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comment on ULE draft

To: ip-dvb@erg.abdn.ac.uk
Subject: comment on ULE draft
From: Tarif.Zein-Alabedeen@space.alcatel.fr
Date: Fri, 30 Jan 2004 16:34:14 +0100
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Reply-to: ip-dvb@erg.abdn.ac.uk
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This concerns §4.7.5 : bridged frame SNDU encapsulation ( fiugres 8 and 9)
:
The type field value in the figures is set to 0x0001. This indicates that
the payload is an ethernet frame with preserved FCS
This leads to a redundant CRC : that of the Ethernet frame and that of the
SNDU

In Eth/AAL5, it is useual to remove the FCS field from the Eth frame before
encapsulating it in AAL5 PDU since AAL5 makes its own checksum
This may also be a good thing for ULE.

The coding for the type field when the FCS is not preserved is 0x0007
(instead of 0x0001)

regards


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