[Info-vax] terminal servers etc

[Phillip Helbig---undress to reply]

In article <50e9e0bb$1 at news.langstoeger.at>, peter at langstoeger.at (Peter
'EPLAN' LANGSTOeGER) writes: 

> In article <kcbd7q$7nh$1 at online.de>, helbig at astro.multiCLOTHESvax.de (Phillip Helbig---undress to reply) writes:
> >Yes, I have some BNC terminators.  Should one go just on the DEChub
> >(i.e. the backplane) or on the DECserver as well?
> 
> Only on the DEChub90 (The BNC - and the UTP - of the DECserver is unused if
> plugged into a DEChub90). You don't even have the space on the side for it.

OK, if it is in the hub, everything works through the hub, meaning the 
BNC connection on the hub goes to the outside world.  If not, then the 
BNC (terminate if not used) and UTP connectors to the outside world 
work.

I see that the DECserver (but not the DECrepeater) also has a power 
connection on the back, so can be run outside the hub.  The repeaters 
presumably don't need power, or get what they need through the 
backplane.

On another server and repeater (not in the hub and no connector for it), 
there is the same power connector, but an additional circular switch.  
What is the latter for?