Installation Manual
Quidway Eudemon 200 Firewall
Chapter 7 Interface Module
7-14
Caution:
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You must connect a cable to the interface with the appropriate mark. Misplugging is prone to impair the
interface module and even damage the interface module mainframe.
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When the interface cables of 4E1 are led to the outdoors, you are recommended to install a special
lightning arrester at the input end of the telephone line for the purpose of achieving a better lightning
protection effect.
Step 1:
Select the 4E1/E1 cable appropriate to the type of the port on the remote
device, and correctly set the DIP switches of the 4E1.
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If the impedance of the remote port is 75-ohm, select the E1 75-ohm unbalanced
coaxial cable and 75-ohm 4E1 adapter cable, and set all the DIP switches on 4E1
to the ON position (that is, the port impedance is 75-ohm).
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If the impedance of the remote port is 120-ohm, select the E1 120-ohm balanced
twisted-pair cable and 120-ohm 4E1 adapter cable, and set all the DIP switches on
4E1 to the OFF position (that is, the port impedance is 120-ohm).
Step 2:
Insert the DB-25 connector of the 4E1 adapter cable into the desired DB-25
port on 4E1 port and tighten the thumbscrews.
Step 3:
Determine the sequence number of the DB-15 connector at the other end of the
4E1 adapter cable, and connect the connector to the E1 cable.
Step 4:
Power on the Eudemon200, and check the status of the LINK LED on the
module panel. An OFF LED means that the line has failed and the signal has not been
synchronized. Check the line in this case.
7.7 4T1
7.7.1 Introduction
4T1 is 4-port channelized T1 interface module. The 4T1 module not only supports FT1
mode which can form only a bundle. In other words, the time slots can only be bundled
into one channel at the speed of nx64K or 56K, given n=1-24. But also a 4T1 module
supports channelized T1 (CT1) mode and PRI mode.
7.7.2 Interface Attributes
Table 7-10 describes the interface attributes of the 4T1.
