PairGain PG-Flex 8 FLC-704, Руководство пользователя

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Section 363-704-102-02 January 12, 1998 Revision 02
Page 6 PairGain Engineering - Plant Series PG-Flex FLC-704 List 2
5. Operational Capabilities
5.1 The FLC-704 Channel Unit provides eight POTS interfaces to the CO switch. The unit performs the
interface function between the analog POTS circuit and the internal digital PCM bus. In addition,
each channel unit:
•
converts analog signals to 64 kbps A-Law PCM digital format
•
detects ringing voltage
•
detects loop current feed
•
detects forward disconnect
•
detects a subscriber test access signal
•
detects metering tones
•
provides loop closure
5.2 A block diagram of the FLC-704 Channel Unit is shown in Figure 3. One 8-Channel COT 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 (paragraphs 4.6 through 4.9).
Figure 3. FLC-704 Block Diagram