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DEFINITY ECS Release 8.2 ATM Installation,
Upgrades, and Administration
555-233-124
Issue 1
April 2000
Installing a DEFINITY ECS ATM-PNC
3-4Synchronization Installation and Testing
3
Connections without synchronization splitters
In some configurations the ATM switches are traced to network clocks through
their SONET/SDH interfaces, not requiring any synchronization splitters.
However, the ATM switch could require a single splitter if only one of the sync
sources is derived from the network.
The ATM switches may obtain their network synchronization as follows:
■ The ATM switch gets its network timing reference from its
SONET/SDH/SDIT interface to that network.
■ Or if the customer wants to use a DS1 source for network synchronization
that also happens to be a DEFINITY ECS switch trunk, then one sync
splitter is necessary to send a copy of that DS1 signal to the ATM switch.
The DS1 circuit pack is only an indirect timing reference for the DEFINITY
ECS switch.
Connections needing synchronization splitters
If the ATM network does not provide a synchronization expander (splitter), then
the ATM configurations may require one that takes a DS1 T1 or E1 signal and
redirects it to the
■ ATM switch(es), depending on configuration and duplication
■ DEFINITY ECS through the DS1 circuit pack
This creates a single synchronization source.
Check the customer’s configuration carefully so that you can
■ Connect the hardware correctly during installation
■ Properly administer the synchronization plan later (
Chapter 5,
‘‘Administering ATM-PNC and ATM-CES’’)
This section covers the synchronization installation and test process.
■ Splitter descriptions—Describes the splitter’s inputs and outputs
■ Synchronization splitter connections—Connection diagrams for timing
connections through a DSU/CSU (
Figure 3-6
) and an ICSU (
Figure 3-7
)
■ Verify the DS1 service—Checks for presence of the DS1 T1 or E1 timing
source and the general health of the DS1 circuit pack.
■ Installing and testing the splitter provides the following information
—
Splitter port tests (401A/401A only)
—
Installing a 400A T1 splitter
—
Installing 401A, 402A, or 403A splitters