Cabletron Systems CSMIM-T1 - Manual (Page 147)

Commands
CSMIM-T1 Hardware Installation Guide 7-21
Table 7-4 Modem Connections When %L1 or %L3 is Set
The following chart indicates the connections that the modem can
establish when %L4 is set. Both modems must support the V.8 protocol
when using %L4 or a connection will not be made.
NOTE
When both the originate and answer modems are V.8 modems,
setting 300 bps will make a V.21 connection.
Mode Setting on
Originating Modem
Mode Setting on Answer Modem
Bell212A Bell103
V.34 (2400-28,800) V.22[a] —
V.FC (14,400-28,800) V.22 —
V.32bis (4800-14,400) V.22[a] —
V.32 (4800-9600) V.22[a] —
V.22bis (2400) V.22[a] —
V.22[a] (1200) V.22[a] —
V.22[b] (600) — —
Bell212A (1200) Bell212A Bell212A
Bell103 (300) Bell103 Bell103