CopperOptics PairGain PG-FLEX PLUS PRL-770 List 2E User manual

PG-FLEXPLUS
PAIRGAIN TECHNOLOGIES, INC.
ENGINEERING SERVICES TECHNICAL PRACTICE
™950-779-115-020¨
SECTION 950-779-115-02
Indoor Remote Terminal
Enclosure
PRL-770 List 2E
PRL-779 List 1E
Part Number: 150-1670-52
150-1679-51
CLEI Code: S9MSBA0A
S9MSEH0A
PG-Flex
REMOTE
TERMINAL
Plus

950-779-115-02, Revision 02
ii March 17, 2000 PRL-770 and PRL-779 List 1E and 2E
Revision History of This Manual
©Copyright 2000 PairGain Technologies, Inc.
PairGain and PG-Flex are registered trademarks, and PG-FlexPlus, The Power Behind DSL Access and the PairGain logo design
are trademarks of PairGain Technologies, Inc. No right, license, or interest to such trademarks is granted hereunder, and you agree
that you shall assert no such right, license, or interest with respect to such trademark. All other product names mentioned in this
document are used for identification purposes only and may be trademarks or registered trademarks of their respective companies.
Information containedin this document is company private to PairGain Technologies, Inc.and shall not bemodified, used, copied,
reproduced or disclosed in whole or in part without the written consent of PairGain.
Revision Release Date Revisions Made
01 December 13, 1999 Initial release.
02 March 17, 2000 Add 4 POTS support information and change reference label graphics.

950-779-115-02, Revision 02 Using This Technical Practice
PRL-770 and PRL-779 List 1E and 2E March 17, 2000 iii
USING THIS TECHNICAL PRACTICE
Three types of 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 “Limited Warranty” on page 16. 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.
The ESD Susceptibility symbol indicates that a device or assembly is susceptible to damage
from electrostatic discharge.

Inspecting Your Shipment 950-779-115-02, Revision 02
iv March 17, 2000 PRL-770 and PRL-779 List 1E and 2E

950-779-115-02, Revision 02 Table of Contents
PRL-770 and PRL-779 List 1E and 2E March 17, 2000 v
TABLE OF CONTENTS
Overview ____________________________________________________________________________ 1
Integrated Channel Testing................................................................................................................1
Metallic Fallback................................................................................................................................2
Specifications.....................................................................................................................................2
Installation and Turn-up _______________________________________________________________ 4
Required Tools and Test Equipment..................................................................................................4
Preparing the RT................................................................................................................................5
Mounting the RT................................................................................................................................5
Wall Mounting.....................................................................................................................5
Line-up Mounting................................................................................................................7
Wiring the RT ....................................................................................................................................9
Turn up and Testing.........................................................................................................................12
Fault Isolation_______________________________________________________________________ 12
COLU Fault Indicators.....................................................................................................................12
Subscriber Reported Faults..............................................................................................................13
Abbreviations _______________________________________________________________________ 15
Product Support _____________________________________________________________________ 16
Technical Support............................................................................................................................16
Limited Warranty.............................................................................................................................16
Advance Replacement......................................................................................................................17
Billing...............................................................................................................................................17
Returning A Product ........................................................................................................................17
FCC Compliance..............................................................................................................................18
Modifications...................................................................................................................................18

Table of Contents 950-779-115-02, Revision 02
vi March 17, 2000 PRL-770 and PRL-779 List 1E and 2E

