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Max number of PRI ports in a ISR G2 3945

news2010a
Level 3
Level 3

Hi, can you help me confirm how to find the maximum number of PRIs supported on a given router:

Let's say I need to find maximum number of PRIs I can connect on a C3945.

I see that I could buy  for example (4) VWIC3-4MFT-T1/E1. The C3945 comes with (4) EHWICs where such VWIC3-4MFT-T1/E1 cards can be inserted.

Since each VWIC3 has (4) ports each, that would be total of 16 PRIs.

Then let's say I want to put more Service Modules and allow me to expand it further.

The C3945 can support up to (4) service modules.

If I want to put the maximum number of PRIs possible, is it right I could install (4) NM-8CE1T1-PRI

That would give me maximum of 48 PRIs in a C3945.

Please confirm this is right.

1 Reply 1

shillings
Level 4
Level 4

The following webpage will help. It will enable you to calulate the required DSP resourse for the PRIs, but will also allow you to find out Which cards can be fitted to the 3945 router. Bear in mind the difference between E1 and T1 in terms of DSP resourse: -

http://www.cisco.com/web/applicat/dsprecal/dsp_calc.html

The following example is using E1, not T1. The NM-HDV2-2T1/E1 doesn't appear to take the VWIC3-2MFT, only the VWIC2-2MFTs, so haven't included those: -

Router: 3945
IOS: 15.1(4)M
DSP Modules Required:
PVDM3-256: 2
DSP Module Allocation:
Router Slot 0:480 Voice (94%) 32 Available (6%)
PVDM Slot 0/0: PVDM3-256PVDM Slot 0/1: PVDM3-256
Call Volume Allocation:
Router Slot 0LowMedHigh
Slot 0/0: VWIC3-4MFT-T1/E1(E1)120
Slot 0/1: VWIC3-4MFT-T1/E1(E1)120
Slot 0/2: VWIC3-4MFT-T1/E1(E1)120
Slot 0/3: VWIC3-4MFT-T1/E1(E1)120
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