CopperOptics 150-1354-01, Руководство пользователя

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Section 363-754-100-02 January 12, 1998 Revision 02
Page 4 PairGain Engineering - Plant Series PG-Flex FRC-754 List 1
B. FUNCTIONAL DESCRIPTION
4. Applications
4.1
PG-Flex is a small capacity universal subscriber carrier system that can support up to 32 subscriber
channels, including POTS and ISDN services. The system, based on HDSL transmission technology,
is remotely powered from the Central Office. Using two 24 gauge (0.5 mm) unconditioned copper
pairs, the remote terminal may be located up to 10.7 kft (3.3 km) from the Central Office terminal.
Standard 19- or 23-inch shelves contain multiple systems; circuit cards may be hot-swapped without
affecting other systems installed in the shelf. POTS channel units use 64-kbps A-Law pulse coded
modulation (PCM) encoding to allow Group 3 facsimile or high-speed modem operation on all
channels.
4.2 System Flex Configuration. Figure 2 shows a typical PG-Flex system that consists of:
•
COT. Two complete systems may be installed in a 19-inch COT Shelf and four complete
systems may be installed in a 23-inch COT Shelf. Each system requires one COT Line Unit and
up to three (23-inch shelf) or six (19-inch shelf) Channel Units. A common Alarm Unit or Pair
Gain Test Controller Interface Unit in each shelf provides an interface for maintenance alarm
relays and metallic access to the remote subscriber lines.
•
RT. The Remote Terminal communicates with, and is line-powered from, the COT over two
pairs of 19- to 26-gauge (0.9 mm to 0.4 mm) twisted-pair telephone wire. Each pair carries both
power and HDSL signaling. The RT Enclosure provides a weatherproof housing for the PG-Flex
remote electronics and subscriber terminations. The enclosure accepts one common RT Line
Unit and up to four Channel Units.
Figure 2. Typical PG-Flex Configuration