Meridian Communications Unit - Nortel Meridian 1 Succession 1000 Description

Page 202 of 532
Figure 56
Block diagram of MCA and Modular telephone
EIA
RS-232-C Drivers
DTE I/F Receivers

Meridian Communications Unit

Functional description
553-3001-367 Standard 1.00
Communications adapter
MDAD
µ
P
A64
+12V
+5V
Power Supply
-12V
The Meridian Communications Unit (MCU) provides a stand-alone version
of the Meridian Communications Adapter (MCA).
The Meridian Communications Unit (MCU) enables data to be transmitted
and received using PSDS, over either the public network or a private network.
The MCU, which replaced the QMT21C, is designed for domestic and
international use, with transmission speeds up to 19.2 kbps asynch and
64 kbps synch, integrated display, and self diagnostics.
The MCU supports autodialing, ring again, and speed calling, as well as
autobauding and automatic parity detection. The MCU can be used for the
following:
• Video conferencing
October 2003
Telephone
MTDC
A44
+5V
µ
P
Power supply
option card
Meridian 1
I
S D
D or L
L C
C
553-AAA0740