0049-1800-xxx 326X V.34, V.34-SDC and V.32bis Series Modem – USER’S GUIDE 02/23/2010
Rev. A
Page 50
of
205
Option Set 3—Sync Dial Only
Option Set 3 satisfies the needs of a synchronous dial application (see Table 4-2). With Option Set 3, the
modem provides the network timing (
Clock
=Internal). Select a data rate at which the modem
communicates with the DTE, using
DTE Rate
(AT
*
DE). Consult the description in Appendix A.
With this option set, the local and remote modems are configured for SDC operation. The modems
default to
Fast Call
=Lvl3, and use LAPM error correction with a modified V.42bis data compression.
Enable Option Set 3 in both the local and remote modems, and ensure that
Mode
(AT*SM) is set
the
same
in both modems.
With Option Set 3,
DTR
=108.1 so that an off-to-on DTR transition instructs the modem to connect to the
telephone line. If the modem detects an incoming call, the call is connected. If the modem does not
detect an incoming call and
Default Dial
(AT*DA) is enabled, the modem dials the number specified. If
Default Dial
is disabled, the modem refers to the
Modulation Mode
option (AT*MM). If set to Answer,
the modem goes off-hook and sends an answer-back tone. An on-to-off DTR transition disconnects the
modem from the telephone line. If DTR is low, the modem does not auto-answer. DTR transitions govern
how the modem answers and disconnects calls. All options in the ACU OPT’S category are set for a
typical synchronous DTE.
The modem uses the adaptive rate feature in the V.34 Auto modulation mode. This ensures maximum
throughput when line quality is poor.
Option Set 4—Sync Leased Line with Dial Restoral; No ACU (Models 3261/63/66/68)
Option Set 4 uses the modem’s leased line restoral feature. With this option set, the modem operates
primarily on a leased line unless that line fails. If so, the modem automatically restores the connection
over a single dial line. You must install a 326X
FAST
-SDC Modem at both ends of the leased line to
implement restoral.
Option Set 4 configures the modem for a general restoral application (see Table 4-2). The modem uses
the adaptive rate feature in the V.34 Auto modulation mode. This setting ensures maximum throughput
when line quality deteriorates. If restoral criteria are met, the modem automatically reroutes data traffic
through the public switched telephone network (PSTN) over a single dial line. At that time, the modem
attempts to run at 28.8 kbps over the dial line, and falls back to lower speeds if required. After an hour,
the modem returns to the leased line.
With Option Set 4, the modem provides the network timing (
Clock
=Internal). Select a data rate at which
the modem communicates with the DTE, using
DTE Rate
(AT*DE). Refer to the description in
Appendix A.
In this option set, the local and remote modems are configured for SDC operation. The modems default to
Fast Call
=Lvl3, and use LAPM error correction with modified V.42bis data compression. Enable Option
Содержание 326X V.32bis Series
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