Chapter 7: AT Commands and Registers
7-20 CSMIM-T1 Hardware Installation Guide
%L
n
Speed Matching
%L0 Provides partial speed matching.
%L1 Enables speed matching.
%L2 Disables speed matching.
%L3 Enables V.8 Automode with fallback to ITU-T Automode.
%L4 Enables V.8 Automode only.
Determines whether the modem uses speed matching to establish
a connection.
Table 7-3 and Table 7-4 indicate the connections that the modem can
establish when %L1 or %L3 is set.
Table 7-3 Modem Connections When %L1 or %L3 is Set
NOTE Both modems must support the V.8 protocol when using %L4
or a connection will not be made.
Mode Set-
ting on
Originating
Modem
Mode Setting on Answer Modem
V.22[b] V.22[a] V.22bis V.32 V.32bis V.FC V.34
V.34
(2400-28.8) — V.22[a] V.22bis V.32 V.32bis V.FC V.34
V.FC
(14.4-28.8) — V.22[a] V.22bis V.32 V.32bis V.FC V.FC
V.32bis
(4800-14.4) — V.22[a] V.22bis V.32 V.32bis V.32bis V.32bis
V.32
(4800-9600) — V.22[a] V.22bis V.32 V.32 V.32 V.32
V.22bis
(2400) — V.22[a] V.22bis V.22bis V.22bis V.22bis V.22bis
V.22[a]
(1200) — V.22[a] V.22[a] V.22[a] V.22[a] V.22[a] V.22[a]
V.22[b]
(600) V.22[b] ——————
Bell212A
(1200) — V.22[a] V.22[a] V.22[a] V.22[a] V.22[a] V.22[a]
Bell103
(300) — Bell103 Bell103 Bell103 Bell103 Bell103 Bell103