CXR V.34bis series, Operation And Installation Manual

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Modes and Configurations
40
V.34bis Series Standalone & Rackmount Modems
Busy-Out
Busy-Out is typically used in applications where multiple modems are used
in a pooling environment and all incoming calls must be accounted for. If a
modem goes bad, it may block all other modems "behind" it from receiving
calls if not made busy. By enabling Busy-Out, the rotary group will "skip"
the bad modem and go to the next available modem.
Conditions that will cause a modem "busy-out" to occur include:
1. The modem power-up self-test failed.
2. No +5v power supplied to the modem.
3. The modem rings 5 times without going off hook (this might occur if no
DTR signal is present).
4. The modem answered 5 consecutive incoming calls without
successfully connecting with the remote modem. This might occur if
the DSP is defective or the phone line is connected to the wrong jack.
Note: 1) Jumpers J-12 and J-13 must be put in the ON position
2) When a modem busy-out condition occurs the DTR, DSR, CD,
CTS, SQ, ERR, TST and speed LEDs will flash continuously.
Non-flashing LEDs will indicate the type of failure that has
occurred:
DSR Ring without answer
CD Failed power-up self-test
CTS Failed answer handshake