Nortel Communication Server 1000S Installation And Configuration Manual page 95

Set up ISDN BRI trunking - Local Exchange connectivity
Figure 31 on page 96 illustrates a typical configuration to test ISDN BRI
Local Exchange connectivity. The ISDN BRI Local Exchange DSL is
connected to a Network Termination (NT1) device, which is physically
located on the same premises as the system. The NT1 device connects to the
Local Exchange that supports Numeris VN2, 1TR6 or D70 protocol through
a U interface. The distance limitation of the NT1 from the Local Exchange
depends on the distance supported by the Local Exchange.
To achieve system clock synchronization, configure the system as a slave to
the local exchange. Derive the clock source from either the ISDN BRI Local
Exchange connection or the other ISDN BRI/PRI/DTI local exchange
connections, if available.
After you complete the acceptance testing setup, proceed with the test
described in "Testing ISDN BRI functions" on
ISDN Basic Rate Interface
Preparing the system
page 99.
Installation and Configuration
Page 95 of 120