2 questions

impz · January 2011

1.)
In Odom's book he states that

DS0

64kbps
DS1(T1)

1.544Mbps (24 DS0 + 8kbps overhead)

So I was thinking, working backwards, 24 x 64 = 1536 + 8 = 1544kbps
Now to go from kbps to mbps, you usually divide by 1024
Therefore 1544/1024 = 1.5078125Mbps

I'm guessing that /1000 was used instead of /1024 to convert kbps to mbps but I wanted to make sure that it is indeed like that.

2.)
I'm looking to purchase a frame relay switch so I was wondering what was the best option out of these :

3640 with n/m 8as
2523
2620xm/2650xm with n/m 8as

alan2308 · January 2011

1. yes

2. Any router is as good as any other to perform Frame Relay switch duties as long as it has enough ports. Go with what ever you can get the best deal on, or go with whatever will be more useful for other things for when you're not working on Frame Relay.

chX · January 2011

For your first question, 1000 is correct.

1024 bytes is technically referred to as a Kibibyte. 1024 Kibibytes is a Mebibyte. 1024 Mebibytes is a Gibibyte, and so on.

See: Kibibyte - Wikipedia, the free encyclopedia

miller811 · January 2011

in my opionion if I was going to purchase a frame switch, I would purchase the cheapest thing possible.
Have you tried to simulate frame in GNS3?

johnwest43 · January 2011

i ended up using a 2611XM with a NM8as. Then i upgraded the flash and RAM and replaced the NM8as with a NM-2V for voice studies.

cheap is good but if you can reuse any of your ccna lab for other studies it might make sense to spend a little more now to save a little later.

impz · January 2011

I was actually looking at CCNA Voice and Security and maybe CCNP

2 questions

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