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
2A
A
C
T
I
V
E
1
2
3
4
5
6
7
8

363-704-121-01, Revision 01
ii July 30, 1999 FLC-704 List 2A
Revision History of This Practice
©Copyright 1999 PairGain Technologies, Inc.
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
2A
A
C
T
I
V
E
1
2
3
4
5
6
7
8
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.