ISDN Protocol Administrator's and Developer's Guide ... - Intervoice

D ChannelConfigurationTo configure the D channel, follow these steps:1 Enter 1 in the System Configuration screen.Pressing aftermaking a selection is notnecessary.2 Select the span to be configured by choosing a number from 1through 8.The Link Level Configuration screen for the D Channel is describedbelow:Intervoice recommendsnot changing any of thetimer defaults. Erraticsystem performance orsystem could result.For most configurations,Frame Level Addressshould be the only valuemodified on the Link LevelConfiguration screen.Span NumberDisplays the span number that was chosen at the SystemConfiguration screen. This number can be changed by scrollingthrough the spans with the or commands.Timer T200Starts upon sending a SABME command to start the Data LinkLayer. It is stopped upon the receipt of a valid UA command. If thistimer expires, another SABME will be sent, up to and including amaximum number of times as defined in the N200 retransmissionsparameter. The range is 1 to 120 seconds.Timer T203Represents the maximum time allowed in the multiple-frameestablished state without frames being exchanged. If the systemdoes not receive a valid layer 2 command for a period of T203seconds, the system sends a SABME command to restart Layer 2and start timer T200. If a valid Layer 2 command is received beforethe expiration of T203, the timer is reset. The range is 1 to 120seconds.14-6 ISDN Protocol Administrator’s and Developer’s Guide 60001262, First Edition