Nortel Circuit Card Installation Manual page 469

Table 158
Connect and disconnect protocol (Part 9 of 12)
Mode of
operation Interface application
Mode 10 Host access for call
origination and answering
(with forced DTR)
Mode 11 Hotline call origination
(Virtual Leased Line)
NT7D16 Data Access card
Comments
Host access for call origination and
answering:
The DAC operation is identical to mode 8 except
DTR is always considered ON, even when the
Host is driving DTR OFF.
Call disconnection:
DAC drops DSR, DCD, and CTS if the local DM
user releases the call. The Host should then drop
the call.
DAC drops DSR, DCD, and CTS if the Host sends
a long break or three short breaks. The Host
should then drop the call.
Hotline origination by Host (continuous
Hotline mode):
The DAC operation is similar to mode 9 except the
Host initiates the Hotline call by driving DTR ON.
However, if the DM is busy or not answering, the
DAC will continuously try to originate Hotline calls
once every 40 seconds (as long as DTR stays
ON) until the called DM answers the call.
Call disconnection:
Disconnection is identical to mode 8.
Circuit Card
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Description and Installation