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You can connect a modem to one of the following:
1
An SDI port to remotely monitor general system operation
2
The COM ports for debugging and patch downloading (through your
Avaya representative)
3
A remote connection to both the SDI and COM2 ports
Modem guidelines
At the Large System end (the local end), modems must be set to dumb mode
(command recognition OFF, command echo OFF). The local end modems
can be configured with:
1
one modem connected to the SDI port and the cable switched to each
COM2 port as needed (see Figure 73 on
2
one modem connected to a switch box that is connected to the SDI and
COM2 ports (see Figure 74 on
Note: The second method listed here is preferred. Other configurations,
such as a separate modem for each port, are possible.
At the remote end, at least one modem (which can be set to smart mode), one
terminal, and one RS-232 cable are required in all modem configurations.
Required and recommended specifications for local end modems are:
1
Required: true, not buffered, 9600 baud support (required for remote
Avaya technical support)
2
Required: CCITT V.32 or V.32bis compliance
3
Recommended: the ability to adjust to lower and higher speeds,
depending on line quality, while maintaining 9600 baud at local DTE
4
Recommended: V.42 error correction
5
Recommended: V.42bis data compression
A dispatch or call back modem, normally connected to the SDI port, can be
used if it meets the requirements. To use a dispatch or call back modem that
does not meet the requirements, the modem must be used with a modem that
meets specifications.
Connecting a system terminal or modem
Large System Installation and Commissioning
page
187), or
page
189).
Page 183 of 436
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