PairGain PG-Flex FLC-704 User manual

PG-FLEX 8 CHANNEL

CENTRAL OFFICE TERMINAL

LOOP START/GROUND START POTS UNIT

PAIRGAIN TECHNOLOGIES, INC.

ENGINEERING SERVICES TECHNICAL PRACTICE

™363-704-104-01,¨

SECTION 363-704-104-01

Model List Number Part Number

FLC-704 4 150-1304-04

363-704-104-01, Revision 01

ii June 22, 1998 FLC-704 List 4

Revision History of This Practice

PairGain is a registered trademark, and PG-Flex is a trademark of PairGain Technologies, Inc.

Information contained in this document is company private to PairGain Technologies, Inc., and shallnot 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 June 22, 1998 Initial Release

363-704-104-01, Revision 01 Using This Technical Practice

FLC-704 List 4 June 22, 1998 iii

USING THIS TECHNICAL PRACTICE

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

Notes contain information about special circumstances.

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

Table of Contents 363-704-104-01, Revision 01

iv June 22, 1998 FLC-704 List 4

TABLE OF CONTENTS

Product Overview_____________________________________________________________________ 1

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

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

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

Operational Capabilities.................................................................................................................... 4

Circuit Operation............................................................................................................................... 4

Loop Start Operation........................................................................................................... 4

Ground Start Operation....................................................................................................... 6

CLASS Features..................................................................................................................7

Forward Disconnect............................................................................................................ 7

Installation and Test___________________________________________________________________ 8

Unpacking.......................................................................................................................................... 8

Installing............................................................................................................................................ 8

Provisioning....................................................................................................................................... 8

Verify Installation.............................................................................................................................. 9

Troubleshooting............................................................................................................................... 10

Product Support _____________________________________________________________________ 11

Technical Support............................................................................................................................ 11

Warranty.......................................................................................................................................... 11

FCC Compliance............................................................................................................................. 12

Modifications................................................................................................................................... 12

Abbreviations _______________________________________________________________________ 13

363-704-104-01, Revision 01 Product Overview

FLC-704 List 4 June 22, 1998 1

PRODUCT OVERVIEW

This section provides a product description, and defines the features and specifications for the PairGain®

PG-Flex™ FLC-704 List 4 Central Office Terminal (COT) Channel Unit.

Description and Features

The FLC-704 List 4 channel unit provides eight loop start or ground start channel interfaces for Plain Old

Telephone Service (POTS) between a PG-Flex COT and the Central Office (CO) switch using A-Law pulse code

modulation (PCM) encoding. In addition, the FLC-704 List 4 provides metallic access to the subscriber line

connection through an optional metallic bypass pair for subscriber circuit testing.

Features of the PG-Flex FLC-704 List 4 COT channel unit are:

•eight loop start or ground start POTS subscriber interfaces

•64 kbps A-Law PCM encoding

•meter tones (12 kHz, 16 kHz)

•front panel ACTIVE LEDs indicate on-hook (idle), ringing, metallic access, and off-hook condition for each

channel

•front panel FAULT LED indicator simplifies troubleshooting

•Pair Gain Test Controller (PGTC) compatibility

•Custom Local Area Signaling Services (CLASS) support (such as, caller ID)

•line-side answer supervision support (reverse battery)

•forward disconnect

•distinctive ringing

•metallic access for subscriber circuit testing

•repeat of loop off-hook, ground start seizure, and Ring-Trip conditions to the CO switch

Product Overview 363-704-104-01, Revision 01

2 June 22, 1998 FLC-704 List 4

Front Panel

The FLC-704 List 4 front panel (Figure 1) includes green status LEDs for each line indicating on-hook (idle),

ringing, and off-hook conditions, as well as a red LED indicating a fault condition on the channel unit. Table 1

lists the different states and indications for the FLC-704 channel unit front panel LEDs.

