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COMSPHERE 3800Plus Modems
8-28 November 1996 3980-A2-GB30-20
Table 8-5
(2 of 4)
Leased Line Configuration Options
*LeasedLine Rate: 28800(V34)
Nxt 28800(V34) 33600 31200 26400(V34) 24000(V34) 21600(V34) 19200(V34) 16800(V34) 14400(V34)
12000(V34) 9600(V34) 7200(V34) 4800(V34) 2400(V34)
- OR -
Nxt 19200(V32t) 16800(V32t) 14400(V32b) 12000(V32b) 9600(V32b) 7200(V32b) 4800(V32b)
- OR -
Nxt 2400(V22bis)
- OR -
Nxt 14400(V.33) 12000(V.33) 9600(V.29) 7200(V.29) 4800(V.29)
Leased-Line Rate. Determines the modem’s data rate and modulation scheme for operation on leased lines. In Async
mode, the DTE rate must equal the leased-line rate. Leased Line Rate sets the upper limit rate and modulation; lower
speed connections may still be possible.
What Leased Line Rate configuration options are displayed depends the setting of Modulation.
28800(V34), 33600, 31200, 26400(V34), 24000(V34), 21600(V34), 19200(V34), 16800(V34), 14400(V34), 12000(V34),
9600(V34), 7200(V34), 4800(V34), 2400(V34) – These modulation schemes are available on 2-wire or 4-wire leased
lines. The modem operates using V.34 modulation at the data rate selected. The modem can be forced by the remote
modem to a lower data rate. The 33,600 and 31,200 bps rates are Paradyne extensions of the CCITT V.34
recommendation.
19200(V.32t), 16800(V32t), 14400(V.32bis), 12000(V.32bis), 9600 (V.32bis), 7200(V.32bis), 4800(V.32bis) – These
modulation schemes are available on 2-wire or 4-wire leased lines. If a fixed V.32bis rate is selected, the modem can still
be commanded to fall back by a remote modem.
2400(V.22bis) – This modulation scheme is available on 2-wire and 4-wire leased lines.
14400(V.33), 12000(V.33) – These modulation schemes are available only on 4-wire leased lines, and only with modems
that have the optional V.33 Leased-Line feature installed.
9600(V.29), 7200(V.29), 4800(V.29) – These modulation schemes are available only on 4-wire leased lines, and only
with modems that have the optional V.29 Leased-Line feature installed.
NOTE: It is recommended that both modems use the same fixed data rate.
The factory default is 28800(V34).
AT command equivalent is S-register S44=
n.
*Autorate: Enable
Nxt Enable Disable
Autorate. The modems adapt to VF line condition and connect at the optimum rate during initial line establishment. Once
connected, the modem automatically lowers the line rate if line conditions become impaired. When line conditions
improve, the modem automatically shifts up to the highest data rate the line can support. This autorating only occurs
between 4800 bps and 19,200 bps during V.32bis and V.32
terbo
connections and between 2400 bps and 33,600 bps
during V.34 connections.
The factory default is Enable.
AT command equivalent is S-register S82=
n
.
* This configuration option is only available if the Sync Leased factory preset template is selected.