Re : Digital Links

[TrunkMan]

I have a MXe controller on version 4.0sp3 and no IP users/voicemail/ACD. It is being used only as a trunking gateway. I also have the expansion kit installed. How many digital links can I use on this system without using additional DSP's ? Does the T1/E1 have its own DSP resources as well ?

Thanks for your responses.

 

[Supernova99]

You do not need any additional DSP resources for trunks.

The MXe supports up to 8 embedded T1/E1 trunks. (or Max 16 if using NSU/DSU) You will need to make sure if you have this size config that you have a E2T card (2nd processor) and more echo cancellers so that you have enough resources to process the calls.
There is more info in the engineering guidelines.

The trunks are expected to be busy 75% to 100% of the time. Therefore the number of trunks and the number of E2T channels are directly linked. The maximum number of trunk channels is about 120 channels, or 4 E1 / 5 T1 links on the large controllers (to match the 128 E2T channels), and 60 channels for the smaller units (64 E2T channels). In the MXE Controller 192 gateway, the maximum number of trunks would be 180 E1 trunks (6 links) or 192 T1 trunks (8 links).

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[TrunkMan]

Many thanks for your response supernova. But, if we have 8 E1 MMC's which is 240 channels, doesnt that exceed the max of 120 ? or does this refer to a system that is not expanded ?

 

[TrunkMan]

Sorry I ment 4xE1 MMC's with all 8 ports used.

 

[IrwinMFletcher]

First off, no, the T1/E1 module does not have it's own dsp resources, however as supernova stated, you should have enough on the base system to perform the trunking. The max you can have is 192 channels in use at one time, and that is a limitation of the E2T ports and the echo cancelers, not the trunks themselves.

From my understanding, you can 'use' all 240 channels. i.e. they can all be provisioned, however only 192 can ever be active in a trunking call at any one time.

 

[TrunkMan]

Does this mean, that even if I have an expansion kit(E2t processor and echo canceller) which upgrades from 64 E2t channels to 128 channels and if I add in a DSP 2, I would then have a 192 gateway system, which will support up to 180 E1 channels ?

 

[IrwinMFletcher]

The 192 gateway is a unique hardware configuration, it should be in the Tech Handbook somewhere, I don't have it handy to check.

It requires (IIRC) 2 DSP II cards, at least 3 T1/E1 modules, and a 128 channel VEC. As well as the obvious E2T expansion card.

Do an 'e2tshow' from the shell and you should be able to see if it's in that mode.