3Com 3C63311 Reference Guide - Page 135

Configuring the CBR Module 123 As shown in Figure 95, if you set the Port Mode to Structured Voice, you can set additional trunk conditioning (TC) parameters on the CBR Port Configuration menu. Figure 95 CBR E1 Port Configuration Menu (Structured Voice Mode) 4 Set the following port configuration parameters. LBO (T1-DSX only)-Line Build Out. LBO refers to the signal generation/regeneration of the distance between the PathBuilder S330/S310 and the next crossconnect of FOTs (Fiber Optic Terminal system), in feet: 1-100, 100-200, 200-300, 300-400, 400-500 or 500-600. Line Code (T1-DSX only)-The zero code suppression technique configured to the CBR T1-DSX port. Set this parameter to match the service provider or device connection line coding. The default is B8ZS. The Line Code must match at local and remote ports. AMI-Alternate mark inversion; a T1 (1.544 Mbps) carrier line coding format whereby successive ones (marks) are alternately inverted. B8ZS-Binary 8 Zero Substitution; a T1 (1.544Mbps) carrier line coding format used to accommodate "ones density" for clear channel transmission. The Line Code for CBR E1 ports is a read-only parameter and is always set to HDB3. Port Mode-The type of service configured to the specified port: Both Structured Data and Structured Voice modes allow end to end DS0 connectivity. For PRI (Primary Rate Interface) signaling, you must set the Port Mode to Structured Voice. Structured Data - Structured service provides N x 64 kbit/second capability, where N ranges between 1 and the maximum number of available DS0 channels. Structured data service passes traffic with signaling information disabled-it provides for DS0 midspan carrier access without A & B signaling bits terminating DS1 or E1 framing at the CBR T1-DSX or CBR E1 interface.