Reset; Dial-Up Delay; Error Correction; V42 Error Correction - Siemens Insys 56k Operating Manual

Function
5.2.7

Reset

There are two reset options:
A reset is performed after the power supply has been interrupted for a
short time.
With the help of the terminal program
After the software reset, load the user profile 0
After the software reset, load the user profile 1
5.2.8

Dial-up Delay

According to the TBR 21 regulations, after 12 futile dial-up
attempts each further dial-up is locked within 2 hours. In this case,
the modem must be temporarily switched off.
The counter is automatically reset after each successfully
established connection.
After the connection has been established, a dial delay of 5
seconds is observed.
5.3

Error Correction

The modem masters the V.42 error correction protocol including
the Microcom Networking Protocol Levels 2/3/4 (MNP2, MNP3,
MNP4) and the data throughput optimization MNP10.
5.3.1

V42 Error Correction

The V.42 error correction includes the protocols LAPM (Link Access
Procedure for Modem) and MNP 4. LAPM is the preferred error
correction.
MNP 4 is supported for compatibility reasons with other MNP
modems. Both methods determine frames to transfer net data
and use CRC (Cyclic Redundancy Check) check sums for error tests.
In V.42, the possibility exists to have the modem identify if the
partner is a V.42 modem, a MNP modem, or a modem without
error correction. The modem can then autonomously adjust to the
partner.
10
Pocket Modem 56K
ATZ0 ATZ
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Dezember 05