Re: (PM) PM-3 hardware design shortcut

Dick St.Peters (stpeters@NetHeaven.com)
Thu, 7 May 1998 11:58:41 -0400

> > The PM3 derives all the T1 clocking from line0. Today line0 failed
> > (open wire from the telco) and line1 also went down due to a loss of
> > clocking. After all the noise about NFAS and reliability (lose the
> > D-channel and lose both PRIs), the PM3 hardware design shortcut will
> > kill you just as dead.
>
> I realize this requires physical access to the PM-3, but pull both lines
> out, and switch line1 to the line0 port, and you have your PRI back.

There was a recent discussion about why anyone would ever by a 1-T
PM3; well, right here's the answer. I almost bought 2 1-T PM3s
instead of 1 2-T PM3 for a remote POP for this very reason.

In the end I gave in to the demands of my checkbook ... not due to the
small difference in cost for the base units but because one box
partially populated with modems can serve both Ts during rampup.
(One T is from a virtual POP.)

--
Dick St.Peters, stpeters@NetHeaven.com 
Gatekeeper, NetHeaven, Saratoga Springs, NY, 1-800-910-6671 (voice)
Saratoga/Albany/Amsterdam/BlueMountain/BoltonLanding/Cobleskill/
Greenwich/GlensFalls/LakePlacid/NorthCreek/Plattsburgh/...
	  First Internet service based in the 518 area code


-
To unsubscribe, email 'majordomo@livingston.com' with
'unsubscribe portmaster-users' in the body of the message.
Searchable list archive: <URL:http://www.livingston.com/Tech/archive/>