Hardware manual

Electra Elite Issue 8
System Hardware Manual 5 - 25
4.2 BRT(4)-U20 ETU
4.2.1 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.
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 be used as trunks.
Figure 5-14 BRT(4)-U20 ETU