Lucent Technologies Comcode 108678723 manual Connections without synchronization splitters

DEFINITY ECS Release 8.2 ATM Installation,	Issue 1
Upgrades, and Administration 555-233-124	April 2000
3 Installing a DEFINITY ECS ATM-PNC
Synchronization Installation and Testing	3-4

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—Connectiondiagrams 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