3Com 10BASE-2 (BNC Installation Manual page 3

To remove the faceplate:
1 Loosen the two captive screws securing the faceplate to the chassis.
2
Pull the faceplate away from the system.
LANplex 2500
R
You can replace a module while the system is powered on. Replacing the
Read if replacing
a module
module requires that you remove the attached cables from the module's
ports prior to installing the new module.
To replace a module:
1 Disconnect the cables from the module's ports.
2 Loosen the two captive screws securing the module to the chassis.
3 Pull the module out of the chassis.
The following figures show termination of unterminated BNC ports using
either a Y connector or a Feed-thru terminator.
R LANplex 2500
ERROR PCMCIA
Power Run Processor Power Fan Temp Config
Captive screw
ERROR PCMCIA
Power Run Processor Power Fan Temp Config
Green = Active
Port Status
Yellow = Error
Board
Error
Unterminated
Board
Error
1
Y terminator
BNC terminating plug
Inserted
Faceplate
Inserted
Active
Error
1 2 3 4 5 6 7 8
Port Status
Active
Error
2 3 4 5 6 7 8
Unterminated
10BASE-2 (BNC)
option module
Captive screw
Captive screw