950-779-115-02, Revision 02 Overview
PRL-770 and PRL-779 List 1E and 2E March 17, 2000 1
OVERVIEW
The PairGain®PG-FlexPlus ™ PRL-770 List 2 E and PRL-779 List 1 E, provides interfaces for LS/GS POTS
subscribers. The PRL-779 supports Loop Start and Ground Start (LS/GS) POTS, allows Tip and Ring polarity
reversal for support of Millennium pay phones, and implements TR-08 channel testing. The PRL-770 is a 4 LS
Indoor Remote Terminal Enclosure, and the PRL-779 is a 6 LS/GS Indoor Remote Terminal Enclosure.
A PG-FlexPlus system provides bidirectional transport of multiple DS0s over a single, unconditioned wire pair
using HDSL technology. Using an existing cable, PG-Plus provides for higher bandwidth needs of residential and
business customers by providing multiple LS/GS interfaces on a single HDSL twisted-pair wire. Figure 1 shows
a minimally configured PG-Plus application that consists of one COT shelf, one COLU, and one RT.
Figure 1. Typical PG-Plus Application
Each COLU housed in a COT shelf interfaces with a corresponding RT. LS/GS or digital lines from a CO
switching system connect to the COT shelf and are sent by means of the COLU and the HDSL wire pair to an RT.
As an example, a 23-inch COT shelf can interface withsixteen different RTs providingup to sixLS/GS lines each,
for as many as 96 subscriber lines. The COT shelf operates on standard -48 Vdc CO battery and supplies power
to the RT, eliminating the need and expense of providing local power at the RT. A PG-Plus system with HDSL
transmission and line-powered RTs results in fast, cost-effective solutions to LS/GS deployment over minimal
copper facilities.
INTEGRATED CHANNEL TESTING
The LS/GS RT supports channel testing as described in TR-TSY-000008 and TR-TSY-000465 when the PG-Plus
system is configured to interface to a TR-08 compliant digital switch. During the channel test, a sequence of
hand-shaking messages and tones are exchanged between the PG-Plus system and the switch, and the LS/GS RT
responds byapplying the appropriate absorptive (600
 ) or reflective (0  )test terminationstotheremotechannel
under test, thus allowing for both transmission and signalling tests to be performed on that specific channel. The
transmission tests verify the transmission parameters, such as channel loss, return loss, and idle channel noise are
within the required limits. The signalling tests, that consist of off-hook detection and a ringing test, ensure that the
channel can detect and produce the correct signalling states. In addition to the channel testing, the LS/GS RT
works in conjunction with the switch to provide subscriber drop testing.
When using a 23-inch COT shelf to interface with sixteen PRL-770 4 LS RTs you can support as
many as 64 subscriber lines.

Overview 950-779-115-02, Revision 02
2 March 17, 2000 PRL-770 and PRL-779 List 1E and 2E
METALLIC FALLBACK
Metallic fallback provides a direct connection from the CO to subscriber number one under fault conditions. The
metallic fallback feature is a provisionable item. You can disable this feature through the user screens.
Service is provided to the subscriber assigned to the LS/GS line in the affected COLU. At the RT, the system exits
metallic fallback and attempts to synchronize if either LS/GS number one or the HDSL Tip to Ring pair is shorted
for at least 3 seconds, and then released for at least 3 seconds. Otherwise, the COLU checks for the presence of
an RT every 5 minutes. If an RT is present, the system begins HDSL synchronization acquisition.
Relays in the COLU and RT under control of the PG-Plus Alarm Unit (PAU) or PG-Plus Management Unit
(PMU) provide a path for subscriber drop test and metallic fallback operation. These relays are used to establish
a path to channel 1 of the LS/GS RT during fault conditions and to provide for drop testing of the selected
subscriber line from the CO location.
SPECIFICATIONS
Power
Voltage Safety A2 compliant per GR-1089-CORE
HDSL Line Input Voltage +/-135 Vdc Tip to Ring, maximum
HDSL Line Start-up Voltage +/- 100 Vdc Tip to Ring, minimum
RT Input Power 10.2 Watts typical; 11.2 Watts Tip to Ring, maximum with 4 off-hook, 2 ringing
5 REN
HDSL
Line Code 2B1Q
Line Rates
PRL-770 130.6 K symbols/sec; 262 Kbps
PRL-779 196 K symbols/sec (392 K bps), 261.3 Kbps
Line Reach
PRL-770 26 AWG (0.4 mm),15.0 kft (4.57 km)
24 AWG (0.5 mm), 21.7 kft (6.61 km)
22 AWG (0.6 mm), 31.2 kft (9.51 km)
19 AWG (0.9 mm), 49.7 kft (15.1 km)
PRL-779 26 AWG (0.4 mm), 12.5 kft (3.81 km)
24 AWG (0.5 mm), 18.0 kft (5.48 km)
22 AWG (0.6 mm), 25.2 kft (7.68 km)
19 AWG (0.9 mm), 37.8 kft (11.5 km)
Maximum Attenuation
PRL-770 45.9 dB at 65 kHz
PRL-779 41.6 dB at 98 kHz
Environment
Temperature -40  F to +131  F (-40  C to + 55  C)
Humidity 5% to 95% noncondensing
Altitude -200 ft. to 13,000 ft. (-60 m to 4,000 m)
Compliance
Human Safety UL 1950
Emissions Radiation and Immunity GR-1089 Core Class B and FCC Part 15 for Class B compliant

