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3GPP TS 27.007 AT CO

MMANDS

AT Commands for EV-DO-EV3 Modems

Multiplexing Mode +CMUX

Set command +CMUX enables or disables the 3GPP TS 07.010 multiplexing protocol control channel.

Set command +CMUX <fwd>,<rev> sets the number of forward and reverse data call links and indicates if default

service is Rate Set 1 or 2.

Read command returns the current value of <fwd>, <rev>

+CMUX: <fwd>,<rev>.

Test command returns the range of supported values for <fwd> and <rev>.

Syntax

Command Command type

AT+CMUX=<mode> Set

AT+CMUX=<fwd>,<rev> Set

AT+CMUX? Read

AT+CMUX=? Test

Parameters and Values

<mode> Multiplexer transparency mechanism.

0 Basic option. Currently the only supported value.

<fwd > The forward MUX option specified in hexadecimal format.

1~F

<rev> The forward MUX option specified in hexadecimal format.

1~2

Notes

 Entering the multiplexed mode starts an inactive five second timer. If no CMUX control channel is

established before this inactivity timer expires, the engine returns to AT Command mode.

 All the CMUX protocol parameters are fixed as defined in GSM07.10 and cannot be changed.

 Maximum frame size is fixed: N1=128.

 Channel 1 handles all functions (voice call, data call, SMS, and AT commands). Channel 2 handles all

functions, except the data call. Channel 3 is only the DM for debugging. Channel 4 is only the NMEA for GPS.

 If <rev> is omitted, it is assumed to have the same value as <fwd>.

 Reference: 3GPP TS 27.007, 3GPP TS 27.010, CL93-V0327-1F.

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Multitech CDMA Guía de usuario Pagina 54