> Does any one out there have any info on SP-1 central office switches. I am
> doing a study on the Canadian Telecommunication System and have
> encountered deployment of these switches in most Canadian provinces.
> The Telecom Digest is currently mostly robomoderated. Please mail
I believe the SP-1 was a computer driven mini crossbar switch from Northern
Electric. This would make it a lot like the 1ESS, except for the crossbar
instead of reed switches. Northern lost the rights to build Western
Electric designs after the #5 Crossbar. I think SP-1 was their first big
The computer went on to become the first core processor for the DMS-100
series, which came out of the same division of BNR and succeeded the SP-1.
The early, at least, DMS-100s kept the mini crossbar for electrical test
access. They were mounted on the back of the line module.
The Telecom Digest is currently mostly robomoderated. Please mail