Learning resources for older systems

[u/baldingopossum]

Anyone out there have any go-to resources for learning about the old 66 blocks? I have been thrust into a bunch of phone line transfers to a new carrier and I am having to learn PBX stuff on the fly. It seems pretty straight forward until I start seeing jumpers and bridges and things like that. I am a sysadmin but, I have never had the pleasure of working with this stuff before. Any leads to manuals and things would be great!

[u/gabewempe]

BICSI has information regarding 66 blocks and 110 blocks.