According to Hatice Babavatan:
>
> Hi guys....,
>
> So far I am having a term project going on regarding the above
> topic, unfortunately my references on the topic are very limited.
> I decided to join the this news_group after a long unsuccesful search,
> well.., still I have not got what I want ;
>
> So, I would be very happy if any one could acknowledge me of any
> available sources in the internet about the matter.
>
> Thankx
> I A. Rai
Our group is deploying ATM over satellite. COMSAT has several devices
that help with this, called ATM Link Enhancers (ALE) and ATM Link
Adaptors (ALA), that work at varios interface speeds. They perform
several functions, the most important ones being:
1) adaptive RS encoding - they use idle cells to carry reed solomom
codes and adapt to BER of circuit. They drop the CRC byte out of
the atm cell (53 bytes --> 52 bytes) for some bandwidth savings
too.
2) cell interleaving - to get around burst type errors associated with
satellite transmsions
3) header compression - have the ability to compress the 4 byte ATM header
into 2 bytes for applications where there is limited # of vci's.
4 bytes header + 48 byte payload + 1 byte CRC == 53 bytes normal ATM cell
2 bytes header + 48 byte payload + 0 byte CRC == 50 bytes in this scenario
4) large buffering - to help with long RTT
Contact COMSAT; they have several documents on both the ALA and ALE products.
--curtis
This archive was generated by hypermail 2b29 : Mon Feb 14 2000 - 16:14:33 EST