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RE: DS-3 card [7:98158] posted 04/01/2005
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This might help:

http://sd.wareonearth.com/~phil/net/overhead/




Quoting "Bill Creighton (wcreight)" :

> The 3745 is the strongest box that the DS3 card is available for
> 
> The 2600 Will support the card per released documentation (URL below)
> (with min. 12.1(2)T Plus and 48Mb DRAM)
> 
> The 3845, as a new platform, has not been fully tested with the DS3
> interface, it will be supported soon.
> 
> As for DS3 line rate vs. Ethernet - Priscilla, please back me up, but
> there is significant overhead (headers, encapsulation, etc.) associated
> with a TDM/serial link as opposed to Ethernet - that is why comparing
> bandwidth on those types of interfaces is like apples and oranges...
> 
> http://www.cisco.com/en/US/products/hw/routers/ps274/products_data_sheet
> 09186a0080091b9e.html
> 
> HTH
> 
> Bill Creighton
> 
> > -----Original Message-----
> > From: nobody@xxxxxxxxxxxxxx [mailto:nobody@xxxxxxxxxxxxxx] On 
> > Behalf Of Duncan Maccubbin
> > Sent: Friday, April 01, 2005 11:03 AM
> > To: cisco@xxxxxxxxxxxxxx
> > Subject: Re: DS-3 card [7:98158]
> > 
> > Hmm, this is from Cisco's site:
> > 
> > The Cisco T3/E3 Network Module provides the high-speed 
> > performance required to build today's advanced, fully 
> > converged networks that need to support a wide array of 
> > applications and services such as security, and advanced 
> > quality of service (QoS) for voice and video. T3/E3 and 
> > subrate T3/E3 connectivity allows customers to take the 
> > fullest advantage of their WAN bandwidth for deploying the 
> > newest applications and service delivery. The Cisco 3745, for 
> > instance, is the highest-performing platform and is 
> > recommended for concurrent application environments where 
> > full wire rate is required. The Cisco 3725 and Cisco 3660 are 
> > the next highest-level performers; they have very similar CPU 
> > loading characteristics under comparable traffic conditions
> > 
> > 
> > 
> > 
> > -----Original Message-----
> > From: John Neiberger
> > Sent: Apr 1, 2005 7:58 AM
> > To: cisco@xxxxxxxxxxxxxx
> > Subject: Re: DS-3 card [7:98158]
> > 
> > > One of our long time Cisco techs we have on the contract 
> > says it can 
> > >be done if you use a lot of memory.
> > 
> > One other thing... Memory is not the issue. The problem is 
> > processing power.
> > Smaller routers like the 2600XM series simply don't have 
> > enough horsepower to handle these cards. In order to handle a 
> > full-rate DS3 you need a 3660 or
> > 3845 router or bigger. Even a 3825 can't do full-rate DS3. It 
> > takes quite a bit of processing, which does seem a little 
> > strange. Why do these routers have such a hard time with 45 
> > Mbps speeds when many of them can support two Fast Ethernet ports?
> > 
> > Even stranger, the 3825 can support two Gigabit Ethernet 
> > ports yet it can't run full-rate DS3. What the heck? It makes 
> > no sense, but that's what the Cisco documentation says.
> > 
> > HTH,
> > John




Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=98176&t=98158
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