Station equipment 63
If QCW4E or later vintage is used, either a.QMT4C must be used or the
QMT4A or QMT4B must be used as standalone cradles.

QMTI 1 asynchronous/ synchronous interface module

The Asynchronous/Synchronous Interface Module (AS&I) is similar to the
QMT9 but provides added dialing capabilities and six data feature keys and
associated lamps and data control switches. Refer
to SL-1 Data Feature
-
General description andprovisioning
(553-2731-100) for more information.

QMT12 add-on data module

The synchronous
ADM
provides a
CCIlT
V.35 interface between the
Meridian 1 system and customer-supplied dam equipment. Refer to SL-I
Data Feature-General description and provisionin
(553-2731-100)
for
more information.
Each ADM requires a local supplementary power supply such as the
PO593922 or PO610756 transformer.
I.

QMTI 5 amplified handset module

This module is similar to the QMT4 module, with addition of an amplifier
for the hearing impaired. It includes a volume control, 2 headset plugs on
the right side of the module which plug into the headset jacks on the
__
console. It also has 2 headset/handset plugs on the left side. One (attendant
jack) is under control of the amplifier; the second (supervisor jack) cannot
have its volume adjusted.

QMT21 high-speed

data

module

This module is similar to the
QMTll
module. It provides RS-232/V.35
interface and allows synchronous data transmission of up to 64 kbps. It
provides connectivity to the Data Terminal Equipment (DTE) for intra-
switch communications, as well as wide area communications over DTI/PRI
links to other Northern Telecom switches. Refer
to
QMZZ High-Speed
Data Module -Description, installation, and operation
(553-2731-107)
for more information.

QUSI logic handsfree unit

This unit provides handsfree voice switching facilities on the SL-1
telephone. Refer to 512-6251-200 for a complete description.
Equipment identification and ordering information 553-3001-154