3Com 3C63311 Reference Guide - Page 138

126 CHAPTER 4: CONFIGURING PATHBUILDER S330/S310 MODULES, PORTS, AND APPLICATIONS CRC-4 (E1 only)-Enables (yes) or disables (no) Cyclic Redundancy Check 4 (CRC-4) information. CRC-4 is a framing option that checks for errors in data. It is a communication check for parity/framing and is used for performance monitoring in E1 networks. CRC4 can be enabled only in structured and multi-frame mode. Admin Status-Administrative status: Out of Service or In Service. 5 Select [10] Previous Menu to return to the CBR T1-DSX or CBR E1 Configuration Selection menu. 6 Repeat steps 3and 4 for the other CBR T1-DSX or CBR E1 ports you want to configure. DS0 Trunk Conditioning When the PathBuilder S330 is powered up, all DS0 channels on the T1 are trunk conditioned, six DS0s at a time. This trunk conditioning readies the PBX for voice communication. It is performed using TC1 signaling bits first and then TC2 signaling bits. The trunk conditioning stays in the each state (TC2 then TC3) for one second. The DS0s that are not assigned to a PBC stay trunk conditioned, forcing the PBX not to use them. If there is an alarm state or any error condition that will impact traffic, the affected DS0 channels are trunk conditioned using TC1 signaling bits first, and then TC 2 signaling bits. The trunk conditioning stays in the each state (TC1 then TC2) for one second. This trunk conditioning prevents calls from being placed over a bad line. Configuring the CBR To configure the CBR serial port, follow these steps: Serial Port 1 From the Configuration Management menu, select [1] Manage Card. 2 From the List Card menu, shown earlier in Figure 51, select [7] CBR. The CBR T1-DSX or CBR E1 Configuration Selection menu appears, as shown in above in Figure 93. 3 Select [4] Port 4 (V.35) to display the CBR T1-DSX/E1 V35 Configuration menu. Figure 97 shows the CBR E1 V35 Configuration menu. The CBR T1-DSX V.35 Configuration menu is the same.