Multi-Tech Systems MTA128ST-USB User Manual
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Chapter 4 - AT Commands, S-Registers and Result Codes
MTA128ST-USB
S-Register: S53
Function:
Maximum X.75 Buffer Size
Unit:
1 byte
Range:
n=64 - 2048
Default:
2048 (bytes)
Description: S53 allows the maximum buffer size of an X.75 frame to be customized.
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.
S-register: S54
Function:
Force 56 Kbps B-Channel Data Rate
Unit:
Decimal ASCII code
Range:
n=56 (Kbps) or 64 (Kbps)
Default:
64 (Kbps)
Description: S54 can be used to force a 56 Kbps B-channel data rate in order to make 56
Kbps data calls.
S-Register: S55
Function:
POTS Port Call Control
Unit:
Decimal ASCII code
Range:
1, 2, 17, 18
Default:
1
Description: Allows you to set the type of information transfer capability for calls placed
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
S-register: S56 (applies to NET3 [!C0=2] switch type only)
Function:
Calling Party Number IE Settings
Unit:
decimal ASCII code
Range:
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