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Modem 34336
• V.32. The Modem normally uses the V.32 handshake. (The Modem also
uses this handshake for V.32/14,400 bps operation.)
• V.33. V.33 operation is available on the Modem for 4-wire leased line
synchronous operation only. The available data rates are 14,400 and
12,000 bps. Either of these rates may be set as the maximum or minimum
by using the Speed Limit MAXIMUM RATE and MINIMUM RATE
screens. Both connected modems must be set for V.33 leased-line
operation.
• V.34. V.34 extended (33.6 kps) mode of operation is in compliance
with proposed TR-30.1 implementation of two new data rates (31.2kps
and 33.6kps) which are compatible with V.34 recommendation.
Interoperability with modems is ensured, provided they comply
with the TR30.1 proposal.
• 208. This selection (on the Modem only) provides both Bell 208A
compatibility for 2-wire or 4-wire leased line operation and Bell 208B
compatibility for 2-wire dial operation. Operation is full duplex in 4-wire
leased line mode only. In Bell 208B mode, synchronous V.25 bis
autodialing is available, but Hayes operation is not. In Dumb mode, calls
may be originated from the front panel. The data rate is fixed at 4800 bps
for 208A/B operation, and the data format is synchronous only. Both
connected modems must be set for 208A/B operation. For 2-wire
applications, the carrier option must be set for switched carrier operation
(SWITCH) via the CARRIER screen, and CTS must be set to follow RTS
(CTS to EIA option).
Three options intended only for 208A/B and V.33 operation are accessible
through MODEM SETUPS screen 7. These options allow you to select
constant or switched carrier, set CTS to follow RTS or set CTS to be always on,
or specify an RTS-CTS delay time. For further information, see the CARRIER,
CTS, and RTS-CTS DELAY headings later in this chapter.