Re: Purpose of terminology I-D

[IZUMIYAMA Hidetaka <izu@jcsat.co.jp>]

Scott,

From: Scott Michel <scottm@rush.aero.org>
Subject: Purpose of terminology I-D
Date: Tue, 22 Jul 1997 13:22:00 -0700 (PDT)

> I may have been a little more caustic than usual when I replied to
> IZUMIYAMA Hidetaka's reposonses. However, his reply was pretty
> opaque wrt what it was he wanted, other than a redefinition of the
> terminology.

Sorry for my few word.
I try to say the more clear in this mail.

Fig-1 is a figure from your udlr-terminology I-D.
			     ___   ___
			     \__\OO\__\	 Satellite
			      ^^    vv	  Network
			      /	      \
		      feed   /	       \
			    /		\
			   /		 \
	       uplink	  /		  \
		    ---- /		   V ----
	  ---======>|  |		     |	|  downlink(s)
		    ----		     ----
		     /\			      /\
		     ||			      ||
		     \/			      ||
		   -------------------------  ||
		   |	   Reachback	   |<==/
		   -------------------------

			    Fig-1 

		%%%			%%%

Fig-2 is my idea.
			     ___   ___
			     \__\OO\__\	 Satellite
			      ^^    vv	 
			      /	      \
		    uplink   /	       \ downlink
			    /		\
			   /		 \
	                  /     	  \
		    ---- /		   V --------
	           |Feed|		    |Receiver|  
		    ----		     --------	
                     /\			      /\
		     ||			      ||
		     \/			      ||
		   -------------------------  ||
		   |	 Internet          |<==/
		   -------------------------

			    Fig-2

		%%%			%%%

(1)Term for a host or a router which handle UDL.

  The terminology of satellite communications are shown in the Radio 
  Regulations agreed upon at meeting of the WARC, ITU.
  In this document, the transmission path from earth station to 
  satellite(space station) is refered to as "up-link". Another 
  direction, from satellite to ground station is refered to as 
  "down-link".

  So, I think "Feed" and "Receiver" are better than "up-link"
  and "down-link" for this purpose.

(2)Term for the UDL path

  I use "Forward-channel" for the path from "Feed"
  (sender of UDL) to "Receiver"(receiver of UDL) via UDL.

  I also use "Back-channel" for the path from "Receiver"
  to "Feed" via BDL .

  My understanding is your "reachback" is the term for a network
  which provides connectivity from "Feed" and "Receiver".So
  "Back-channel" is not a synonym of "reachback".

  I hope you will add "Forward-channel" and "Back-chaneel" for
  UDLR terminology.

(3)Term for Network Interface

  The term "VIF (Virtual Interface)" is only use for
  our UDLR solution. If you want to define the general term for
  UDLR, I think "VIF" is not needed.

  I will define "VIF" in my document.

-- izu --