PairGain PG-Flex 8 FLC-704, Руководство пользователя

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Section 363-704-102-02 January 12, 1998 Revision 02
Page 4 PairGain Engineering - Plant Series PG-Flex FLC-704 List 2
B. FUNCTIONAL DESCRIPTION
4. Applications
4.1
PG-Flex is a small capacity universal subscriber carrier system that can support up to 32 DS0
subscriber channels, including POTS and ISDN services. The system is based on HDSL transmission
technology and is remotely powered from the Central Office (CO). Using two 24 gauge (0.5mm)
unconditioned copper pairs, the remote terminal may be located up to 10.7 kft (3.3 km) from the
Central Office Terminal (COT). 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 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. The RT communicates with, and is line-powered from, the COT over two pairs of
19 AWG to 26 AWG (0.9 mm to 0.4 mm) twisted-pair telephone wire. Each pair carries both
power and HDSL signaling.
Figure 2. Typical PG-Flex Configuration.