Section 150-319-124
Revision 03
Page 2
A. PRODUCT OVERVIEW
(Doubler and Non-Doubler)
1. DESCRIPTION AND FEATURES
1.01
PairGain’s HiGain Line Unit Model HLU-319
Issue 1, List 2D (see Figure 1) is the Central Office
side of a repeaterless T1 transmission system. When
used in conjunction with an HRU-412 HiGain Remote
Unit, the system provides 1.544 Mbps transmission on
two unconditioned copper pairs over the full Carrier
Serving Area (CSA) range. The CSA includes loops
which are up to 12,000 feet of AWG 24 or 9,000 feet
of AWG 26 wire, including bridged taps. The HiGain
system uses HDSL (High bit rate Digital Subscriber
Line) transmission technology as recommended by
Bellcore TA-TSY-001210. HiGain complies with TR-
TSY-000063 (Network Equipment Building System
(NEBS) Generic Equipment requirements) and TR-
TSY-000499 (Transport System Generic
Requirements—TSGR) common requirements.
1.02
The HLU-319 is compatible with the following
T1 repeater shelves and associated equipment:
•
Charles Ind. #3192 (28-slot connectorized)
•
Charles Ind. #3192-9F Alarm Card
•
Larus #1185 (28-slot connectorized)
•
Larus #1184 Alarm Card
•
Charles Ind. #3192-WR (28-slot wire wrap)
•
Charles Ind. #343-00
(12- to 14-slot wire wrap)
•
Charles Ind. #319-02 (22-slot
connectorized)
•
Charles Ind. #319-04 (22-slot wire wrap)
•
Charles Ind. #340-00
(9- to 11-slot wire wrap)
•
PairGain HMS-318 (22-slot, 19-inch shelf)
•
PairGain HHS-319 (3-slot, 19-inch
horizontal shelf)
•
PairGain HMS-317 (28-slot, 23-inch shelf)
•
PairGain HMS-308
(8-slot remote enclosure)
1.03
The Charles Ind. #343-00 and #340-00
shelves do not support the HLU-319’s Minor Alarm
output on pin H. Also, if slots 1 and 2 of these
shelves were wired for the 3408 Fault Locate unit,
they must be rewired to accept the HLU-319.
1.04
Revision History of this practice.
Revision 03—November 6, 1996
a) Added reference to the HDU-451 List 4
and HDU-439/437 doublers.
1.05
HLU-319, List 2D features:
•
Selectable DS-1 pre-equalizer
•
130 to 200 Vdc HDSL line power for
doubler and HRU-412
•
Optional bipolar (± 65 or ± 100 Vdc) or
unipolar (-130 or -200 Vdc) HDSL line
power voltage via switch S2
•
Front panel HDSL S/N margin display
•
Compatible with Span Terminating Shelf
(STS) high density shelves
•
Selectable loopback activation codes
•
RS-232 maintenance port
•
Network Management Administration
(NMA) interface
•
Non-volatile front panel operator setup
•
Front panel DS1 splitting and bridge access
•
Lightning and power cross protection on
HDSL interfaces
•
784 kbps full duplex 2B1Q HDSL
transmission on two pairs
•
Front panel status indicating LED
•
On / Off front panel display power cycling
•
DS1 LOS detector (125 consecutive zeros)
•
Margin threshold alarm
•
HDSL AIS and Smart-Jack AIS options
•
Easy return to factory default user settings
•
Circuit ID option
•
Low power consumption
•
30% less power than List 1
2. HIGAIN SYSTEM APPLICATIONS
2.01
The HiGain system provides a cost-effective,
easy-to-deploy method for delivering T1 High Capacity
Digital Service (HCDS) over metallic pairs. The fiber-
like quality service is deployed over two
unconditioned, non-loaded copper pairs.
Conventional in-line T1 repeaters are not required.
Cable pair conditioning, pair separation and bridged
tap removal are not required.
2.02
The general guidelines require that each loop
have less than 35 dB of loss at 196 kHz, with 135
ohms driving and terminating impedances. The
HiGain system operates with any number of other T1,
POTS, Digital Data Service (DDS), or other HiGain
systems sharing the same cable binder group. HiGain
systems can be used with customers requiring DS1
service on a temporary or permanent basis. The
HiGain system also provides a means of quickly
