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S-Register: S53
Function:
Unit:
Range:
Default:
Description:S53 allows the maximum buffer size of an X.75 frame to be customized.
S-register: S54
Function:
Unit:
Range:
Default:
Description:S54 can be used to force a 56 Kbps B-channel data rate in order to make 56
S-Register: S55
Function:
Unit:
Range:
Default:
Description:Allows you to set the type of information transfer capability for calls placed
S-register: S56 (applies to NET3 [!C0=2] switch type only)
Function:
Unit:
Range:
MTA128ST-USB
Chapter 4 - AT Commands, S-Registers and Result Codes
Maximum X.75 Buffer Size
1 byte
n=64 - 2048
2048 (bytes)
Typically a smaller frame size is more compatible with software packages on
a PC (such as HyperTerminal). Larger frame sizes introduce larger delay
which some software cannot deal with appropriately.
Force 56 Kbps B-Channel Data Rate
Decimal ASCII code
n=56 (Kbps) or 64 (Kbps)
64 (Kbps)
Kbps data calls.
POTS Port Call Control
Decimal ASCII code
1, 2, 17, 18
1
from the POTS port either by a telephone, modem, or fax. Some Central
Office (CO) switches keep track of the type of line each customer has, and if
that line is labeled as a data line (modem or fax), it will not accept a speech
call originated on that line. However, 3.1 kHz audio information transfer
capability is allowed on data lines (modem or fax) by most switches. S55
also lets you define whether a progress indicator information element (which
indicates that the origination address of the POTS call is non-ISDN) is sent
with the SETUP message for the POTS port call. This may help POTS port
calls get through certain CO switches.
S1
Speech, no progress indicator
S2
3.1 kHz Audio, no progress indicator
S17
Speech, origination address is non-ISDN
S18
3.1 kHz Audio, origination address is non-ISDN
Calling Party Number IE Settings
decimal ASCII code
128
Disable
Type of Number
0
Unknown,
16
International
32
National
48
Network specific
64
Subscriber
96
Abbreviated
Numbering Plan
0
Unknown
1
ISDN/telephony
3
Data
49
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