950-779-115-02, Revision 02 Overview
PRL-770 and PRL-779 List 1E and 2E March 17, 2000 3
LS/GS Interface
Analog Impedance 600 
RT supervisory range 300  plus 430  for handset; or 3.5 kft on 26 AWG; 5.7 kft on 24 AWG;
9.2 kft on 22 AWG
Detection of Loop Open >10 k

Idle State Voltage -48 V minimum
Loop Current 23 mA minimum
Ring Generation
PRL-770 Balanced Trapezoidal 40 Vrms minimum @ 20 + 3 Hz up to 5 REN per line
(10 REN total at RT)
PRL-779 Unbalanced Trapezoidal 40 Vrms minimum @ 20 + 3 Hz up to 5 REN per line
(10 REN total at RT)
Ring Trip Removed in 200 ms after Loop Closure
Connectors
HDSL Insulation Displacement Contact (IDC) Connector
LS/GS IDC Connector
Dimensions
Height 9 in. (228.6 mm)
Width 6 in. (152.4 mm)
Depth 1.8 in. (45.7 mm)
Weight
PRL-770 1 lbs. 11 oz. (.76 Kg)
PRL-779 2 lbs. 3 oz. (1 Kg)

Installation and Turn-up 950-779-115-02, Revision 02
4 March 17, 2000 PRL-770 and PRL-779 List 1E and 2E
INSTALLATION AND TURN-UP
To ensure the safety of personnel and equipment, observe the following safety rules:
The installation of an RT, described in the following sections, involves the following procedures:
•Preparing the RT for wiring
•Mounting the RT
•Wiring the RT
•Turn-up and testing
REQUIRED TOOLS AND TEST EQUIPMENT
•LS/GS telephone set
•1/4-inch flat-head screwdriver
•No. 1 Phillips screwdriver
•Insulated-handle 3/8-inch nut driver
•Insulated-handle needlenose pliers
•Insulated-handle wire cutter
The PRL-770 List 2 E and PRL-779 List 1 E are a listed accessory to be used only with PairGain
Model PLL-729 or PLL-735 List 1 or equivalent.
Installation and maintenance to be performed by qualified service personnel only. This RT is to
be installed in a restricted access location.
Be careful when installing or modifying telephone lines. Dangerous voltages can be present. It
is unsafe to install telephone wiring during a lightning storm. Always disconnect all telephone
lines and power connections before servicing or disassembling this equipment.
All wiring external to the product should follow the local wiring codes.
Always treat the HDSL pair as if it were live with high voltage present. Use caution when
installing an HDSL pair that is already connected to a COLU, because dangerous voltages are
present on the HDSL pair.
The COLU, unless previously disabled by means of craft provisioning, periodically attempts to
power up the RT by applying +/-130 Vdc to the HDSL pair. The COLU also initiates a start-up
after a short of at least 3 seconds has been applied to the HDSL pair. The COLU responds with
start-up voltage 3 seconds after removal of the short.

950-779-115-02, Revision 02 Installation and Turn-up
PRL-770 and PRL-779 List 1E and 2E March 17, 2000 5
PREPARING THE RT
HDSL and subscriber wiring are threaded through the Insulation Displacement Contact (IDC) connector located
on the right-hand side of the RT. Use either the wall mounting or the line-up template provided in the Mounting
Kit for the RT wall positioning.
The RT is now prepared for mounting.
MOUNTING THE RT
The PRL-770 and PRL-779 are suitable for mounting on a wall or line-up. Wall mounting is preferable.
Wall Mounting
Use the back panel of the enclosure, or the enclosed hole pattern drawing as a template for marking the locations
of mounting holes as shown in Figure 2.
Figure 2. Wall Mounting Dimensions
Before setting up the equipment, select a location that will allow sufficient access to wiring
connections from the telco access door.

