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Issue 6
5 - 26
4.4
COIB(4)-U20 ETU
4.4.1
Description
This ETU can function the same as the COI(4)-U( ) or
COID(4)-U( ) ETU to provide Central Office Interface.
Transmit and receive pad controls have been added to
the COIB(4)-U20 ETU. Ground Start trunks are not
supported. When the ETU is set for COID mode, Loop
Start trunks and Caller ID trunks are supported. Caller ID
does not work in the COI mode. Fax CO Branch support
is provided on the COIB(4)-U20 port 4 only.
This ETU contains circuitry for outside ring detection,
holding, dialing, and control functions.
This ETU can provide a CAMA trunk for E911.
CAMA trunk support is provided on COIB(4)-U20 port 3.
When functioning as a COI(4)-U( ) or COID(4)-U( ) ETU
only DTMF signaling is supported. Tip and Ring electrical
fuses are provided to comply with UL 1459 requirements.
Refer to
Figure 5-17 COIB(4)-U20
Figure 5-17 COIB(4)-U20 ETU
Installing Electronic Telephone Units
Electra Elite
ETU.
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