PVDM-12 for Cisco Voice Gateway Router
I have a cisco 1760 Voice Gateway router with a VIC2-4FXO card with 4 analog phone lines, and a PVDM-12 module. Will this PVDM-12 support another VIC2-4FXO card with 4 more analog phone lines, which would total 8 lines. I know the "12" means 12 channels, but I didn't know if one pots line took two channels for communication. If this was the case I could only have 6 pots lines right? Any assistance would be greatly appreciated. I'm looked at the PVDM-12 datasheet and its not answering my questions.
ASKER
I'm using G.711, so technically since a PVDM-12 has 12 channels if I had a total of 12 FXO ports, I could have 12 calls going on at once right?
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Thanks
http://www.cisco.com/en/US/products/hw/routers/ps221/products_data_sheet09186a00800920f2.html
Under DSP Requirements it says:
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Please use the following rules for calculating DSP requirements on the Cisco 1760 series routers:
1. For 12.2T releases:
a. Each 2-port analog VIC requires 1 DSP (PVDM-256K-4)
b. Each VIC-2BRI-NT/TE requires 2 DSPs (PVDM-256K-8)
c. For VWICs, refer to Table 10. For example, 12 G.711 digital T1/E1 voice calls require two DSPs; 12 G.729 calls require four DSPs
d. Total DSP requirement is the sum of a, b and c. The DSP resources can not be shared between analog VICs and VWICs
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So if you have a PVDM-256K-12 you have 3 DSPs.
Then down below that there is table 10 which shows that for a medium complexity you can support 4 channels per DSP for G.711 or G.729. If you run high complexity you can only have 2 per DSP.
So if you run a total of 8 ports of FXO and you run medium complexity you should be able to support that with your current DSPs.
Hope that helps.