NEC Electra Elite 48/192 Features And Specifications Manual page 405

Issue 6
I - 22
Elite 192 Restrictions:
Only Three PRT(1)-U10/20 ETUs can be installed in a system.
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Up to 62 ISDN trunks (B channels) can be assigned in a system.
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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
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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.
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Sixteen ISDN trunks (B channels) can be assigned in a system.
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The PRT(1)-U10/20 must be installed in slot S4 in the B48-U10 KSU.
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General:
When using CO or DID Services without Call by Call, Memory Block
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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
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effective after answer supervision is received from the CO.
When an ISDN line layer 1 or layer 2 down condition occurs, the CO
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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.
Electra Elite
ISDN-PRI Trunk Connections