3
Table 2 shows the changes to the User’s Guide for Leased Line Configuration Options when the V.29 or V.33
Option is installed.
Table 2
Leased Line Configuration Options
LeasedLine Rate: 14400(V32b)
Nxt 19200(V32t) 16800(V32t) 14400(V32b) 12000(V32b) 9600(V32b) 7200(V32b) 4800(V32b) 2400(V22bis)
14400(V33) 12000(V33) 9600(V29) 7200(V29) 4800(V29)
User’s Guide, pp. 8-43–8-44.
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.
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.
NOTE: The modem must be in Direct mode before the modulation scheme can be changed from V.32bis to another
leased-line modulation (V.33, V.29, or V.22bis). See Err Contrl Mode configuration option in your User’s Guide
for more about Direct mode. On leased lines, V.42 error control and Buffer mode are only supported by
V.32bis. An error occurs if the modem is not in Direct mode when the modulation is changed from V.32bis.
2400(V.22bis) – This modulation scheme is available on 2-wire and 4-wire leased lines.
14400(V.33), 12000(V.33), 9600(V.29), 7200(V.29), 4800(V.29) – These optional modulation schemes are available only
on 4-wire leased lines and are not available for the Model 3820.
NOTE: It is recommended that both modems use the same fixed data rate.
The factory default is 19200(V32t).
AT command is S-Register S44=
n, where n is:
0, 1 = 14,400 bps (V.32bis)
12 = 12,000 bps (V.33)
2 = 12,000 bps (V.32bis)
13 = 9600 bps (V.29)
3 = 9600 bps (V.32bis)
14 = 7200 bps (V.29)
4 = 7200 bps (V.32bis)
15 = 4800 bps (V.29)
5 = 4800 bps (V.32bis)
18 = 19,200 (V.32
terbo; default)
6 = 2400 bps (V.22bis)
19 = 16,800 (V.32
terbo)
11 = 14,400 bps (V.33)
This configuration option is only available if the Sync Leased factory preset template is selected.
