3com MSR 20-20 사용자 설명서
FIC-8E1/FIC-8E1-F
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Figure 206 Extending an E1 120-ohm balanced twisted-pair cable
Step 4: Power on the router, and check the behavior of the LINK LED on the card:
OFF means fault occurs on the line and the signal is not synchronized. Check the
line status.
OFF means fault occurs on the line and the signal is not synchronized. Check the
line status.
Connecting the interface cable of the FIC-4E1/FIC-4E1-F
Step 1: Select the 4E1/E1 cable appropriate to the type of the port on the
to-be-connected device, and correctly set the DIP switch.
to-be-connected device, and correctly set the DIP switch.
■
If the impedance of the to-be-connected port is 75-ohm, select E1 75-ohm
unbalanced coaxial and 75-ohm 4E1 adapter cables, and set all the BITs of the
DIP switch to the ON position (that is, the port impedance is 75-ohm).
unbalanced coaxial and 75-ohm 4E1 adapter cables, and set all the BITs of the
DIP switch to the ON position (that is, the port impedance is 75-ohm).
■
If the impedance of the to-be-connected port is 120-ohm, select E1 120-ohm
balanced twisted-pair and 120-ohm 4E1 adapter cables, and set all the BITs of
the DIP switch to the OFF position (that is, the port impedance is 120-ohm).
balanced twisted-pair and 120-ohm 4E1 adapter cables, and set all the BITs of
the DIP switch 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
to-be-connected port on the FIC-4E1/FIC-4E1-F and tighten the thumbscrews.
to-be-connected port on the FIC-4E1/FIC-4E1-F and tighten the thumbscrews.
Step 3: Identify the sequence number of the DB-15 connector at the other end of
the cable, and connect the connector to an E1 cable.
the cable, and connect the connector to an E1 cable.
Step 4: Connect the E1 cable to another device, by reference to the previous
subsection.
subsection.
Step 5: Power on the router, and check the behavior of the LINK LED on the card
panel: OFF means fault occurs on the line and the signal is not synchronized.
Check the line status.
panel: OFF means fault occurs on the line and the signal is not synchronized.
Check the line status.
FIC-8E1/FIC-8E1-F
Introduction
FIC-8E1
FIC-8E1, the 8-port channelized E1/PRI interface card, transmits, receives, and
processes eight channels of E1 data traffic. In addition, you can use the card for
other purposes, such as CE1 access and the ISDN PRI function.
processes eight channels of E1 data traffic. In addition, you can use the card for
other purposes, such as CE1 access and the ISDN PRI function.
FIC-8E1-F
FIC-8E1-F, the 8-port fractional E1 interface card, is different from the FIC-8E1
interface card in the sense that:
interface card in the sense that:
Router
Network
devices such
devices such
as DDN
DB-15
Network interface connector
RJ-45
RJ-45
120-ohm balanced twisted pair
120-ohm E1 trunk cable
Router
Network
devices such
devices such
as DDN
DB-15
Network interface connector
RJ-45
RJ-45
120-ohm balanced twisted pair
120-ohm E1 trunk cable