Cisco 2911 Max Voice E1 Support

[Martin Marino]

Hi everyone!

I would like to know what is the maximun voice E1s that a Cisco 2911 can support.  According to the datasheet there are 4 HWIC slots available. But on old ISR 2800 there was a limitation of maximun voice E1s

So, the Q: is it possible to have 4 voice E1s on a 2911?

Regards,
Martin

[Priyadarshini B.T]

Hi Martin,

The Cisco 2900 series routers comes with four integrated Enhanced High-Speed WAN Interface Card (EHWIC) slots. 
So, they can support upto a maximum of 4 T1 cards. 
please refer the link below for further information,

http://www.cisco.com/en/US/prod/collateral/routers/ps10537/data_sheet_c78_553896.html

please rate if this helps.

[Martin Marino]

So, the limitation that the old 2800s have is not present on 2900s? I'm asking because on previous 2800 the datasheet also says "4 HWIC slots" but only two VOICE E1 are supported.

Regards,

Martin

[acampbell]

Hi

Using the dsp calculator

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

CCO login required.

2911 - Max 4 x E1 PRI with G711 and 30 channels on each.

Fit 2 x PVDM2-64 DSP chips. This is the routers maximum capacity.

There is no DSP resource left to either vary the codec complexity or to use for transcoding etc.

Hope this helps

Alex

[Martin Marino]

Thanks for the reply.

So i would also put 4 HWIC with 2 E1's each, so having 8 E1s on the 2911? I need to know if there is a perfomance limit apart from the physical availability of hwic slots.

THnks!

[acampbell · Accepted solution]

Hi,

No

You can only have a max of 4 E1 PRIs

You can use

4 x 1 PORT E1 or

2 x 2 PORT E1 or

2 x 1 PORT E1 + 1 x 2 PORT E1

No more

Plus , remember you need to max out the DSPs to 2 x PVDM2-64 if you want all 4 E1s to run.

Hpoe this helps

Alex

[Martin Marino]

Thanks a lot! That's what i needed o know. So 4 E1's PRIs is tha max supported on a 2911

Best Regards,

Martin

[kencraft]

The 2911 uses PVDM3s which can scale beyond 64 per.

Sent from Cisco Technical Support iPhone App

[Marwan ALshawi]

it is better to test it before use in  production, because sometimes even if you have enough bandwidth, DSP..etc the CPU utilization might be high and in this case you need to consider higher model like 3900 for example

HTH

if helpful rate

[willembrey]

I believe the original answer is wrong. The following link gives the total supported channels on all the platforms on table 6.

http://www.cisco.com/en/US/prod/collateral/routers/ps259/product_data_sheet0900aecd8057f2e0.pdf

Max E1 channels for the 2911 is stated as 600. I can't see any reason why you can't use more than 2 x 2 port E1 card.

Happy to be corrected if wrong.

[Ayodeji Okanlawon]

Willembrey,

Looks like you have a point. With a combination of vwic3-4MFT T1/E1 you can have upto 600 e1 channels. The output below is what the dsp calculator showed.

Router: 2911

IOS: 15.1(4)M

DSP Modules Required:

PVDM3-256: 2

PVDM2-64: 2

DSP Module Allocation:
Router Slot 0:		480 Voice (94%) 32 Available (6%)
PVDM Slot 0/0: PVDM3-256	PVDM Slot 0/1: PVDM3-256
Router Slot 1:		120 Voice (94%) 8 Available (6%)
PVDM Slot 1/0: PVDM2-64	PVDM Slot 1/1: PVDM2-64
Router Slot 2:
Router Slot 3:
Router Slot 4:

Call Volume Allocation:
Router Slot 0		Low	Med	High
	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
Router Slot 1: NM-HDV2-2T1/E1(E1)		60
	Slot 1/0: VWIC2-2MFT-T1/E1(E1)	60

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