Telit LE910 V2 Series AT Commands
80446ST10707A Rev. 0– 2015-11-03
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 276 of 509
Mod. 0808 2011-07 Rev.2
#CMUXMODE – CMUX Mode Set
If not set explicitly, the module preserves the previous value
0 – Disable the buffer_size limitation (default)
28 – 16384 Resize the internal cmux output buffer to the selected value.
When a cmux session will be started using AT+CMUX, this value might
be increased; if it is less than (N1 * 4), it becomes exactly N1 * 4. The
current value can be gotten using the read command.
The cmux out buffer contains the frames ready to be sent for every DLCI.
If the modules receives an MSC indicating a RTS state to lock the data
flow, these frames (already in the buffer) will be sent.
The default size of these buffer is about 32k.
Note: a software or hardware reset restores the default value.
Note: during a cmux session the set command will fail, only the read and
test command can be used
Note: reducing the buffer_size will change the behaviour of cmux.
Several test have been performed using N1=122 at 115200bps =>
buffer_size = 488:
- the bandwidth is decreased by 15%
- the bandwidth is not equally
distributed, the first channel has the
max priority, then the second and the third
Note: if the module is downloading a lot of data and the application
processor lock the flow moving the logical RTS (with MSC), the module
can send more than buffer_size data
Read command reports the currently selected <mode> in the format:
#CMUXMODE: <mode>,<buffer_size>
Test command reports the supported range of values for parameter
<mode> and <buffer_size>
Response:
#CMUXMODE: (1,5,13),(0,28-16384)
Fast Dormancy - #FDOR
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