NEC ELECTRA ELITE IPK II, Руководство по аппаратному обеспечению системы, Страница: 46 / 642

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3 - 12 System Specifications
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Document Revision 3 Electra Elite IPK II
Table 3-3 Maximum System Capacities for Trunk Interface ETUs
Trunk Interface
ETUs
Description
Maximum Capacities
Notes
Basic Port
Package
Expanded
Port Package
BRT(4)-U( ) ETU This 4-Port Basic Rate Interface for
eight trunks provides four channels
(eight voice channels) for an
ISDN-Basic Rate Interface. Caller ID
is supported. This ETU is installed in
slots S1~S4 in the basic or first
expansion B64-U20 KSU. The
maximum number depends on other
trunk ETUs installed. This ETU shares
the total number of CO/PBX lines in
the system. 7 23 Notes 1, 6
COI(4)-U( ) ETU This 4-Port CO/PBX Line Interface has
built-in fuses (posistors), supports four
outside (CO/PBX) lines, and provides
circuitry for ring detection, holding and
dialing. The outside lines must be Loop
Start DTMF trunks. This ETU is
installed in slots S1~S8 in the basic or
expansion B64-U20 KSU. The
maximum number depends on other
trunk ETUs installed. This ETU can
provide an E911 CAMA trunk.
This ETU shares the total number of
CO/PBX lines in the system. 14 23 Note 1
COI(8)-U( ) ETU This 8-Port CO/PBX Line Interface has
built-in fuses (posistors), supports
eight outside (CO/PBX) lines, and
provides circuitry for ring detection,
holding and dialing. The outside lines
must be Ground Start DTMF trunks.
This ETU is installed in slots S1~S8 in
the basic or expansion B64-U20 KSU.
The maximum number depends on
other trunk ETUs installed. This ETU
can provide an E911 CAMA trunk.
This ETU shares the total number of
CO/PBX lines in the system. 7 23 Note 1