Section 363-712-131-01
February 24, 1998
Revision 01
Page 6
PairGain Engineering - Plant Series
PG-Flex FLL-712 List 3A
Table 2 shows the maximum distance between the COT and the RT for various gauge wire. Because
of HDSL transmission technology, the HDSL lines require no special conditioning and may include
unterminated bridge taps, but cannot include load coils.
Table 2. PG-Flex Distances
Loop Length
Wire Gauge
12/24 Channel System
DC Resistance
26 AWG
(0.4 mm)
9.0 kft
(2.8 km)
750
Ω
24 AWG
(0.5 mm)
12.3 kft
(3.8 km)
638
Ω
22 AWG
(0.6 mm)
16.1 kft
(5.0 km)
521
Ω
19 AWG
(0.9 mm)
22.8 kft
(7.0 km)
367
Ω
Do not share metallic bypass pairs between PG-Flex systems and between
PG-Flex and other Digital Loop Carrier (DLC) systems.
4.3
Subscriber Drop Testing.
For subscriber drop testing from the Central Office, PG-Flex is able to
select and connect any subscriber drop to a metallic bypass pair at the RT. PG-Flex extends this
connection back to the COT where it is switched to the test jack on the FAU-728 or FPI-729 units or
to the corresponding subscriber line on the COT channel card.
Metallic access is performed by momentarily p116 Vdc (from the CO) on the subscriber’s
Tip lead. (The Ring lead should be between GND and the Tip value.) With POTS, Ground
Start/Loop Start, and ISDN channel cards, the selected subscriber drop (assuming a working metallic
bypass pair) connects to the corresponding COT subscriber line.
The metallic connection drops when -116 Vdc is momentarily applied to the subscriber’s COT Tip
lead.
Metallic access may also be activated through an ASCII terminal connected to the RS-232
Maintenance port located on the front of the FLL-712 line unit or through the FAU-728 List 2 or
FPI-729 units.
5. Operational Capabilities
5.1
The FLL-712 COT line unit provides the following functions for each 24-channel system in a single
COT shelf:
•
system power supply
•
HDSL line transceivers and simplex RT power
•
front-panel status indicators
•
RS-232 Maintenance Interface (DCE)
•
switched access to the metallic bypass pair
•
MLT/PGTC loop test system compatibility
•
4Tel loop test system compatibility
Summary of Contents for PG-Flex FLL-712
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