What PVDM-256k should I load into my 1760?

Corndork2

What size PVDM-256k should I put into my 1760. What gives the best cost to DSP channel ratio? I can get PVDM-256K-4's for about thrity bucks, so if I filled both slots it would run me $60. Does that give me enough DSP channels? Should I spend more and get - 8 or -12 PVDM's? What do you guys run in your labs? Thanks for the help.

azaghul

A 256K-4 will let you run 2FXS, 2FXO
A 256K-8 (or 2 256K-4's) will let you run 2FXS, 2FXO, plus 1 conference channel or up to 6 E1/T1 channels

Or if you're on a tight budget, just get the 256K-4 and then plug and play the VICs as needed.

Check here for more into on 1700 series DSP usage:

hxxp://www.cisco.com/en/US/docs/routers/access/1700/1751/software/feature/guide/dsp_cn.html

pitviper

I guess it really depends on your study goals – If you just want to play around with some analog interfaces, then as azaghul said the best bang for the buck would be to get the PVDM-256K-4 and swap out VICs/VWICs. If you plan on going a little deeper and might possibly want to build a PSTN cloud, then get more DSP resources now, and eventually you can run a couple of network side PRIs on it later down the road.

Corndork2

I want to get the most functionality that I can. Can I mix and match unlike PVDM sizes? Since I'm budget limited, I'm thinking of doing one PVDM-256k-4 and one 2FXS card in my 1760... then adding another PVDM-256k-8 or bigger and the 2FXO later in the summer. Thoughts?

azaghul

No problems at all doing mix-and-match with the PVDM's.

As for adding as you go, sounds like a good plan.

hermeszdata

I picked up 2 PVDM-12 DSPs from eBay for US$15.95 each SHIPPED!

I have 2 1760s that had PVDM-4s in them. I just put one in each router and off I went.

Genuine Cisco PVDM-12 DSP Module w/ 1-Year Warranty! - eBay (item 400112818218 end time May-01-10 12:06:54 PDT)

John

pitviper

hermeszdata wrote: »

I picked up 2 PVDM-12 DSPs from eBay for US$15.95 each SHIPPED!

I have 2 1760s that had PVDM-4s in them. I just put one in each router and off I went.

Genuine Cisco PVDM-12 DSP Module w/ 1-Year Warranty! - eBay (item 400112818218 end time May-01-10 12:06:54 PDT)

John

Those actually worked in the 1760s? I thought that the 1760s only accepted PVDM-256K-Xs?

Corndork2

They do. The NM-HDV supports PVDM-12's.

pitviper

The auction posted above is for pvdm-12s which will work fine in the NM-HDV but the 1760s require pvdm-256-xs.

mikej412

The docs DON'T say the PVDM-12s are supported..... but they work in my 1760s. I originally tried one from one of my NM-HDVs since the PVDM-12s were cheaper than anything else out there at the time.

pitviper

Good to know - the non-256ks are much much cheaper!!

Corndork2

Mike... Seriously? The PVDM-12's work in 1760-V's? I am trying this right when I get home. The price of one PVDM-256k-4 cost me slightly more than three of my PVDM-12's I have in an NM-HDV. The sad part about this entire thing is that the NM-HDV was just a good ebay catch. It was way to low priced to pass up... but Im not really sure how to utilize it yet. Oh well, time to study!

kikeperez_81

Hello, a question, Who has tested the PVDM-12 on the 1751 router?, Does it work?, I want to buy this router but am not sure that works, the seller says yes.

Cisco 1751-V 1751 router 64mb DRAM 32mb flash PVDM-12 - eBay (item 330430700547 end time Jul-04-10 12:36:09 PDT)

hermeszdata

kikeperez_81 wrote: »

Hello, a question, Who has tested the PVDM-12 on the 1751 router?, Does it work?, I want to buy this router but am not sure that works, the seller says yes.

Cisco 1751-V 1751 router 64mb DRAM 32mb flash PVDM-12 - eBay (item 330430700547 end time Jul-04-10 12:36:09 PDT)

I can't say about the 1751, BUT I have these in 2 1760s and they work fine!

John

kikeperez_81

thanks for your answer, someone has another comment.

kikeperez_81

hermeszdata wrote: »

I can't say about the 1751, BUT I have these in 2 1760s and they work fine!

John

What is the configuration of your router, IOS, memory?

hermeszdata

kikeperez_81 wrote: »

What is the configuration of your router, IOS, memory?

one has 128D 64F IOS Version 12.4(15)T11
the other is 96D 48F same IOS.

Both have dual PVDM 12 modules.

azaghul

I run multiple 1760's as branch offices;

B1 = 64M flash and 160M dram, E1, PVDM-256k-12
B2 = 64M flash and 160M dram, T1, PVDM-256k-8
B3 = 48M flash and 160M dram, T1, PVDM-256k-8

For CUCM as a "break-out" router 64M flash and 160M dram, PVDM-256k-20, 4FXS/DID, 4FXO

all running IOS c1700-adventerprisek9-mz.124-15.T13.bin

Corndork2

I lucked into some PVDM-256k-20's

So my two voice routers are:

1760 64MB Flash / 196MB DRAM 2x PVDM-256k-20

Both run CME 4.1 and 12.4T Advanced IP Voice IOS

alxx

Just got lucky. nm-hdv + 4x pvdm-12 for $41 + p&h(seeing if I can do local pickup)
eBay Australia: Buy new & used fashion, electronics & home d

alxx

There's certainly some good stuff going on ebay at the moment.
picked up another one
eBay Australia: Buy new & used fashion, electronics & home d