Section 363-753-102
Revision 01
Page 6
B. FUNCTIONAL DESCRIPTION
6. OPERATIONAL CAPABILITIES
6.01
The FRC-753 RT Channel Unit provides 8 POTS
interfaces between the RT and subscribers, and
performs the following functions:
•
64 kbps
µ
-Law PCM encoding
•
Applies ringing voltage
•
Generates forward disconnect
•
Detects an off-hook or ring-trip condition
•
Connects a subscriber loop to a metallic test pair
•
Protects against secondary surges
•
Pair Gain Test Controller (PGTC) compatibility
6.02
A block diagram of the FLC-753 Channel Unit is
shown in Figure 3. One 8-Channel RT POTS unit
supports eight POTS interfaces.
6.03
A status LED is associated with each line to indicate
whether the line if off-hook, idle, ringing, or being
tested. A common fault LED indicates a general fault has
been detected on the card and it should be replaced.
6.04
Test access connections to a specific line circuit are
made through the maintenance terminal or by the
CO switch applying the appropriate voltage on the subscriber
line (see paragraphs 2.01 through 2.04).
7.
FRONT PANEL
7.01
The front panel of the FRC-753 Channel Unit
contains the following indicators (see Figure 1):
•
ACTIVE 1-8 LED Indicators
Green—the channel is off-hook.
Flashing Green—(slow flash) the channel is ringing
(the LED will track the ringing) or the line has been
switched to the test pair.
Off—the channel is on-hook.
•
FAULT LED Indicator
Red—a fault has been detected by the unit.
Off—no faults are detected by the unit.
C. INSTALLATION AND TEST
8. UNPACKING
8.01
Upon receipt of the equipment, proceed as follows:
1. Unpack each container and visually inspect it for
signs of damage. If the equipment has been
damaged in transit, immediately report the extent
of damage to the transportation company and to
PairGain. Order replacement equipment if
necessary.
2. Check the contents versus the packing list to
ensure complete and accurate shipment. If the
shipment is short or irregular, contact PairGain as
described in Section 5. If you must store the
equipment for a prolonged period, store the
equipment in its original container.
9. TURN-UP AND TESTING
9.01
Table 2 provides step-by-step turn-up and test
procedures for the FRC-753 Channel Unit.
10. TROUBLESHOOTING
10.01
Table 3 provides troubleshooting procedures based
on indications displayed by the front panel
indicators of the FRC-753 Channel Unit.
