Controls And Indicators - Nortel QMT7 ADM Manual

Controls and indicators

The module is equipped with a speed switch (synchronous), eight mode
switches, a keypad dial, data status lamps, and feature/feature keys.
The recessed 8-position DIP switch provides for Hotline, Forced DTR,
Manual/Auto Answer, Loopback, Async/Sync, HDX/FDX, Ext/Int Clk, and
Modem/Network (the last four functions are not applicable with
Asynchronous operation). The switches are set by the user to match the data
setting of the DTE. Refer to Table 2 for more details.
Note 1: When the ASIM is in the asynchronous mode, the Terminal
setting enables the dialing menus, progress prompts, and other responses
sent to the DTE. In this mode, DSR, DCD, and CTS are high at all times.
When the call is disconnected, DSR, DCD, and CTS pulse to a space
state for 200 msec and then return to a mark state.
Note 2: When the ASIM is in the asynchronous mode, the Host setting
suppresses all prompts to the DTE. The implementation of this mode in
the C or earlier vintage held DSR, DCD, and CTS high when the call was
not established. The QMT11D vintage keeps DSR, DCD, and CTS low
until the call is connected and then raises them high.
Note 3: When the ASIM is in the Hotline mode with Forced DTR on
(VLL mode), the ASIM waits 1.5 seconds after a call is disconnected and
then begins to use the Hotline mode continuously until the call is
reestablished. It can be stopped by setting either the Hotline or Force
DTR switch to the OFF position.
Note 4: When the ASIM is set in the VLL mode, Int Clk, Modem, and
Sync setting, the Transmit Clock EIA lead (pin 15 of DB-25)
continuously outputs the clock signal, regardless of the state of the call.
Note 5: Only one side of the data connections should have the Hotline
or VLL turned on. Otherwise, both data modules will be trying to call
each other and will never connect.
Equipment description
Meridian Data Services
Page 39 of 80
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