4 Switch Interface Administration

Digital Interfaces

T1 for 4ESS Applications

The following options should be used when connecting a the system to a 4ESS switch via an E1/T1 line when using the E&M protocol.

Note: Some parameters on the switch side may require that you stop and restart the voice system once you have made changes. For example, when changing the frame format from D4ZCS to ESF, your PRI link to the switch may not come up if you have not stopped and started the voice system. See Stopping the Voice System on page 90 and Starting the Voice System on page 93 in Chapter 3, Voice System Administration , for the procedures.

T1 E&M Options

The following options should be set on the E1/T1 circuit card when it is connected to an AT&T 4ESS switch:

~Wink Timing: 230 msec

~Maximum Digits in Called Number: 4 is typical

~Post-wink Delay: 80 msec

E1/T1 E&M Fixed Parameters:

~Framing/Line Coding: D4/ZCS

Signaling: A or AB Robbed-bit E&M protocol

UCS 1000 R4.2 Administration 585-313-507

Issue 3 April 2000 188