# 2 questions

Users Awaiting Email Confirmation Posts: 113
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

• CISSP, MCSA 2008, MCSA 2012, CCNA R&S, CCNA Security Ann Arbor, MIMember Posts: 1,854 ■■■■■■■■□□
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.
• Member Posts: 100 ■■■□□□□□□□
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
2019 Goals:
[ ] Recertify CCNA
• Member Posts: 897
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?
I don't claim to be an expert, but I sure would like to become one someday.

Quest for 11K pages read in 2011
Page Count total to date - 1283
• Member Posts: 294
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.
CCNP: ROUTE B][COLOR=#ff0000]x[/COLOR][/B , SWITCH B][COLOR=#ff0000]x[/COLOR][/B, TSHOOT [X ] Completed on 2/18/2014
• Users Awaiting Email Confirmation Posts: 113
I was actually looking at CCNA Voice and Security and maybe CCNP