precautions when

handling electronic equipment. Do not hold electronic plugs by their edge. Do not touch

components or circuitry.

Inspecting Your Shipment 363-704-121-01, Revision 01

iv July 30, 1999 FLC-704 List 2A

363-704-121-01, Revision 01 Table of Contents

FLC-704 List 2A July 30, 1999 v

TABLE OF CONTENTS

Overview ____________________________________________________________________________ 1

Description and Features....................................................................................................................1

Front Panel .........................................................................................................................................2

Specifications.....................................................................................................................................3

Functional Description_________________________________________________________________ 4

Subscriber Drop Testing ....................................................................................................................4

Installation and Test___________________________________________________________________ 6

Unpacking the FLC-704.....................................................................................................................6

Turn-Up and Testing..........................................................................................................................6

Troubleshooting .................................................................................................................................6

Abbreviations ________________________________________________________________________ 8

Product Support ______________________________________________________________________ 9

Technical Support..............................................................................................................................9

Warranty.............................................................................................................................................9

FCC Compliance..............................................................................................................................10

Modifications ...................................................................................................................................10

Table of Contents 363-704-121-01, Revision 01

vi July 30, 1999 FLC-704 List 2A

363-704-121-01, Revision 01 Overview

FLC-704 List 2A July 30, 1999 1

OVERVIEW

This practice describes, and defines the features and specifications for the PairGain®PG-Flex®FLC-704 List 2A

Channel Unit.

DESCRIPTION AND FEATURES

The FLC-704 provides eight Plain Old Telephone Service (POTS) interfaces between the Central Office and the

PG-Flex, and uses A-Law pulse code modulation (PCM) encoding. The FLC-704 Channel Unit includes green

status LEDs for each line indicating idle, ringing, and off-hook conditions, as well as a red LED indicating a fault

condition. The channel unit provides metallic test access to the subscriber line connection through an optional

metallic bypass pair.

Features of the PG-Flex FLC-704 COT Channel Unit:

•eight POTS subscriber interfaces

•64 kbps A-Law PCM encoding

•metering tones (12 kHz, 16 kHz)

•front panel ACTIVE LEDs indicate idle, ringing, metallic test access, and off-hook for each channel

•front panel FAULT LED indicator simplifies troubleshooting.

Overview 363-704-121-01, Revision 01

2 July 30, 1999 FLC-704 List 2A

FRONT PANEL

Figure 1 shows the FLC-704 front panel. Table 1 lists the different states and indications for the FLC-704 front

panel LEDs.

Figure 1. FLC-704 Front Panel

Table 1. FLC-704 Front Panel LEDs

LED LED State Indicates

Solid green Channel is off hook.

ACTIVE Fast flashing green Channel is in test access mode.

(1 through 8) Slow flashing green Channel is ringing.

Off Channel is on hook.

FAULT Red Fault detected by the unit. Refer to

Table 2 for troubleshooting procedures.

Off No faults detected.

PairGain

FLC 704

CHAN UNIT

LIST

FAULT

Status LEDs

Fault LED

363-704-121-01, Revision 01 Overview

FLC-704 List 2A July 30, 1999 3

SPECIFICATIONS

Electrical Characteristics

Analog Impedance.........................................600 Ω

Loop Resistance.............................................100 Ω(CO switch to COT)

End-to-End Loss............................................-2.5 dB ±1.0 dB

DC Off-Hook Current....................................30 mA

Channel Signature

Tip-Ring .................................................475 kΩ, 1%

Tip-Ground.............................................332 kΩ, 1%

Ring-Ground...........................................(open)

COT 20 Hz Input Impedance.........................0.5 REN

Environmental

Operating Elevation.......................................-200 ft. to 13,000 ft (-60 m to 4,000 m)

Temperature and Humidity............................-40° F to +150° F (-40° C to +65° C) 5% to 95% (non condensing)

Physical

Weight............................................................0.8 lb (0.4 kg)

Dimensions

Height .....................................................6.75 in. (17.2 cm)

Width ......................................................1.00 in. (2.5 cm)

Depth ......................................................10.50 in. (26.7 cm)

Functional Description 363-704-121-01, Revision 01

4 July 30, 1999 FLC-704 List 2A

FUNCTIONAL DESCRIPTION

The FLC-704 provides eight POTS interfaces to the CO switch. The unit performs the interface function between

the analog POTS circuit and the internal digital PCM bus. In addition, each channel unit:

•converts analog signals to 64 kbps A-Law PCM digital format

•detects ringing voltage

•detects loop current feed

•detects forward disconnect

•detects a subscriber test access signal

•detects metering tones

•provides loop closure.

A block diagram of the FLC-704 is shown in Figure 3. One 8-Channel COT Channel Unit supports eight POTS

interfaces.

A status LED is associated with each line to indicate whether the line is off-hook, idle, ringing, or being tested. A

common fault LED indicates a general fault has been detected on the card and it should be replaced.

Test access connections to a specific line circuit are made through the maintenance terminal or by the CO switch

applying the appropriate voltages on the subscriber line as described in the “Subscriber Drop Testing” section.

SUBSCRIBER DROP TESTING

For subscriber drop testing from the CO, PG-Flex is able to select and connect any subscriber drop to a metallic

test pair at the RT. PG-Flex extends this connection back to the COT where technicians can switch it onto a test

access bus, or to the corresponding subscriber line on the COT channel card.

Metallic access is performed by momentarily placing +116 Vdc (from the CO) on the subscriber’s Tip lead. (The

Ring lead should be between GND and the Tip value.) Depending on the PG-Flex system configuration, the

selected subscriber drop (assuming a working metallic bypass pair)connects to the corresponding COTsubscriber

line.

The metallic connection drops when -116 Vdc is momentarily applied to the subscriber’s COT Tip.

Metallic access may also be activated through and ASCII terminal connected to the RS-232 Craft Maintenance

port located on the front of the FLL-716 line unit or through the FAU-728 or FPI-729 units.

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