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

Description

 

 

 

 

2-0

000

\N

Normal

 

001

\N1

Direct

 

010

\N2

MNP only (reliable)

 

011

\N3

MNP or normal (auto-reliable)

 

100

\N4

LAPM only (reliable)

 

101

\N5

LAPM or normal (auto-reliable)

 

110

\N6

LAPM or MNP only (auto-reliable)

 

111

\N7

LAPM or MNP or native (auto-

 

 

 

reliable)

 

 

 

 

3

0

\M

Disable V.42 fast detect

 

1

\M1

Enable V.42 fast detect

 

 

 

 

7-4

--

--

Reserved

 

 

 

 

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

--

Protocol not active

 

001

 

Protocol negotiation in progress

 

010

 

MNP level 2 active

 

011

 

MNP level 3 active

 

100

 

MNP level 4 active

 

101

 

MNP level 5 active

 

110

 

LAPM active

 

111

 

LAPM with data compression active

 

 

 

 

7-3

--

--

Reserved

 

 

 

 

Modem 3600

10-23

Page 167
Image 167
Black Box 3600 MODEM manual Operating Mode S70, Operating Mode Status S71, 111 \N7 Lapm or MNP or native auto Reliable