From: Darren Johnson (dazza_johnson@yahoo.co.uk)
Date: Thu Oct 04 2007 - 14:39:03 ART
Hello all. I want to get this nailed once and for all.
I have a serial line clocking at 128kbps. I configure
FRTS as follows:
CIR = 64000
Bc = 8000
Be = 8000
MinCIR = 32000
My understanding is this. I can send 8000 bits (Bc)
per Tc. Tc = CIR/Bc, so I can send 8000 bits every
125ms. On a serial interface clocking 128kbps, this
means that it will take only half of the Tc to send
the Bc (128000/8 = 16000 bits can be sent every
125ms).
So far so good. If I don't send any data for a full 1
second (all 8 Tc), then I can use these for Be over
the next Tc(s). The next second I transmit Bc (which
takes half the Tc) but I can also send Be (8000 bits)
becuase these were not used in previous Tc(s).
If I understand this right, if I send no data in 1
second, the next second I can send 16000 bits (Bc +
Be) for each Tc = 128kbps.
Additionally, the Be bits get the DE set to 1 by
default. Is this correct?
Hopefully someone can help confirm if I have nailed it
or not :-)
Dazzler
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