Hardware manual

Electra Elite Issue 8
System Hardware Manual 5 - 21
SECTION 4
T
RUNK ETUS The Electronic Telephone Units described in this section provides a link
between trunks in the Electra Elite 192 system and outside equipment. All
ETUs are installed in the interface slots of the KSU.
4.1 BRT(4)-U10 ETU
4.1.1 Description
The Basic Rate Trunk (BRT) Interface ETU terminates
ISDN Basic Rate Trunk lines and supports four ISDN-BRI
circuits. Each trunk supports two B channels. These
eight B channels can be used for CO trunks with DTMF
signaling. Tip and Ring electrical fuses are provided to
comply with UL 1459 requirements.
This ETU uses an S/T-type interface. When connecting to
a CO, a locally provided Network Termination unit (NT1)
is required. Caller ID is supported.
One BRT ETU provides a maximum of four ISDN circuits
that provide eight B channels to use as trunks.
Figure 5-12 BRT(4)-U10 ETU