172 CHAPTER 4: F LEXIBLE INTERFACE CARDSConnecting the InterfaceCablec CAUTION: Before you connect a port, read its label carefully; a wrong connectionmay impair the interface card and even damage the device.You are recommended to install a special lightning arrester at the input end of theinterface cable for better lightning protection.Step 1: Choose an 8E1 conversion cable appropriate to the interface type of thedevice to be connected.■ If the interface impedance of the device is 75-ohm, use a 75-ohm 8E1conversion cable.■ If the interface impedance of the device is 120-ohm, use a 120-ohm 8E1conversion cable.Step 2: Insert the DB-68 connector of the cable to the DB-68 port on theFIC-8E1/FIC-8E1-F card, and fasten the cable fastening screws.Step 3: Identify the sequence number of the other end of the 8E1/4E1 conversioncable and connect it with a peer device.Step 4: Power on the router. Check the behavior of the LINK LED on the cardpanel: OFF means fault has occurred on the line and signal is out ofsynchronization. Check the line status.FIC-1T1/FIC-2T1/FIC-4T1 andFIC-1T1-F/FIC-2T1-F/FIC-4T1-FIntroduction FIC-1T1/FIC-2T1/FIC-4T1FIC-1T1/FIC-2T1/FIC-4T1, the 1-/2-/4-port channelized T1/PRI interface card,transmits, receives, and processes T1 data traffic. In addition, you can use the cardfor other purposes, such as CT1 access and the ISDN PRI function.FIC-1T1-F/FIC-2T1-F/FIC-4T1-FFIC-1T1-F/FIC-2T1-F/FIC-4T1-F, the 1-/2-4-port fractional T1 interface card, differsfrom the FIC-1T1/FIC-2T1/FIC-4T1 primarily in the sense that:■ The FT1 operating mode supported by the T1-F cards allows only one n × 64kbps or n × 56 kbps bundle to be formed on each interface, where n = 1 to 24.However, a T1 card allows arbitrary grouping of 24 channels and multiplebundles.■ The FIC-T1-F cards do not support PRI mode.Interface Attributes The following table describes the interface attributes of the FIC-T1/FIC-T1-F cards.
