NEC ELECTRA ELITE IPK II, System Hardware Manual, Page: 181 / 642

Electra Elite IPK II Document Revision 3
System Hardware Manual 6 - 39
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5.6 COIB(8)-U20/U30 ETU
5.6.1 Description
These ETU functions are similar to the COI(8)-U( ) or COID(8)-U( )
ETU to provide Central Office Interface. Only the COIB(8)-U30 ETU
can support the CO Message Waiting Indication Feature. Transmit
and receive pad controls have been added to the COIB(8)-U20/U30
ETU. 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 a CAMA trunk for E911.
CAMA trunk support is provided on COIB(8)-U20/U30 ports 3 or 7
only.
Tip and Ring electrical fuses are provided to comply with UL 60950
requirements. Refer to
Figure 6-20 COIB(8)-U20/U30 ETU .
Figure 6-20 COIB(8)-U20/U30 ETU