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Status Registers
Operating Mode — S70
The S70 register determines the protocol operating mode and action
taken on an MNP link attempt failure. LAPM is assigned highest
priority.
Example: With \N7 selected the modem tries an LAPM connection
first; if unsuccessful the modem tries an MNP connection; if also
unsuccessful, the modem connects in normal mode. Modes allowing
protocol fallback are referred to as auto-reliable.
Bit
Value
Command
2-0 000
\N
001
\N1
010
\N2
011
\N3
100
\N4
101
\N5
110
\N6
111
\N7
3
0
\M
1
\M1
7-4 --
--
Operating Mode Status — S71
The S71 register indicates the level of error controlling protocol. This
register is for reference only.
Bit
Value
Command
--
2-0 000
001
010
011
100
101
110
111
7-3 --
--
10-22
Description
Normal
Direct
MNP only (reliable)
MNP or normal (auto-reliable)
LAPM only (reliable)
LAPM or normal (auto-reliable)
LAPM or MNP only (auto-reliable)
LAPM or MNP or native (auto-reliable)
Disable V.42 fast detect
Enable V.42 fast detect
Reserved
Description
Protocol not active
Protocol negotiation in progress
MNP level 2 active
MNP level 3 active
MNP level 4 active
MNP level 5 active
LAPM active
LAPM with data compression active
Reserved
V.3600
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