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Configure Branch
9-293810-A2-GB30-20 November 1996
Leased Line
The Leased Line configuration options are used to
configure the modem for operation over leased lines.
The Leased Line configuration group only appears if
the modem is configured with the Sync Leased factory
preset template, or when the &L1, &L2, &L3, or &L4
command is issued.
Table 9-5 shows each Leased Line configuration option
as it appears on the LCD, with the Async Dial factory
default setting (the default value if the modem is just
being installed) shown following the colon (:) on the first
line and with all available selections listed on the second
line. Following this is a description of the configuration
option, a description of the available selections, and any
equivalent A
T commands.
Table 9-5
(1 of 5)
Leased Line Configuration Options
Leased Mode: 4WLL-Orig
Nxt 4WLL-Orig 4WLL-Ans 2WLL-Orig 2WLL-Ans
Leased Mode. Sets the modem for either 2-wire or 4-wire operation in Answer mode (receiving a call) or 2-wire or 4-wire
operation in Originate (initiating a call) mode. The only options available for Model 3820 modems are 2WLLOrig and
2WLL-Ans.
NOTE:
For proper operation over leased lines, one modem must be set for Originate mode and the other set for Answer
mode.
For Sync Leased Answer Mode, 4-wire Answer is the factory default. (Two-wire Answer for the Model 3820.)
For Sync Leased Originate Mode, 4-wire Originate is the factory default. (Two-wire Originate for the Model 3820.)
AT command for Disable is &L0.
AT command for 2-wire Originate is &L1.
AT command for 4-wire Originate is &L2.
AT command for 2-wire Answer is &L3.
AT command for 4-wire Answer is &L4.
LeasedLine Rate: 14400(V32b)
Nxt 19200(V32t) 16800(V32t) 14400(V32b) 12000(V32b) 9600(V32b) 7200(V32b) 4800(V32b) 2400(V22bis)
Leased-Line Rate. Determines the modem’s data rate and modulation scheme for operation on leased lines.
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 or V.22bis). See Err Contrl Mode configuration option 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. In asynchronous mode using V.22bis, the
DTE rate must equal the leased-line rate.
2400(V.22bis) – This modulation scheme is available on 2-wire and 4-wire leased lines.
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) 5 = 4800 bps (V.32bis)
2 = 12,000 bps (V.32bis) 6 = 2400 bps (V.22bis)
3 = 9600 bps (V.32bis) 18 = 19,200 (V.32
terbo
; default)
4 = 7200 bps (V.32bis) 19 = 16,800 (V.32
terbo
)