Installation and Turn-up 950-779-115-02, Revision 02
6 March 17, 2000 PRL-770 and PRL-779 List 1E and 2E
Use the two No. 6 x 1-inch wood screws provided in the Mounting Kit to attach the RT to the wall of the restricted
access area (see Figure 3).
Figure 3. Wall Mounting the RT
PG-Flex
REMOTE
TERMINAL
Plus

950-779-115-02, Revision 02 Installation and Turn-up
PRL-770 and PRL-779 List 1E and 2E March 17, 2000 7
Line-up Mounting
Use the back panel of the enclosure, or the enclosed hole pattern drawing as a template for marking the locations
of mounting holes as shown in Figure 4.
Figure 4. Line-up Mounting Dimensions

Installation and Turn-up 950-779-115-02, Revision 02
8 March 17, 2000 PRL-770 and PRL-779 List 1E and 2E
Use the two No. 6 x 1-inch wood screws provided in the Mounting Kit to attach the RT to the side of the restricted
access area (see Figure 5).
Figure 5. Line-up Mounting the RT
PG-Flex
REMOTE
TERMINAL
Plus

950-779-115-02, Revision 02 Installation and Turn-up
PRL-770 and PRL-779 List 1E and 2E March 17, 2000 9
WIRING THE RT
Wiring the RT consists of three major steps:
•attaching the frame ground wire
•attaching the HDSL Tip and Ring wires
•attaching the subscriber line wires
During installation, refer to the RT Reference label (see Figure 6) affixed inside the Telco Access door. The
Reference label identifies the Frame Ground and HDSL Tip and Ring, and the Subscriber Line wires.
Figure 6. Reference Label
Before setting up the equipment, select a location that will allow sufficient access to wiring
connections from the telco access door.

Installation and Turn-up 950-779-115-02, Revision 02
10 March 17, 2000 PRL-770 and PRL-779 List 1E and 2E
Attaching the Frame Ground, HDSL and Subscriber Line Wires
To install the RT wires, do the following:
1Open the Telco Access door as shown in Figure 7.
Figure 7. Opening the Telco Access Door
2Insert the Tip and Ring wires through the hole below the Telco Access door.
This RT does not provide primary protectors on the HDSL or subscriber pairs. The primary
protection for HDSL pairs must be an integral part of the premises wiring. If the subscriber
wiring is routed outside of the premises for any reason, then primary protection for subscriber
pairs must also be an integral part of the premise wiring.
Access door
Latch
PG-Flex
REMOTE
TERMINAL
Plus
DSLGNDL6L2 L4 L5L1 L3
TRTRTRTR

950-779-115-02, Revision 02 Installation and Turn-up
PRL-770 and PRL-779 List 1E and 2E March 17, 2000 11
3For the FGND and Subscriber Line wires, pivot the IDC connector upward, then insert the wire pair through
the tip and ring holes (see Figure 8). Each wire entry hole accepts one unstripped solid copper wire 22-24
American Wire Gauge (AWG) with a maximum insulation diameter of 1.52 mm.
Figure 8. Attaching the RT Wires
4Press the IDC connector downward to secure the FGND and Subscriber Line wires (see Figure 9).
Figure 9. Attaching the FGND, HDSL and Subscriber Line wires
5Repeat steps 2 through 4 to attach the HDSL wires.
6Close the Telco Access door.

Fault Isolation 950-779-115-02, Revision 02
12 March 17, 2000 PRL-770 and PRL-779 List 1E and 2E
TURN UP AND TESTING
To continue the installation of your PRL-770 and PRL-779 for readiness:
1Ensure that at least one COLU is installed into the PG-FlexPlus COT shelf. Refer to the appropriate COLU
Technical Practice for verifying the COLU installation.
2Locate the HDSL Tip and Ring on the protector block or punchdown, apply a short between the HDSL Tip
and Ring conductors for at least 3 seconds. Start-up begins in 3 seconds after removal of the short. Within 2
minutes the system should provide dial tone and battery voltage on the subscriber pairs.
3Listen for a dial tone using the customer phone line.
4If dial tone is not heard, then refer to the appropriate COLU Technical Practice for COLU Fault Indicators.
FAULT ISOLATION
The following sections detail the fault isolation procedures. For sections that indicate a condition such as distance
limitation exceeded, refer to “Specifications”on page 2 for the correct values.
COLU FAULT INDICATORS
At the CO, you can use the VT-100 terminal to initiate a subscriber drop test to determine the cause of any of the
following problems. Table 1 provides procedures for isolating faults indicated by the COLU LEDs.
Table 1. COLU LED Fault Isolating
LED Mode Condition Procedure
None On processor in the COLU stopped 1Remove and re-insert the COLU.
2At the VT-100 interface, go to the COLU Main screen to view the
Performance report to verify that no alarms exist. If the COLU Main screen
cannot be viewed, a communication error exists, indicating a faulty COLU.
3If the LEDs do not illuminate, replace the COLU.
Fault On indicates an existing alarm
condition on the COLU
1At the VT-100 interface, go to the COLU Main screen to view the
Performance report to determine the cause of the alarm. Correct the
condition, if possible. If the COLU Main screen cannot be viewed, a
communication error exists.
2Remove and re-insert the COLU.
3If the communication error still exists, replace the COLU.
Margin On •distance limitation exceeded 1At the VT-100 interface, go to the COLU Main screen to view the
Performance report to verify that no alarms exist.
•fault in HDSL line 2Initial installation, check engineering records for distance between COT
shelf and RT.
•faulty COLU 3If existing installation, measure loss of HDSL line to ensure that the
maximum attenuation value has not been exceeded.
4Replace the COLU or the RT.