Figure 1. FLC-704 List 4 Front Panel

Table 1. FLC-704 List 4 Front Panel LEDs and Labels

LED and Label Function

Solid green: Channel is off-hook.

ACTIVE

(1 through 8)

Fast flashing green: Channel is in test access mode.

Slow flashing green: LED follows the ring signal.

Off: Channel is on-hook (idle).

FAULT Red: Fault detected by the unit. Refer to Table 10 on page 10 for troubleshooting procedures.

Off: No faults detected.

Warranty Control

Number Label

Indicates the beginning year and month of the equipment warranty. Also indicates the unit

revision number. For example, a warranty control number of “71203” indicates a warranty

beginning 1997 (7), in December (12), and the revision is “03.”

Bar Code Label Contains the serial number and part number of the equipment in both bar code and text formats.

PairGain

FLC 704

CHAN UNIT

LIST

FAULT

Status LEDs

Fault LED

Warranty control

number label

Bar code label

363-704-104-01, Revision 01 Product Overview

FLC-704 List 4 June 22, 1998 3

Specifications

Electrical Characteristics

Analog Impedance 600 Ω

Loop Resistance 100 Ω, (CO switch to COT) maximum

End-to-End Loss –2.5 dB ±1.0 dB at 100 Hz

Ring-Ground Resistance 500 Ω

Channel Signature Loop Start Lines Ground Start Lines

Tip-Ring (open) 23.75k Ω, 1%

Tip-Ground 162k Ω, 1% 162k Ω, 1%

Ring-Ground 226k Ω, 1% 226k Ω, 1%

Environmental

Operating Elevation –200 ft. to 13,000 ft. (–60 m to 4000 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)

Product Overview 363-704-104-01, Revision 01

4 June 22, 1998 FLC-704 List 4

Operational Capabilities

The FLC-704 List 4 channel unit provides eight loop start or ground start POTS interfaces to the CO switch. The

unit performs the interface function between the analog POTS circuit and the internal digital pulse coded

modulation (PCM) bus. In addition, each channel unit:

•detects forward battery

•detects ringing voltage

•detects reverse battery

•detects Tip ground and Tip open

•detects 12 kHz or 16 kHz meter tone

•detects a subscriber test access signal

•provides loop closure

•provides grounded ring lead

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

Circuit Operation

The following paragraphs define the FLC-704 circuit operation when using loop start for subscriber lines or

ground start for PBX lines. Each FLC-704 circuit has an associated LED that indicates when the line is off-hook,

on-hook (idle), ringing, or under test (see Table 1 on page 2 for front panel LED definitions).

Loop Start Operation

The following section summarizes the loop start sequences for on-hook (idle), subscriber inititated outgoing calls,

subscriber received incoming calls, and busy conditions.

On-hook (Idle) Condition. Loop start idle condition is a Ring-lead negative and Tip-lead positive from the CO

with the same condition out of the RT toward the subscriber (see Table 2 for circuit interactions).

Subscriber Initiated Outgoing Call. The following occurs when the calling line goes off-hook (see Table 3

on page 5 for circuit interactions):

•loop current flows and is detected by the FLC-704 List 4 channel unit

•FLC-704 receives an off-hook signal from the RT

•FLC-704 generates an off-hook condition to the CO switch

•CO sends dial tone

•FRC-754 passes a dial pulse or Dual Tone Multi Frequency (DTMF) signal through the FLC-704 from the

subscriber and forwards these to the CO

Table 2. Circuit Interactions for an Idle Condition (Loop Start)

Operation CO Switch FLC-704 List 4 COCU FRL-754 List 4 RTCU Subscriber

Circuit Idle No ringing ⇒No ringing ⇒

⇐On-hook ⇐On-hook

363-704-104-01, Revision 01 Product Overview

FLC-704 List 4 June 22, 1998 5

Subscriber Receives Incoming Call. The following occurs for an incoming call (see Table 4 for circuit

interactions):

•FLC-704 detects a ringing signal from the CO

•FLC-704 signals the FRC-754 which then connects ringing to the subscriber

•subscriber line goes off-hook and the FRC-754, through the FLC-704, provides an off-hook condition to the

CO switch

Busy Condition. Loop start busy condition at the RT is a Ring lead negative and a Tip lead positive with loop

current flowing. The same conditions occurs at the CO (see Table 5 for circuit interactions).

