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Appendix C: Meridian Modular Telephones add-on modules installation Page 383 of 504
Telephones and Consoles Description, Installation, and Operation
• Public Switched Data Service (PSDS) compatibility. MCA extends
PSDS and 64K restricted and 64K clear capabilities to Modular
telephones.
• V.25 bit dialing protocol support at all synchronous speeds up to 64 kbps.
High-Level Data Link Control (HDLC) and Bisynch (character oriented)
framing of the V.25 commands are supported.
• Programmable echo canceller disabling for 56 and 64 kbps network calls
Synchronous and asynchronous mode features supported by the MCA
include the following:
• T-Link and DM-DM support
• T-Link and DM-DM are Nortel proprietary protocols. The SL-100 and
DMS data devices use T-Link. DM-DM is used by CS 1000 and
Meridian 1 data devices such as ASIM, AIM, ADM, SADM,
Asynchronous Data Option (ADO), and MPDA. MCA can use both
DM-DM and T-Link.
• Hotline
• Virtual Leased Line
• V.35 interface capability selectable with jumper plugs on the MCA
• Data tandem calls across TIE trunks, provided all switches involved are
Nortel machines
• PSDS tandem data calls across TIE trunks are supported with release 18
or later when each tandem node uses an ISDN Primary Rate Interface
(PRI) or Basic Rate Interface (BRI) connection. See Transparent Data
Networking (553-2731-110) for more information.
Note: Internal PSDS calls are not supported.
MCA operating parameters
The MCA data parameters are stored locally, although the configuration is set
in the system. Data parameters cannot be set in the system before installing
the MCA in the telephone. If the parameters are set before the telephone is
installed, the configuration information is lost.