PairGain FLC-703 Manuel utilisateur

PG-FLEX EIGHT CHANNEL

CENTRAL OFFICE TERMINAL

LOOP START/GROUND START UNIT

Model List Number Part Number CLEI Code

FLC-703 4B 150-1303-42 VACHLHGC--

PAIRGAIN TECHNOLOGIES, INC.

ENGINEERING PLANT SERIES TECHNICAL PRACTICE

SECTION 363-703-142-01

Section 363-703-142 July 30, 1999 Revision 01

ii PairGain Engineering - Plant Series FLC-703, List 4B

Revision History of this practice.

Revision 01—July 30, 1999 Initial Release.

USING THIS TECHNICAL PRACTICE

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

A note informs you of special circumstances.

A caution indicates the possibility of equipment damage.

A warning indicates the possibility of personal injury.

A. PRODUCT OVERVIEW................................................................................................................ 1

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

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

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

B. Functional Description..................................................................................................................... 4

4. Applications...................................................................................................................... 4

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

C. INSTALLATION AND TEST........................................................................................................ 6

6. Unpacking......................................................................................................................... 6

7. Installation........................................................................................................................ 6

8. Troubleshooting................................................................................................................ 7

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

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

E. Certification and warranty............................................................................................................. 9

10. Certification.................................................................................................................... 9

11. Warranty........................................................................................................................ 10

F. Abbreviations................................................................................................................................. 11

12. Abbreviations................................................................................................................. 11

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

Revision 01 July 30, 1999 Section 363-703-142

FLC-703, List 4B PairGain Engineering - Plant Series Page 1

A. PRODUCT OVERVIEW

1. Description and Features

1.1 The PairGain®PG-Flex®FLC-703 List 4B Channel Unit provides eight loop start or ground start

channel interfaces for POTS between a PG-Flex Central Office Terminal (COT) and the Central

Office (CO) switch. You can provision each of the eight circuits separately for either loop start or

ground start services. Provisioning is done through the PG-Flex Line Unit Maintenance port.

The FLC-703 unit provides metallic test access to the subscriber line connection through an optional

metallic bypass pair. Perform metallic bypass testing either manually or through the Pair Gain Test

Controller (PGTC).

1.2 Features of the FLC-703 COT Channel Unit are:

•eight loop start or ground start POTS subscriber interfaces

•64 kbps µ-Law Pulse Code Modulation (PCM) encoding

•front panel ACTIVE LEDs

•front panel FAULT LED

•PGTC compatibility

•Custom Local Area Signaling Services (CLASS) support (i.e., caller ID)

•line-side answer supervision support (reverse battery)

•forward disconnect

•distinctive ringing

•connection for a subscriber loop to a metallic bypass test pair

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

Section 363-703-142 July 30, 1999 Revision 01

Page 2 PairGain Engineering - Plant Series FLC-703, List 4B

2. Front Panel

2.1 Figure 1 shows the FLC-703 front panel. Table 1 lists the different states and indications for the

FLC-703 Channel Unit front panel LEDs.

Figure 1. FLC-703 Front Panel

Table 1. FLC-703 Front Panel LEDs

LED LED State Indicates

Solid green Channel is off hook.

ACTIVE Fast flashing green Channel is in test.

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

Off Channel is on hook.

FAULT Red Fault detected by the unit.

Off No faults detected.

Revision 01 July 30, 1999 Section 363-703-142

FLC-703, List 4B PairGain Engineering - Plant Series Page 3

3. Specifications

Electrical Characteristics

Analog Impedance...................................... 900 Ω

Loop Length............................................... 100 ft (CO switch to COT)

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

Ring-Ground Resistance............................. 500 Ω

Channel Signature ...................................... Loop Start Lines Ground Start Lines

Tip-Ring.............................................. (open) 23.75 kΩ, 1%

Tip-Ground.......................................... 162 kΩ, 1% 162 kΩ, 1%

Ring-Ground........................................ 226 kΩ, 1% 226 kΩ, 1%

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)

Section 363-703-142 July 30, 1999 Revision 01

Page 4 PairGain Engineering - Plant Series FLC-703, List 4B

B. FUNCTIONAL DESCRIPTION

4. Applications

4.1 The FLC-703 provides service to one of the following configurations:

•eight independent loop start subscriber lines or

•eight ground start Private Branch Exchange (PBX) lines or

•a mixture of both loop start subscriber lines and ground start PBX lines

Figure 2 shows a typical system with loop start and ground start services.

