Westermo ID-90 - Manual (Page 26)

26 6607-2204
&D – DTR control
Selects the behaviour of the ID-90, when the DTE control line DTR changes from ON
to OFF.
AT&D0DTR is evaluated: ignored
AT&D2
DTR is evaluated: dropping the DTR line by the DTE will disconnect
an existing ISDN connection. An incoming call will
accepted only with DTR active. (default)
AT&D4 DTR is evaluated: Incoming calls will be accepted independent of
DTR status; DTR drop disconnects an active connection
!+DS – Data Compression
This extended-format compound parameter controls the V.42bis data compression func-
tion if provided in the modem. It accepts four numeric subparameters:
AT!+DS=[<direction>[,<compr_neg>[,<max_dict>[,<max_string>]]]]
<direction> Specifies the desired direction(s) of operation of the data compres-
sion function; from the DTE point of view.
0
Negotiated; no compression (V.42bis P0=0).
3 both directions, accept any direction (V.42bis P0=11). (default)
<compr_neg> Specifies whether or not the modem should continue to operate if the
desired result is not obtained.
0Do not disconnect if V.42bis is not negotiated by the remote
modem as specified in <direction>
<max_dict> Specifies the maximum number of dictionary entries (2 048 entries)
which should be negotiated (may be used by the DTE to limit the
codeword size transmitted, based on its knowledge of the nature of
the data to be transmitted).
<max_string> Specifies the maximum string length (32 bytes) to be negotiated
(V.42bis P2).
Reporting Current or Selected Values
Command: AT!+DS?
Response: +DS: <direction>,<compr_neg>,<max_dict>,<max_string>
Example: +DS: 3,0,2048,32 for the defaults and 2048 entry max dictionary
Reporting Supported Range of Parameter Values
Command: AT!+DS=?
Response: +DS: (<direction>range),(<compr_neg>range),
(<max_dict>range),(<max_string>range)
Example: +DS: (0,3),(0),(2048),(32)
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