receivers on a Quad-Receiver card.
4.
The generator is busied-out; maximum one. No further generator tests are
performed.
5.
No further tests on this slot are performed at this time. This error will occur if a
card is not installed for the programmed line or trunk
6.
No further test for supervisory tone presence are performed.
7. No further tests are performed.
8.
E021
will reappear if the system is reset. If E021 is not cleared by initializing the
MM
and reprogramming the system, replace the IPC card.