[nsp] ONS15454 vs 12000 for the OC-3 demuxing

[Matthew Crocker]

The ONS 15454 is not a router, it is a SONET ADM and can mux/demux at  
DS-1 through OC-192 levels.  It doesn't handle any routing.   It is  
also a digital cross connect providing DS-1 (VT1.5s) DS-3 and STS-n  
cross connects.  You *can* get the MC series switch card which handles  
routing (think 3550 series stuffed inside the SONET ring) but the 15454  
can't terminate DS-1s to packet natively.

If you are look at a pure cost stand point and you want to terminate at  
most 3 OC-3s worth of DS-1 traffic you can look at using an Adtran  
OPTI-3   OC-3 <-> DS-3 mux to break the OC-3 from qwest into 3  
Channelized DS-3s.  You can then connect the DS-3s to 3 PA-MC-2T3 cards  
running on VIP4-50s in your 7500 series router.

To terminate 2 OC-3s on a 7500 series router you would need

2 Adtran OPTI-3 muxes    $5k each
3 PA-MC-2T3                     $28k each (list)
2 VIP4-50s                         $11k each (list)

Total  $116k,   $690 per DS-1  (list)

Alternatively you could get a Seranoa IPeX (www.seranoa.com)  a GEIP+  
card for. With this setup, each DS-1 appears on the GigE card as a VLAN  
ID

To terminate 2 OC-3s on a Seranoa and then into a 7500 Gig E port you  
would need

2 Adtran OPTI-3 muxes  $5k each
1 Seranoa IPeX 200 (12 channelized DS-3s)   $60k  (list)
1 GEIP+    $11k (list)

Total  6 DS-3s $81k,  $482 per DS-1 (list)
Total 12 DS-3s $91k,  $270 per DS-1 (list)

The good thing about the Seranoa solution is it scales to 12 DS-3s and  
if you outgrow the PPS of the 7500 you can replace it with a 7600 GigE  
port or a M7i.  It separates your interface termination from your  
packet forwarding engine.  You can easily have several routers, even  
fail over routers handle your DS-1 customers by switching the VLANs to  
different router ports.  With PA-MC-2T3 you are stuck with the  
7500/7200 series or the unstable/expensive WAN cards for the 7600  
series



On Jul 13, 2004, at 6:46 PM, Mike Lewinski wrote:

> So after having done a bunch of research and having learned quite a  
> bit about Sonet vs. SDH, PoS, ATM etc. and realizing the constraints  
> of the product we're buying, it seems like if we stay Cisco our two  
> most logical choices are the ONS 15454 or a 12000 series.
>
> Right now I'm leaning toward the 12000 mainly because it's a real  
> router whereas the ONS 15454 seems like more of an ADM (albeit a fancy  
> one that's not limited to a given transport) that's going to leave me  
> still needing router interfaces to handle circuits I break down with  
> it.
>
> It certainly looks like this:
>
> CISCO 12000 SERIES 2-PORT CHANNELIZED OC-3/STM-1 (DS1/E1) LINE CARD
> http://www.cisco.com/en/US/customer/products/hw/modules/ps2710/ps189/ 
> index.html
>
> ...does exactly what I need. No PoS or ATM on this product, just  
> allows me to peel of DS1s and supports "1310 nm single-mode (SM)". I  
> can't tell if it's got SC or FC connectors, but I'm starting to  
> suspect this is a non-issue (I've found at least two sources of  
> convertors, Qwest says they are going to give me FC but most of the  
> Cisco stuff I've seen has SC- since I have to have my demarc extended  
> I'm assuming I can have my wiring contractors just terminate each end  
> appropriately?)
>
> Anyone using the 12000 channelized OC-3 line card who can verify my  
> belief that this is going to do the trick for us? Or any arguments for  
> the ONS 15454, given that at most we will have two OC-3s at this  
> particular site and nothing else for the foreseeable future since we  
> are pushing most of our expansion circuits into a different POP not  
> yet fed by an ICDF colo?)
>
> Thanks for all the responses! I received a couple privately that also  
> indicated I was SOL for the 75xx/72xx channelized OC-3 options (we do  
> have some PA-MC-T3s in service on 75xx and they work great btw :)
>
> Mike
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