Meridian Communications Unit; Functional Description - Nortel M3110 Installation Manual

Page 430 of 504
Table 71
RS-232-C signals and associated pin numbers for M2317 telephones
Circuit designation
EIA Common
AA
BA TXD
BB RXD
CA RTS
CB CTS
CC DSR
AB GND
CD DTR
CE RI

Meridian Communications Unit

Functional description

553-3001-367 Standard 3.00
Appendix C: Meridian Modular Telephones add-on modules installation
CCITT
101
103
104
105
106
107
102
108.2
125
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
August 2005
Pin
number
DTE
1
2 X
3
4 X
5
6
7 X
20 X
22
Signal source
DCE Name
X Frame ground
Transmit data
X Receive data
Request to send
X Clear to send
X Data set ready
Signal ground
Data terminal ready
X Ring indicator