Nortel Circuit Card Installation Manual page 468

Page 468 of 906
Table 158
Connect and disconnect protocol (Part 8 of 12)
Mode of
operation Interface application
Mode 9 Hotline call origination
553-3001-211 Standard 3.00
NT7D16 Data Access card
August 2005
Comments
Call disconnect ion (DAC):
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.
Call disconnection (Host):
The Host toggles DTR from ON to OFF (DTR
must be OFF for 100 ms or more). The DAC drops
DSR, DCD, and CTS and disconnects the local
call.
Hotline originated by Host (Inbound):
Host toggles DTR from OFF to ON to initiate the
Hotline call.
DAC responds by trying to establish a Hotline call
to a specific Data Module (Autodial).
3When Data Module answers, then and only then,
the DAC turns DSR, DCD, and CTS ON (the DAC
does not send any prompts to the Host). If the
Data Module is busy or not responding, the DAC
requires another transition of DTR from OFF to
ON to initiate another Hotline call. If the Host
keeps DTR ON, the DAC does not try to establish
another Hotline call, unless the Host sends a
<CR> while DTR is ON.
Call disconnection:
Disconnection is identical to mode 8.