950-779-115-02, Revision 02 Fault Isolation
PRL-770 and PRL-779 List 1E and 2E March 17, 2000 13
SUBSCRIBER REPORTED FAULTS
Use the craft interface to initiate a subscriber drop test to determine the cause of any of the following problems.
The subscriber drop test performs Hazardous Potential, Foreign Voltage, Resistive Faults, Receiver Off-Hook,
and Ringers Tests. Table 2 provides procedures for isolating faults, based on subscriber reports.
Margin Flashing •distance limitation exceeded 1Initial installation, check engineering records for distance between COT
shelf and RT.
•fault in HDSL line 2If existing installation, measure loss of HDSL line to ensure that the
maximum attenuation value has not been exceeded.
•faulty RT 3Replace the COLU or the RT or both.
SYNC Off •HDSL line has lost
synchronization
1Initial installation, check engineering records for distance between COT
shelf and RT.
•distance limitation may have
been exceeded
2If existing installation, measure loss of HDSL line to ensure that the
maximum attenuation value has not been exceeded.
•COLU is faulty 3Replace the COLU or the RT or both.
PWR Off •no input power 1Ground fault condition exists.
•on-board fuse is blown on
COLU
2Check input COT power at COT shelf backplane with COLU removed.
3If power is present at COT shelf backplane, replace the COLU.
PWR Flashing •HDSL line open 1Check line continuity and resistance.
•an overload exists 2COLU power supply or RT may be faulty.
Table 2. Subscriber Fault Isolating
Conditions Causes Procedures
no dial tone,
cannot dial
•Short-circuit or
open-circuit
1At the CO using the craft interface, select Test menu option, and view the test
results. The tests run are for Hazardous Potential, Foreign Voltage, Resistive
Fault, and CPE Termination.
•faulty COLU or RT 2Check for shorts or opens towards the subscriber or on the customer
premise.
3Lift the jumper in the CO between the CO switch and the COT shelf. If dial tone
is present at the switch, replace the COLU.
4If after replacing the COLU the dial tone is still not present, the fault is in the
RT. Replace the RT.
Phone does
not ring
•high-resistance short on
subscriber drop (REN load
exceeded, see
Specifications)
1At the CO, using the craft interface, go to the COLU Main screen to verify the
correct operation of the COLU. If you cannot view the COLU Main screen, a
communication error exists indicating a faulty COLU. Remove and re-insert
the COLU.
•faulty RT or COLU 2Go to the Test menu option, and select the desired circuit to test.
3View the subscriber drop test results. Refer to the Test Submenu section for
specific results.
4Check for ringing on another line terminated on the same RT. If ringing is
present on other lines, check for high-resistance shorts on the subscriber
drop. If no high resistance shorts, replace the RT.
5If ringing is not present on another circuit terminated on the RT, lift the jumper
between the CO switch and the COT shelf. If ringing is present, replace the
COLU. If ringing is not present, the fault is in the switch.
Table 1. COLU LED Fault Isolating (Cont.)
LED Mode Condition Procedure

Fault Isolation 950-779-115-02, Revision 02
14 March 17, 2000 PRL-770 and PRL-779 List 1E and 2E
Phone does
not stop
ringing
•faulty subscriber station
instrument
1If phone stops ringing when using a butt set at the subscriber location, the
subscriber's station internal resistance is too high. Replace phone.
•loop length too long 2If phone does not stop ringing when using a butt set at the subscriber location,
one or both of these conditions exist:
•faulty RT •loop length is too long (refer to Specifications)
•or the RT is faulty
Cannot hear,
cannot be
heard
•faulty COLU or RT Lift the jumper in the CO between the CO switch and the COT shelf.
•If audible level is acceptable, replace the COLU or RT
•otherwise, the problem is in the CO switch
Table 2. Subscriber Fault Isolating (Cont.)
Conditions Causes Procedures