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Modem 34336
• If you want to disconnect from the diagnostic link without establishing
a new link, issue the CONNECT command without an address.
4.10 Automatic Fallback
The Modem incorporates two automatic fallback features that are controlled
by the user:
• Operating Mode Fallback—Provides compatibility with modems that use
any of several different operating modes.
• V.32 Speed Fallback— Allows the Modem to automatically select the
highest possible data rate, depending on the signal quality during
handshake.
Both of the above fallback features function when the modem is in either
manual or automatic originate mode, or manual or automatic answer
mode.
4.10.1 O
PERATING
M
ODE
F
ALLBACK
This section applies to dial-line operation only.
When the Modem originates or answers a call, it determines from the
handshake routine with the other modem the most efficient operating mode
that is supported by the other modem and automatically falls back to that
mode. The Modem supports two alternatives for operating mode fallback:
V.22 bis/Bell 212A/Bell 103 fallback operation (default setting) and V.22
bis/V.22/ V.21/V.23 fallback operation. For communication within the
United States, use the default setting for Operating Mode Fallback: V.22
bis/Bell 212A/Bell 103.
To configure the modem for V.22 bis/V.22/V.21/V.23 fallback operation,
refer to Appendix C. Follow the instructions given there to change the value
identified in the MISCELLANEOUS OPTIONS diagram (Appendix C) as
the Operating Mode Fallback parameter from 0 (default setting) to 1.