Index:
IntroductionThe DSP Audio Module A900 for M900 enables additional audio codecs for the M900 base stations.
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Note: In a muti-cell set-up, each connected base needs this module to enable the additional codecs. |
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Part-Number: 00004445
The DSP modules adds support for the following audio codecs:
- VOIP codecs
- G.729 with Annex A and optional B (NB, 8 kbit/s)
- BroadVoice32 (BV32) (WB, 32 kbit/s) (V530B2 or later)
- Opus (NB/WB, 10-24 kbit/s) (V500B1 or later)
- DECT codecs
- BroadVoice32 (BV32) (WB, 32 kbit/s, 1 DECT slot)
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- Support of SILK 10 or 20 ms framing. this means that we can handle the following:
- NB 20 ms framing – 8 calls
- NB 10 ms framing – 6 calls
- WB 20 ms framing – 5 calls
- WB 10 ms framing – 3 calls
- Supported sample rates limited to 16 kHz (SDP parameter maxplaybackrate=16000 and sprop-maxcapturerate=16000) and 12 kHz, 8 KHz.
- No CELT. Only support for the Opus bitstream and the SILK codec. No support for CELT
- Opus frame size of 10 or 20 ms. SDP parameter ptime=20 or ptime=10, indicates this, but this parameter just gives the RTP Packet size and as no absolute size is present in a opus package, one RTP package must contain one opus package.
- Mono (SDP stereo=0).
- Opus packages of type: Code 0 (One Frame in a Packet)
- No Discontinuous Transmission (DTX) support (SDP usedtx=0), but tolerate it
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This is a step-by-step installation manual.
- Remove the wall mount plate by sliding it upwards while the cable guide is pointing downwards.
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- Disconnect the base station from its power source and remove the network cable. Then, unscrew the Torx screw marked in the below picture.
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- Replace the cover plate with the A900 DSP module, which is delivered pre-mounted in its a cover plate. After inserting the A900 DSP module, tighten the Torx screw that holds the module cover in place.
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Reconnect the base to its power source and the network and check the Syslog in the WebUI to confirm the DSP module was detected properly.
→ Syslog message: loc5 .Debug 1970-01-01T00:00:03Z 173-[ DSP module detected and initialized.]
In the WebUI under the "Servers" section you can see the available codecs displayed in a list at the very bottom.
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Now you can add the additional codecs.
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Note: Only the top 5 codecs in the list will be used.
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