Hardware manual

Issue 8 Electra Elite
1 - 8 Introduction
COIB(4)-U20/U30
ETU
This ETU can function the same as the COI(4)-U( )
or COID(4)-U( ) ETU to provide Central Office
interface. Only the COIB(4)-U30 can support the
CO Message Waiting Indication feature (S9500).
This ETU has transmit and receive pad controls.
When 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.
For COI mode: ETUs can be installed in any IF
slot.
For COID mode: Caller ID trunks must be installed
in slots S1~S4 in basic or first expansion KSU
(S7000 or lower). S8000 or higher has no slot
limitations.
The maximum number depends on other Trunk
cards installed.
This ETU shares the total number of CO/PBX lines
in the system.
Tip and RIng electrical fuses are provided to
comply with UL 1459 requirements.
COI Mode
16 ETUs
COID Mode
8 ETUs
Equipment Name Description Basic KSU
Basic + 1
Expansion
KSU
Basic + 2
Expansion
KSUs