I - 22 ISDN-PRI Trunk Connections
Issue 6 Electra Elite
Elite 192 Restrictions:
Only Three PRT(1)-U10/20 ETUs can be installed in a system.
Up to 62 ISDN trunks (B channels) can be assigned in a system.
Note: This is accomplished by installing three PRT ETUs. The first two ETUs provide
23 B channels, and the third ETU provides 16 B channels (23+23+16 = 62).
The PRT(1)-U10/20 must be installed slots S1 and S4 in the Basic
B64-U10 KSU and slot S1 in the First expansion KSU.
Elite 48 Restrictions:
Only one PRT(1)-U10/20 ETUs can be installed in a system.
Sixteen ISDN trunks (B channels) can be assigned in a system.
The PRT(1)-U10/20 must be installed in slot S4 in the B48-U10 KSU.
General:
When using CO or DID Services without Call by Call, Memory Block
1-1-81 (ISDN Dial Interval Time Selection) specifies the time
between each digit dialed before digits are sent over the Network.
Memory Block 1-1-80 (ISDN DTMF Duration/Interdigit Selection) is
effective after answer supervision is received from the CO.
When an ISDN line layer 1 or layer 2 down condition occurs, the CO
line key red LED is On, and the following error message is displayed
on the first line of the LCD of Multiline Terminals connected to port 1:
Layer 1 Down: COxx Layer1 DOWN
Layer 2 Down: COxx Layer2 DOWN
xx is the CO Trunk Number (01~64)
Layer 1 has a higher priority than Layer 2.
This display disappears automatically when the error is
recovered.
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