It allows switch processing cards to be shared by physical interface cards.
He could probably change out every interface card in the core in fifteen minutes.
Tor some reason, he kept a box of interface cards in his locker.
If it doesn't work then try reversing the cable on the interface card.
Most often these setup was used to control another Intel 58255 on the actual interface card.
The interface card for each computer is similar in structure although its shape may be different.
The heart of the technique is an interface card inserted into the computer which synchronises the different information sources.
And so each card, each interface card, is like that.
It was not implemented in Europe because the telephone system being different and the cost of developing another interface card.
Very high performance products have multiple processing elements on each interface card.