3com MSR 20-20 사용자 설명서
186
C
HAPTER
4: F
LEXIBLE
I
NTERFACE
C
ARDS
Interface Cable
The interface that the FIC-1AE3 provides uses two SMB sockets for data
transmitting and receiving respectively. The ports adopt the 75-ohm unbalanced
transmission mode and are connected to the peer device using a pair of 75-ohm
unbalanced coaxial cables. Several cable length options are available.
transmitting and receiving respectively. The ports adopt the 75-ohm unbalanced
transmission mode and are connected to the peer device using a pair of 75-ohm
unbalanced coaxial cables. Several cable length options are available.
Figure 228 E3/T3 cable
n
The FIC-1AE3 and the FIC-1AT3 use the same type of cables for connection, which
are called E3/T3 cables in this manual.
are called E3/T3 cables in this manual.
Connecting the Interface
Cable
c
CAUTION: By design, the FIC-1AE3 is protected against lightning strikes. But
when outdoor cabling is involved, you are recommended to add a special lightning
arrester at the input end of the E3/T3 cable for better protection.
when outdoor cabling is involved, you are recommended to add a special lightning
arrester at the input end of the E3/T3 cable for better protection.
Step 1: Connect the SMB connector of an E3/T3 cable to the Tx port on the
FIC-1AE3 and another end to the Rx port on another device.
FIC-1AE3 and another end to the Rx port on another device.
Step 2: Connect the SMB connector of another E3/T3 cable to the Rx port on the
FIC-1AE3 and another end to the Tx port on another device.
FIC-1AE3 and another end to the Tx port on another device.
Step 3: Check the behavior of the LINK LED on the FIC-1AE3 panel: OFF means
fault occurs on the line and the signal is out of synchronization. Check the line
status.
fault occurs on the line and the signal is out of synchronization. Check the line
status.
FIC-1AT3
Introduction
FIC-1AT3, the 1-port 44 Mbps ATM-T3 interface card, provides these functions:
■
Two ATM cell mapping modes: ADM and PLCP.
■
Scrambling in data transmission.
■
Line clock (when working as DTE interface) and internal clock (when working
as DCE interface).
as DCE interface).
Table 130 LEDs on the FIC-1AE3 panel
LED Description
LINK
OFF means no link is present; ON
means a link is present.
means a link is present.
ACT
OFF means no data is being
transmitted or received; blinking
means data is being received or/and
transmitted.
transmitted or received; blinking
means data is being received or/and
transmitted.
BNC connector
SMB connector
BNC connector
SMB connector
BNC connector
SMB connector
BNC connector
SMB connector
BNC connector
SMB connector