[2176] in North American Network Operators' Group
Re: MCI [ATM overhead]
daemon@ATHENA.MIT.EDU (Paul Ferguson)
Wed Mar 20 15:33:20 1996
Date: Wed, 20 Mar 1996 15:08:18 -0500
To: Wolfgang Henke <wolfgang@whnet.com>
From: Paul Ferguson <pferguso@cisco.com>
Cc: johnc@msc.edu, nanog@merit.edu
At 08:38 AM 3/20/96 -0800, Wolfgang Henke wrote:
>
>Thank you for the reference. I will certainly check it out. Here is a
>little table which I hope will help ISPs planning to upgrade bandwidth:
>
>
>SONET (Synchronous Optical Network) speeds given in Mbps
>
> nominal w/o Sonet ATM TCP/IP
> overhead
>
>OC-3 STS-3c 155.520 149 122 137 future net backbone
>
>OC-12 STS-12c 622.080 599 488 549
>
>OC-48 STS-48c 2488.32 2396 1953 2197 current telco backbone
>
>OC-192 STS-192c 9953.28 9585 7813 8788
>
>on single mode fiber
>or multi mode fiber
>or CATV 75 ohm coax (the lower speeds)
>
And here's one that [fills in the gaps] shows the relationship between STS
and SDH:
SONET/SDH Heirarchies
SONET Bit Rate SDH
STS-1/OC-1 51.84 Mb -
STS-3/OC-3 155.52 Mb STM-1
STS-12/OC-12 622.08 Mb STM-4
STS-24/OC-24 1244.15 Mb -
STS-48/OC-48 2488.32 Mb STM-16
STS-192/OC-192 9953.28 Mb STM-64
- paul