Figure 2. Typical System with Loop Start and Ground Start Capabilities

5. Operational Capabilities

5.1 FLC-703 Functions. The FLC-703 Channel Unit provides eight POTS channel interfaces to the

CO switch. Each FLC-703 detects:

•forward battery

•ringing voltage

•reverse battery

•Tip ground

5.2 Circuit Operation. The following paragraphs define the FLC-703 circuit operation when using

loop start for subscriber lines or ground start for PBX lines. Each FLC-703 circuit has an associated

LED that indicates when the line is off-hook, idle, ringing, or under test. See Table 1.

Revision 01 July 30, 1999 Section 363-703-142

FLC-703, List 4B PairGain Engineering - Plant Series Page 5

5.2.1 Loop start idle condition is a Ring lead negative and Tip lead positive from the Central Office

Terminal (COT) with the same conditions out of the RT toward the subscriber. The following occurs

when the calling line goes off-hook:

•loop current flows and is detected by the FRC-753

•FLC-703 receives an off-hook signal from the RT

•FLC-703 generates an off-hook signal to the Central Office (CO) to begin current flow

•CO sends dial tone

•FRC-753 recognizes dial pulses or Dual Tone Multi Frequency (DTMF) signaling, from the

subscriber and forwards these as loop current breaks, dialing or DTMF signaling, at the CO

The following occurs for an incoming call:

•FLC-703 detects a ringing signal from the CO

•FLC-703 signals the FRC-753 which then connects ringing to the subscriber

•subscriber line goes off-hook and the FRC-753, via the FLC-703, signals the CO to disconnect

ringing and establish an audio path

5.2.2 Ground start idle condition is a Tip lead open and Ring lead negative into the CO and Tip lead open

and Ring lead negative at the RT. The following occurs when a PBX requests service for an

outgoing call by grounding the Ring lead at the RT:

•FRC-753 signals the FLC-703

•FLC-703 operates a Ring ground relay that requests dial tone from the CO (this makes the

circuit busy, or seizes it, for outgoing calls to prevent others from using it, i.e., prevents glare

where different users can seize a line at the same time)

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

•FLC-703 detects Tip ground, closes the loop between Tip and Ring, and signals the FRC-753 to

send Tip ground to the PBX

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

The following occurs for an incoming call:

•FLC-703 detects a ringing signal from the CO, along with Tip ground

•FLC-703 signals the FRC-753 which then connects Tip ground and ringing to the PBX

•PBX goes off-hook and the FRC-753, via the FLC-703, signals the CO to disconnect ringing and

establish an audio path

5.2.3 When caller ID (a CLASS feature) is activated, the CO generates a signal to the subscriber between

the first and second bursts of the ringing signal only (i.e., PG-Flex supports on-hook transmission).

The forward-disconnect function releases a called line that was left on hold or an answering set that

requires a loop open to be able to turn off.

Section 363-703-142 July 30, 1999 Revision 01

Page 6 PairGain Engineering - Plant Series FLC-703, List 4B

C. INSTALLATION AND TEST

6. Unpacking

6.1 Upon receipt of the equipment, proceed as follows:

1Unpack 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.

2Check the contents versus the packing list to ensure complete and accurate shipment. If the

shipment is short or irregular, contact PairGain as described in Section 11. If you must store the

equipment for a prolonged period, store the equipment in its original container.

7. Installation

Observe normal electrostatic discharge precautions when handling electronic

equipment. Do not hold electronic plug-ins by their edge. Do not touch

components or circuitry.

7.1 Install the FLC-703. Insert the FLC-703 into the shelf and observe that all LEDs:

•turn ON for approximately 2 seconds

•scan from top to bottom

•turn OFF

If the LEDs do not follow the above sequence, see Table 1.

Use List 3 or higher PG-Flex CO and RT Line Units when activating the ground

start feature.

7.2 Provision the FLC-703. Provision the FLC-703 using the FLL-712 List 3 CO Line Unit practice.

For each channel provisioned, select loop start or ground start.

7.3 Connect Cabling. Place a cross-connect (jumper) from the CO to the appropriate PairGain

COT shelf termination for the FLC-703 circuit(s) selected.

