CMX228S1 MX-COM, Inc., CMX228S1 Datasheet - Page 20

• Manufacturer Part Number: CMX228S1
• Description: ISDN data and telephony protocol engine with x.25
• Manufacturer: MX-COM, Inc.

ISDN Data and Telephony Protocol Engine with x.25
S37 (Maximum Rate Adaption Speed)
This forces the baud rate when handling incoming calls, to that defined by the S37 register contents, provided
auto-answer is set. Once a call is terminated the baud rate remains that set by the S37 register.
%A2 (CSD Protocol)
Selects the protocol to be used for the circuit switched data calls. Note that %A2 cannot be changed while a
B or D-channel call is active.
4.6.2.1 X.25 Virtual Circuit Parameters
All %B registers can be read using the %Bn? command.
%B0 (X.25 Receive Window Size)
Defines the maximum number of X.25 packets that may be received before an acknowledgement is sent.
%B1 (X.25 Transmit Window Size)
Defines the maximum number of X.25 packets that may be transmitted before an acknowledgement is
expected. Use of the default value is recommended.
%B2 (X.25 Receive Packet Size)
Defines the maximum number of bytes that may be received in an X.25 packet.
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Value
0 (default)
9
12
13
18
31
Value
2 (default)
3
4
5
6
15
20
Value
0 (default)
1 to 7
Value
0 (default)
1 to 7
Value
0 (default)
7
8
9
10
Rate (baud)
Same as last AT speed
9600
19200
38400
57600
115200
Description
V.120 Rate Adaption on B-channel.
Voice Calls.
X.25 Rate Adaption on B-channel.
X.25 packet calls on D-channel.
X.25 to a packet switched data network reached by a B-channel data
call. This involves a two stage call set up. Firstly a circuit switched call
must be established to the X.25 node, followed by a virtual call to an X.25
destination. The ATD command is used for both call requests.
PPP.
Transparent protocol.
Description
Use the default value appropriate to the type of call, without negotiation,
see %D registers.
Negotiate the receive window size according to the value entered.
Description
Use the default value appropriate to the type of call, without negotiation,
see %D registers.
Negotiate the transmit window size according to the value entered.
Description
Use the default value appropriate to the type of call, without negotiation,
see %D registers.
Negotiate for a maximum 128 bytes per packet.
Negotiate for a maximum 256 bytes per packet.
Negotiate for a maximum 512 bytes per packet.
Negotiate for a maximum 1024 bytes per packet.
20
2000 Chiron Technology Limited
CMX228 Advance Information
Doc. # 20480216.001
2000 MX-COM, Inc.