Cabletron Systems CSMIM-T1 manual Speed Matching, Provides partial speed matching

Chapter 7: AT Commands and Registers

%Ln	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.

NOTE

Both modems must support the V.8 protocol when using %L4 or a connection will not be made.

Table 7-3and Table 7-4indicate the connections that the modem can establish when %L1 or %L3 is set.

Table 7-3 Modem Connections When %L1 or %L3 is Set

	Mode Setting on Answer Modem
Mode Set-
ting on	V.22[b]	V.22[a]		V.22bis		V.32		V.32bis	V.FC	V.34
Originating
Modem
V.34	—	V.22[a]		V.22bis		V.32		V.32bis	V.FC	V.34
(2400-28.8)
V.FC	—	V.22[a]		V.22bis		V.32		V.32bis	V.FC	V.FC
(14.4-28.8)
V.32bis	—	V.22[a]		V.22bis		V.32		V.32bis	V.32bis	V.32bis
(4800-14.4)
V.32	—	V.22[a]		V.22bis		V.32		V.32	V.32	V.32
(4800-9600)
V.22bis	—	V.22[a]		V.22bis		V.22bis		V.22bis	V.22bis	V.22bis
(2400)
V.22[a]	—	V.22[a]		V.22[a]		V.22[a]		V.22[a]	V.22[a]	V.22[a]
(1200)
V.22[b]	V.22[b]	—	—		—		—	—	—
(600)
Bell212A	—	V.22[a]	V.22[a]			V.22[a]		V.22[a]	V.22[a]	V.22[a]
(1200)
Bell103	—	Bell103	Bell103			Bell103		Bell103	Bell103	Bell103
(300)

7-20 CSMIM-T1 Hardware Installation Guide