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Page 430 of 504 Appendix C: Meridian Modular Telephones add-on modules installation
553-3001-367 Standard 3.00 August 2005
Meridian Communications Unit
The Meridian Communications Unit (MCU) provides a stand-alone version
of the Meridian Communications Adapter (MCA).
Functional description
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
Table 71
RS-232-C signals and associated pin numbers for M2317 telephones
Circuit designation
Pin
number
Signal source
EIA Common CCITT DTE DCE Name
AA 101 1 X Frame ground
BA TXD 103 2 X Transmit data
BB RXD 104 3 X Receive data
CA RTS 105 4 X Request to send
CB CTS 106 5 X Clear to send
CC DSR 107 6 X Data set ready
AB GND 102 7 X Signal ground
CD DTR 108.2 20 X Data terminal ready
CE RI 125 22 X Ring indicator