Black Box MD1000A Guía de usuario Pagina 168

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Status Registers
Modem 3600 10-23
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.
Operating Mode Status S71
The S71 register indicates the level of error controlling protocol. This
register is for reference only.
Bit Value Command Description
2-0 000
001
010
011
100
101
110
111
\N
\N1
\N2
\N3
\N4
\N5
\N6
\N7
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)
30
1
\M
\M1
Disable V.42 fast detect
Enable V.42 fast detect
7-4 -- -- Reserved
Bit Value Command Description
2-0 000
001
010
011
100
101
110
111
-- 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
7-3 -- -- Reserved
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