Revision 01 July 30, 1999 Section 363-703-142

FLC-703, List 4B PairGain Engineering - Plant Series Page 7

7.4 Verify Operation. Verify the following after the system is powered up and HDSL communication

is synchronized:

1Observe the front panel ACTIVE indicators are all OFF and the FAULT indicator is off (no calls

are in progress).

2Test circuits for loop start:

aPlace an outgoing call for each subscriber circuit provisioned and observe that the

appropriate ACTIVE LED tracks the progress of the call (Table 1).

bPlace an incoming call for each subscriber circuit provisioned and observe that the

appropriate ACTIVE LED tracks the progress of the call (Table 1).

3Test circuits for ground start (circuits must be provisioned for ground start per section 7.2):

aPlace an outgoing call for each subscriber circuit provisioned and observe that the

appropriate ACTIVE LED tracks the progress of the call (Table 1).

bPlace an incoming call for each subscriber circuit provisioned and observe that the

appropriate ACTIVE LED tracks the progress of the call (Table 1).

8. Troubleshooting

8.1 Subscriber Drop Testing. For PG-Flex subscriber drop testing from the CO, select and connect

any subscriber drop to a metallic test pair at the RT. PG-Flex extends this connection to the COT

where it can be switched onto the test access bus or to the corresponding subscriber line on the COT

channel card.

Activate test access through the RS-232 maintenance port located on the front of the COT Line Unit

using an ASCII terminal.

8.2 Table 2 provides PG-Flex system troubleshooting procedures based on indications displayed by the

FLC-703 Channel Unit front panel LEDs or customer reported problems.

Section 363-703-142 July 30, 1999 Revision 01

Page 8 PairGain Engineering - Plant Series FLC-703, List 4B

Table 2. FLC-703 COT Channel Unit Troubleshooting

Indication Problem Action

FAULT LED

ON The FLC-703 processor has

detected a fault. Remove and re-insert the Channel Unit. If the FAULT LED does not

extinguish, replace the Channel Unit.

Troubleshooting based on customer-originated trouble reports

No Dial tone,

Can’t Dial

• faulty RT or COT

Channel Unit

• facility short/open

• CO switch problem

1Lift the subscriber pair at the network interface. If dial tone is present

and you can place a call, refer the problem to the customer per local

practice.

2If you cannot hear dial tone or cannot place a call at the network

interface (with the subscriber pair lifted), check for dial tone at the RT.

If dial tone is present, check the pair between the RT and the network

interface. If no dial tone is present, replace the RT Channel Unit.

3If the problem still exists, re-insert the original RT Channel Unit and

replace the COT Channel Unit. Test for operation.

4If the problem still exists, refer the problem to the CO switch.

Phone Doesn’t

Ring

• high-resistance

subscriber line short

• faulty RT or CO

Channel Unit

• loop length too long

1Lift the subscriber pair at the network interface. If ringing is present,

refer the problem to the customer per local practice.

2If ringing is not present, check for ringing at the RT. If ringing is

present, check the pair between the RT and the network interface. If no

ringing is present, replace the RT Channel Unit. If ringing is still not

present, check a circuit on another Channel Unit. If ringing is still not

present, replace the Line Unit.

3If ringing is still not present at the RT, re-insert the original Channel

Unit and Line Unit. Test for ringing at the COT.

4Test for ringing into the COT from the CO switch. If no ringing is

present, refer the trouble to the CO switch. If ringing is present, replace

the COT Channel Unit. Test again for ringing at the network interface.

If ringing is still not present, contact PairGain technical assistance per

section 9.

5Verify the resistance of the copper loop between the RT Enclosure and

the network interface is less than 530 Ω.

Phone doesn’t

stop ringing

• faulty subscriber

instrument

• faulty RT Channel Unit

• loop length too long

1Test for ring trip at the network interface. If the ringing is tripped, refer

the trouble to the customer per local practice.

2If the ringing is not tripped, test for tripping at the RT. If ring trip does

occur, check the loop for excessive length. If ring trip does not occur,

replace the RT Channel Unit. If ring trip still does not occur, contact

PairGain technical assistance per section 9.

3Verify the resistance of the copper loop between the RT Enclosure and

the network interface is less than 530 Ω.

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