As far as I could work from what BT's techie was saying it is a remote peripheral shelf. The peripheral shelf would connect to the 81C via a few megastreams, providing 27 phones per megastream, almost like long line extentions.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.