3Com 3C13886 Installation Guide - Page 29
DIP Switch, Table 2-9, Attribute, Description
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3Com Router Module Guide Chapter 2 Smart Interface Cards Table 2-9 Interface attributes of ROUTER 1-PORT FRACTIONAL E1 SIC Attribute Description Connector type DB15 Number of connectors 1 Interface standard G.703, G.704 Interface rate 2.048Mbps Cable type 75-ohm non-balanced coaxial cable (DB15 to BNC) 120-ohm balanced twisted-pair cable (DB15 to RJ-45) Coaxial connector, network interface connector and 75-ohm to 120-ohm adapter Operating mode E1 cE1, ISDN PRI (supported by SIC-EPRI only ) FE1(supported by ROUTER 1-PORT FRACTIONAL E1 SIC only) Supported service Backup Terminal access ISDN (supported by SIC-EPRI only) 2.4.4 DIP Switch E1/cE1/PRI interface is compatible with both 75-ohm impedance and 120-ohm impedance. The interface matches different types of impedance through an 8BIT DIP switch. By default, all the 8 positions of the DIP switch are ON, as shown in the following figure: 2-14