Subject: TG Descriptor CV (X'46') Subfield X'93' FRPVC

From: "jim (j.) cobban" <[email-masked]>
Date: Mon, 5 Feb 1996 16:44:00 -0500

In Subfield 46-93 for FRPVC it is specified that the DSAP is encoded in
*canonical* format, that is like Ethernet.  Similarly in subfield 46-95 the
SSAP is encoded in *canonical* format.  However in subfield 96 the DMAC is
specified in *noncanonical* format, because this is for BAN, which uses the
802.5 bridging format.

This seems inconsistent to me.  It is not clear to me from Rao Cherukuri's
document on Frame-Relay encapsulation that the SAPs of the LLC header used in
the original short encapsulation are expected to be encoded in canonical
format.  The comments indicate that the SAPs are expected to have the value
X'04', where canonical form would presumeably have X'20'.

We are not canonicalizing the SAPs before we transmit them on a FR PVC, and
we have not had any trouble talking to everyone else, so I assume that is
what everyone else is doing.

I therefore propose that in the descriptions of subfields 46-93 and 46-95,
that the FRPVC entries should be moved to join TR rather than ETHERNET.