Coib(4)-U20 Etu; Description - NEC Electra Elite IPK II System Hardware Manual

Electra Elite IPK II
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5.5
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System Hardware Manual

COIB(4)-U20 ETU

5.5.1

Description

These ETUs functions are similar to the COI(4)-U( ) or COID(4)-U( )
ETU to provide a Central Office interface. Only the COIB(4)-U30 can
support the CO Message Waiting Indication feature. These ETUs
have transmit and receive pad controls. When the ETU is set for
COID mode, Loop Start trunks and Caller ID trunks are supported.
When the ETU is set for COI mode, Loop Start is supported.
Ground Start Trunks are not supported. Caller ID is not supported in
COI mode. Fax CO Branch support is provided on port 4 only.
Only DTMF signaling is supported.
This ETU can provide an E911 CAMA trunk on port 3 only.
Tip and RIng electrical fuses are provided to comply with UL 60950
requirements.
Figure 6-18 COIB(4)-U20/U30 ETU
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