Nortel QMT7 ADM Manual page 30

Page 30 of 80 Equipment description
Table 2
ADM user option selectors (Part 3 of 3)
Selector
Echo—No echo
Manual—Auto Ans
Off—Loopback
Note 1: Selection switch (S4) is located beneath the faceplate and should be set by maintenance
personnel only. The QMT7 (S4) selection switches are used to set up for 5- or 6-bit code, for 1.5 stop bits,
and to force DTR and MI/MIC modem control on or off. The QMT8/QMT11/QMT12 (S4) selection switches
are used to set up for Synchronous or Asynchronous modes, force DTR on or off, set MI/MIC modem
control on or off, and to encode for normal (7 or 8 bit), 5-bit, 6-bit, and hotline (with 7- or 8-bit only)
operation. The 1.5 bit option is provided (in the asynchronous mode only) when the speed setting switch is
set at 134.5 bps.
Note 2: Use of the LOOPBACK setting is recommended only for maintenance personnel. Instructions for
use of the LOOPBACK setting are given in Meridian Data Features: Operations and Tests (553-2731-300).
Note 3: The control label under the flip lid has all speeds shown. Speeds above 19.2 kps are in a different
color for informational purposes. At speeds above 20 kbps, the EIA cable lengths (DTE or DCE to ADM) are
speed-dependent and must be shorter than 50 ft (15 m); e.g., in the 5 to 8 ft (1.5 to 2.5þm) range at 56 kbps.
Note 4: The serial number and Q-code label on the bottom of the ADM contains the interface information
and provides a reference to the connector type.
553-2731-100 Standard 5.00
Description
This is a synchronous QMT8/QMT12 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).
April 2000