CopperOptics 150-1354-01, Руководство пользователя

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Section 363-754-100-02 January 12, 1998 Revision 02
Page 6 PairGain Engineering - Plant Series PG-Flex FRC-754 List 1
5. Operational Capabilities
5.1 The FRC-754 RT Channel Unit provides 8 POTS interfaces between the RT and subscribers, and
performs the following functions:
•
64 kbps A-Law PCM encoding
•
applies ringing voltage
•
generates forward disconnect
•
generates metering tones
•
detects an off-hook or ring-trip condition
•
connects a subscriber loop to a metallic test pair
•
protects against secondary surges
5.2 A block diagram of the FRC-754 Channel Unit is shown in Figure 3. One 8-Channel RT Channel
Unit supports eight POTS interfaces.
5.3
A status LED is associated with each line to indicate whether the line is 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.
5.4
Test access connections to a specific line circuit are made through the maintenance terminal or by
the CO switch applying the appropriate voltages on the subscriber line (see paragraph 4.6).
Figure 3. FRC-754 Block Diagram