Nortel QMT7 ADM Manual page 29

Table 2
ADM user option selectors (Part 2 of 3)
Selector
2W—4W
ECHO—NO ECHO
MANUAL—AUTO ANS
OFF—LOOPBACK
Synchronous ADM Operation (QMT8 and higher)
S3.1 and S3.2
HDX—FDX
Modem—Network
Extþclock—Intþclock
Description
The 2W position provides for local echo while the 4W
position does not provide for echo. The QMT8 labels this
switch as Echo—No Echo.
This is a QMT8 switch assignment: The Echo position
provides for local echo, while the No Echo position does not
provide for echo from the ADM.
This establishes how calls to the ADM are answered:
manually or automatically.
This switch is used by maintenance personnel to test ADM
using the loopback setting. The switch is OFF during regular
transmissions (Note 2).
(Not used by synchronous QMT8 or QMT12)
Provides for the transmission aspects: HDX when
half-duplex direction of transmission is under dynamic
control of EIA leads CTS, RTS, and CD (this switch provides
local carrier monitoring of local request-to-send to ensure
compatibility with 2-wire modem); FDX when full-duplex
communications is required.
This is a synchronous QMT8/QMT12 switch assignment:
Modem is used (clocks are not synchronized) for all
connections except for connections to a digital network;
Network is used when the transmit and receive clocks are
jointly synchronized.
This is a synchronous QMT8/QMT12 switch assignment: Ext
clock is used when a device connected to the ADM controls
the transmission clock; Int clock is used when the Meridian 1
controls the transmission clock.
Equipment description
Meridian Data Services
Page 29 of 80
Description