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The AB bits transmitted by the MultiAccess will "wink" back to the Central Office upon detection of an inbound
call. The sequence of events is as follows:
•
No call = both sides (Telco equipment and MultiAccess) indicate idle (transmit 00).
•
Telco indicates off hook (transmits 11 to MultiAccess).
•
MultiAccess receives 11 (off hook) from Telco, causing the MultiAccess modem to indicate Ring detected.
•
MultiAccess waits the duration of the "Pre Wink Time", then transmits 11 for the duration of "Wink High
Time" (winks), then returns to indicating idle (transmits 00) for the duration of the "After Wink Time".
•
When the After Wink Time expires, the MultiAccess continues to indicate on hook (transmit 00) until the
MultiAccess modem is instructed to answer.
•
When instructed to answer the MultiAccess indicates off hook (transmits 11) until the completion of the
modem call.
When the MultiAccess originates a call, it waits to see a wink from the Central Office before it transmits the
DTMF digits. The sequence of events is as follows:
•
No call = both sides (Telco equipment and MultiAccess) indicate idle (transmit 00).
•
MultiAccess modem is instructed to dail.
•
MultiAccess indicates off hook (transmits 11 to Telco).
•
Telco winks back (in the same fashion as the MultiAccess did in the previous example).
•
After the MultiAccess detects the wink, it transmits the DTMF digits (in the voice\B_Channel).
•
The MultiAccess modem then listens into the channel (for a busy signal from Telco) and at the same time
watches the state of the incoming AB bits.
•
If a busy signal is not heard and the destination picks up, Telco indicates off hook (the incoming bits
change to 11), the modem proceeds with the call and listens for answer tones from the answering side
modem. Telco indicates off hook until the answering side hangs up.
•
If a busy signal is not heard and the incoming bits never indicate off hook, the modem will declare No
Answer after it's S7 timer expeires.
•
When the call is terminated or completed, the MultiAccess will transmit on hook (00) until the start of the
next call.
Voice Channel Encoding
This parameter automatically follows the Line Type selection, however the user can change it from it's defaults.
When the line type is set to E1 the PCM rule (Voice Channel Encoding) will be set to A-law. When the line type
is set to T1 this option will be set to u-law. The ability to change this setting independent of the line type allows
for flexibility in privately controlled closed circuit networks.
MultiAccess Communications Server MA30120 User Guide
Chapter 3 – Software
Line Interfaces > Line x
Setup>
T1RBS
122
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