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Introduction 215
SmartWare Software Configuration Guide 18 • ISDN Overview
Figure 33. Integration of ISDN access lines
Port activation deactivation—ISDN ports can be config-
ured while they are active. However they will be internally dis-
abled to modify the configuration and then re-enabled. All active
calls on the port are dropped during this process. Configuration
changes should only be performed during planned down times.
Reference clock source and synchronization—The
SmartNode uses a single reference clock source for the synchro-
nization of the 64kbit/s PCM channels on the ISDN ports and in
the CS context. This reference clock source can be internal or it
can be derived from one of the ISDN ports. If the clock reference
is not configured in accordance with the network environment,
clock slips and related voice quality degradations can occur.
Refer to chapter 31, “CS context overview” on page 339 on
how to configure the reference clock
S/T
S
UT
LE
Basic Rate Access point-to-multipoint (S-bus)
Basic
Rate
Access
Line
point
-
to
-
point
Primary Rate Access Line
PBX
Legend:
TE Terminal Equipment (Phone)
NT1 Network Termination 1 (Modem)
NT2 Network Termination 2 (PBX)
V
TE
NT1
Local Exchange
TE
LT ET
LT ET
TE
Phones
Phone
NT2 NT1
NT2
TE
Phone
U
ET
S
T
PBX
LE Local Exchange
LT Line Termination
ET Exchange Termination
T
Node
Node Node
IP Network
Node
S/T
IP Network
IP Network
IMPORTAN
T
IMPORTAN
T