Table 3. Circuit Interactions When a Subscriber Initiates an Outgoing Call (Loop Start)

Operation CO Switch FLC-704 List 4 COCU FRL-754 List 4 RTCU Subscriber

CO Idle No ringing ⇒No ringing ⇒

Subscriber goes

off-hook ⇐Off-hook ⇐Off-hook

CO returns dialtone Dialtone ⇒Dialtone ⇒

Subscriber Dials ⇐DP or DTMF ⇐DP or DTMF

Table 4. Circuit Interactions When a Subscriber Receives an Incoming Call (Loop Start)

Operation CO Switch FLC-704 List 4 COCU FRL-754 List 4 RTCU Subscriber

Subscriber Idle ⇐On-hook ⇐On-hook

CO generates ringing Ringing ⇒Ringing ⇒

Subscriber goes

off-hook ⇐Off-hook ⇐Off-hook

Ring trip No ringing ⇒No ringing ⇒

Table 5. Circuit Interactions for a Busy Condition (Loop Start)

Operation CO Switch FLC-704 List 4 COCU FRL-754 List 4 RTCU Subscriber

Circuit busy No ringing ⇒No ringing ⇒

⇐Off-hook ⇐Off-hook

Product Overview 363-704-104-01, Revision 01

6 June 22, 1998 FLC-704 List 4

Ground Start Operation

The following section summarizes the ground start sequences for on-hook (idle), subscriber inititated outgoing

calls, subscriber received incoming calls, and busy conditions.

Idle Condition. Ground start idle condition is a Tip-lead open and Ring-lead negative from the CO andTip lead

open and Ring-lead negative at the RT (see Table 6 for circuit interactions).

Subscriber Initiates Outgoing Call. The following occurs when a PBX requests service for an outgoing call

(see Table 7 for circuit interactions):

•PBX grounds Ring lead at the RT

•FRC-754 signals the FLC-704

•FLC-704 operates a Ring-ground relay that requests dial tone from the CO (this makes the circuit busy, or

seizes it, for outgoing calls, and blocks any incoming calls prior to the PBX dialing (that is, it prevents glare

where incomingand outgoing calls may occursimultaneously on the same line). Glare occurswhen both ends

of a telephone line or trunk are seized at the same time.

•CO sends dial tone and grounds the Tip to signal the PBX to begin dialing

•FLC-704 detects Tip-ground, closes the loop between Tip and Ring, and signals the FRC-754 to send Tip

ground to the PBX

•PBX removes the original Ring-ground condition and completes the loop (Tip and Ring)

Table 6. Circuit Interactions for an Idle Condition (Ground Start)

Operation CO Switch FLC-704 List 4 COCU FRL-754 List 4 RTCU Subscriber

Circuit Idle Tip - no ground

No ringing ⇒Tip - no ground

No ringing ⇒

⇐Ring - no ground

On-hook ⇐Ring - no ground

On-hook

Table 7. Circuit Conditions When a Subscriber Initiates an Outgoing Call (Ground Start)

Operation CO Switch FLC-704 List 4 COCU FRL-754 List 4 RTCU Subscriber

CO Idle Tip - No ground

No ringing ⇒Tip - No ground

No ringing ⇒

Subscriber requests

dialtone ⇐Ring - ground

On-hook ⇐Ring - ground

On-hook

CO returns dialtone Tip - ground

Dialtone ⇒Tip - ground

Dialtone ⇒

Subscriber Dials ⇐Ring - no ground

Off-hook

DP or DTMF

⇐Ring - no ground

Off-hook

DP or DTMF

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