RE: question about MPE and AAL5 over satellites

["Clawson, Michael" <mclawson@loralskynet.com>]

The premise of your question seems to be that MPE and/or AAL5 limit payloads
to 1500 bytes.  They don't; Ethernet does.

-----Original Message-----
From: De Schepper Raf [mailto:raf.deschepper@vtk.be]
Sent: Monday, May 12, 2003 10:46 AM
To: ip-dvb@erg.abdn.ac.uk
Subject: question about MPE and AAL5 over satellites


Hello,
 
I am an engineering student, currently working on my thesis in cooperation
with Alcatel about security on the ethernet layer in satellite networks. The
network I have considered in my work uses PPPoE encapsulated by MPE in MPEG
transport streams for the forward link and encapsulated by AAL5 in ATM for
the return link. If you insert security fields, the possibility exists that
the payload of the ethernet frame becomes larger than the allowed 1500
bytes. My question is now whether it is possible to modify MPE and AAL5 to
allow frames with payloads larger than 1500 bytes to be inserted?
 
It would help me a lot if someone could answer this question for me since I
studied the MPE and AAL5 standard and did not find an exact answer for this
question.
 
Thanks in advance,
 
Raf De Schepper
Department of electronics engineering - ESAT
KU Leuven
Belgium