ADC PG-Plus PRL-784, Technical Practice, Page: 9 / 30

SCP-PRL784-022-03H Product Overview
PG-Plus PRL-784 January 6, 2003 1
P
RODUCT
O
VERVIEW
This practice describes the ADC
®
PG-Plus
®
PRL-784, List 2B, a Remote Terminal that provides interfaces to two
2 POTS RTs for four POTS subscribers.
D
ESCRIPTION AND
F
EATURES
A PG-Plus application (see Figure 1 ) 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 POTS interfaces on a single HDSL twisted-pair
wire. A typical configuration of PG-Plus application consists of:
•
COTS
•
COLU
•
Two RTs
Figure 1. Typical PG-Plus Application
The COLU uses ADC's HDSL technology to provide digital transmission without the need for repeaters, loop
conditioning, or pair selection.
The COLU can be installed in the PCS-718 or the PCS-719 COTS. The COLU operates in the standalone mode
with no other COTS circuit cards required. Advanced features such as performance monitoring, alarm reporting,
and testing require the addition of the PAU or the PMU. Line power is provided to the RT by the COLU.
Metallic fallback provides a direct connection from the CO to one subscriber under fault conditions. Service is
provided to the first POTS subscriber on the affected system. At the RT, the system exits metallic fallback and
attempts to synchronize if either the first POTS or the HDSL Tip to Ring pair is shorted for at least three seconds,
and then released for at least three seconds. Otherwise, the COLU checks for the presence of an RT every five
minutes. If an RT is present, the system begins HDSL synchronization acquisition.
Relays in the COLU and RT provide a path for SDT and metallic fallback operation. These relays are used to
establish a circuit to POTS # 1 during fault conditions and to provide for drop testing of the selected subscriber
line from the CO location.
POTS-1A
POTS-2A
POTS-1B
POTS-2B
COLU
COTS
HDSL Pair A
HDSL Pair B
RT-A
RT-B
POTS-1A
POTS-2A
POTS-1B
POTS-2B