NEC ELECTRA ELITE IPK II, System Hardware Manual, Page: 174 / 642

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6 - 32 Installing ETUs (Circuit Cards)
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Document Revision 3 Electra Elite IPK II
5.4 COIB(4)-U(10) ETU
5.4.1 Description
This ETU can function the same as the COI(4)-U( ) ETU or
COID(4)-U( ) ETU to provide a Central Office interface. When the
ETU is set for COID mode, Loop Start trunks and /or Caller ID trunks
are supported. When the ETU is set for COI mode, Loop Start or
Ground Start is supported. Caller ID is not supported in COI mode.
Connections for Ground Start trunks are polarity sensitive.
Fax CO Branch Support is provided on Port 4 only.
Only DTMF signaling is supported.
This ETU can provide an E911 CAMA trunk.
Tip and Ring electrical fuses are provided to comply with UL 1459
requirements.
Figure 6-16 COIB(4)-U(10) ETU