3Com 3C13886 Installation Guide - Page 141
Interface Attributes, Panel and Interface LEDs, Table 4-17, Attribute, Description,
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3Com Router Module Guide Chapter 4 z In CT3 mode, providing the subscribers with N x 64 kbps or N x 56 kbps low-speed access, where N is smaller than or equal to 128. Note: T3 represents the tertiary group rate of T system in the TDM system, that is, 44.736 Mbps. Through T23 and T12A demultiplexing, a T3 channel can be channelized into 28 T1 lines, each also supporting the operating mode of CT1. T23 means either T2-to-T3 multiplex or T3-to-T2 demultiplex, and T12 means T1-to-T2 multiplex or T2-to-T1 demultiplex. "T23" and "T12" discussed here represent the demultiplex process. 4.7.2 Interface Attributes The following table describes the interface attributes of the ROUTER 1-PORT CT3 FIC. Table 4-17 ROUTER 1-PORT CT3 FIC interface attributes Attribute Description Connector SMB Number of connectors 2 Interface standard G.703, G.704, G.752 Interface rate 44.736 Mbps Cable T3 cable (75-ohm coaxial cable) Operating mode T3 CT3 Supported service T3 leased line 4.7.3 Panel and Interface LEDs The following figure illustrates an ROUTER 1-PORT CT3 FIC panel. Figure 4-32 ROUTER 1-PORT CT3 FIC panel 4-32