What is the function of the DSP module of an AR router

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The DSP module in an AR router is used to play announcements (such as the dialing tone and ring back tone), mix audios, collect digits, and encode and decode audios.
It is recommended that AR2200 and AR3200 series routers should equip with DSP modules if the audio function is featured on the routers.

Other related questions:
What are the functions of the DSP module
DSP is short for digital signal processing. The DSP module supports the following functions: playing voice such as the dial tone and RBT tone, mixing voice, collecting digits, and encoding and decoding voice. To use the voice feature on the AR2200 and AR3200 series routers, you are advised to install the DSP module.

How to check the resource usage of the DSP module of an AR router
You can check the resource usage of the DSP module of an AR router as follows: - In V200R002C00 and earlier versions Run the display voice dsp-dimm state { slot/dsp-index | channel slot/dsp-index/channel } command. Check the idle field in the displayed output information to determine whether there are remaining DSP resources. For example: display voice dsp-dimm state 15/0 Symbol: 0-idle $-G.711 busy A-All busy W-Wastage X-fault @-IP loopback *-PCM loopback #-prohibited Channel NO. DSP channel state ---------------------------------------------------------------------- 0000-0049 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 0050-0099 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 0100-0149 00000 00000 00000 00000 00000 000 Total: 128 DSP channel 128 idle, 0 G.711 Busy, 0 All Busy, 0 Wastage, 0 Fault, 0 IP loopback, 0 PCM loopback, 0 prohibited In the information above, the 128 idle message is displayed. It indicates that 128 DSP channels are idle, that is, DSP resources are sufficient currently. - In versions later than V200R002C00 Run the display voice dsp state { slot/dsp-index | channel slot/dsp-index/channel } command. Check the idle field in the displayed output information to determine whether DSP resources are left. For example: display voice dsp state 15/0 Symbol: 0-idle $-G.711 busy A-All busy W-Wastage X-fault @-IP loopback *-PCM loopback #-prohibited Channel NO. DSP channel state ---------------------------------------------------------------------- 0000-0049 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 0050-0099 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 0100-0149 00000 00000 00000 00000 00000 000 Total: 128 DSP channel 128 idle, 0 G.711 Busy, 0 All Busy, 0 Wastage, 0 Fault, 0 IP loopback, 0 PCM loopback, 0 prohibited In the information above, the 128 idle message is displayed. It indicates that 128 DSP channels are idle, that is, DSP resources are sufficient currently.

A DSP module does not work properly
The problem may be caused by the following reasons: 1. The DSP DIMM module is not installed or not properly installed. 2. An audio license file is not installed on the system. For details, see the following URL: DSP无法正常工作

Functions of LLDP on an AR router
The Link Layer Discovery Protocol (LLDP) is a standard Layer 2 topology discovery protocol defined in IEEE 802.1ab. It can identify the interfaces on a network device and provide detailed information about connections between devices. It can also display paths between clients, switches, routers, application servers, and network servers.

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