AW: [j-nsp] ATM Traffic Shaping on Juniper

[Struck, Olaf]

Hi,

the 26/27 term is used to calculate the payload bandwidth of the STS-3/AU-4
inside an OC-3/STM-1 signal. The SONET/SDH framing structure is usually
presented as matrix with 270 columns and 9 rows. Whereby 10 columns are used
by the signal overhead (line, section and path). So 260 of 270 columns are
left for the payload. For more details see ITU-G.707 or GR resp. ANSI
standard.  

Cheers,

Olaf

-----Ursprungliche Nachricht-----
Von: Tay Chee Yong [mailto:tcy@pacific.net.sg]
Gesendet: Mittwoch, 16. Oktober 2002 12:46
An: juniper-nsp@puck.nether.net
Betreff: [j-nsp] ATM Traffic Shaping on Juniper


Hi,

I had read through the section about specifying shaping values on the
Juniper
website, and understand that about the fomular to derive the line rate on
the
OC-3c interface using:

line-rate = 155,520,000 bps x (26/27) x (48/53) = 135,600,000 bps

However, I do not understand the (26/27) portion in the fomular. Would
appreciate if someone could help to clear my doubts. Thanks.

Regards,
Cheeyong


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