Liaison statement
ASON lexicography

Submission date 2005-11-25
From ITU-T SG 15 (Greg Jones)
To IETF CCAMP WG (kireeti@juniper.net)
Cc sob@harvard.edu
Response contact tsbsg15@itu.int
Technical contact hklam@lucent.com
Purpose For comment
Deadline 2006-01-27 Action Taken
Attachments ASON lexicography
Body
Q.12/15 thanks the CCAMP working group for the liaison of the Internet-Draft,
we look forward to continuing the dialog on the development of this document. 
In response to the questions that you raised:
The experts of Q.12/15 reviewed the current version of the draft to ensure
that the ASON description of the GMPLS terms are accurate.  We used the
informal definitions of the GMPLS terms provided in the draft, supplemented by
some clarifications provided by Mr. Adrian Farrel at the meeting, as the basis
for our review.  We have the following suggestions to resolve the points that
were raised in the liaison:
Item 1:
CCAMP proposes the following text:
"ITU-T [should be ASON] terms for resource:
	Connection point (cp) in the context of link discovery and resource
management (allocation, binding into cross-connects, etc.);
	Link connection or trail termination in the context of  routing, path
computation and signaling."
We suggest the following revision to the text:
"ASON terms for resource:
	In the context of link discovery and resource management (allocation, 
binding into cross-connects, etc.) a GMPLS resource is one end of a link
connection,
	In the context of routing, path computation and signaling, a GMPLS
resource is a link connection or trail termination." 

Item 2a:
Note that ASON does use the concept of a link end in the form of a subnetwork
point pool (SNPP).
CCAMP proposes the following text:
"In ASON, a GMPLS unidirectional data link end is a collection of connection
points from the same client layer that are supported by a single trail
termination (access point)."
We suggest the following addition to clarify the relationship between ASON
SNPP and GMPLS data link end:
"A GMPLS unidirectional data link end is a collection of connection points
from the same client layer that are supported by a single trail termination
(access point).  This is a constrained form of an SNPP."

Item 2b:
The relationship between ASON links and their supporting server trail(s) was
discussed with Mr. Adrian Farrel to clarify the ASON model.

Item 3:
After discussing CCAMP’s concern we suggest the following modified text that
captures the notion that the interface is between a server layer trail and a
client layer subnetwork without constraining the server layer to be a physical
layer.
"A GMPLS interface is the set of trail termination and adaptation functions
between one or more server layer trails and a specific client layer subnetwork
(which commonly is a matrix in a network element)."