[c-nsp] 7206 VXR size question

[Justin M. Streiner]

On Wed, 20 Sep 2006, Eric Helm wrote:

> How many ATM Port Adapters (PA-A3-OC3SMI) are supported on a single 7206
> VXR NPE-400 with 512MB DRAM? I need to put 3 of them in the box.
> This will terminate 1500 DSL Internet subscribers, 90% are 256kbps, so
> PPS or Mbps should not be an issue.

If I remember correctly, the PA-A3-OC3xxx uses 300 bandwidth points, so 
you would be able to put a maximum of four in a 7200VXR chassis, assuming
1. you put two PA-A3s on each PCI bus - slots 0, 1, 3, and 5 are on one 
bus, and slots 2, 4, and 6 are on the other bus.
2. you're using an NPE with built-in fast-e or gig-e ports like an NPE-G1 
or NPE-G2, and
3. There is no fast-e port on your I/O controller, or you don't have an 
I/O installed, which is not necessary with an NPE-Gx.

In your situation, you could put a max of probably 3 PA-P3-OC3s in your 
chassis.  I say probably because it depends on what you're using as an 
uplink/aggregation interface on your I/O controller.  If it's fast-e you 
can get 3 in the box.  If it's gig-e, you'll only have enough bandwidth 
points for two on the other bus.

I think each PA-A3-OC3 will support up to 4096 VCs and newer IOS releases 
(12.3 and newer) will support up to 20,000 IDBs per box.  You may exhaust 
other resources such as CPU and memory before you exhause your VCs or 
IDBs.

jms