IBM 3745 Connection And Integration Manual page 52

Step
Unplugging or Plugging In an Ethernet LAN AUI Cable
Step
2-4
3745 All Models & 3746-900: CIG
4
Deactivating lines
If you are disconnecting any line (by removing a cable), ask the host
operator to deactivate all the lines to be unplugged.
Note: The line number is the same as the port number.
Then go to the following sections as needed:
"Unplugging or Plugging In an Ethernet LAN AUI Cable"
"Unplugging or Plugging In a Token-Ring Adapter (TRA) Cable" on
page 2-7
"Unplugging or Plugging In a High-Speed Scanner (HSS) Cable" on
page 2-8.
IMPORTANT
Install only AUI cables that conform to ISO 8802-3.
The ISO 8802-3 says:
"The connector is not specified to prevent operator contact with the shield,
precautions shall be taken at installation time to ensure that the installer is
warned that the shield is not brought into contact with any hazardous voltage
while being handled by operating personnel."
ATTENTION
To attach your controller to the Ethernet LAN, the SQE TEST switch on the
MAU must be set to ENABLE. If this is not done when you connect the AUI to
the 3745, operation of the Ethernet LAN may be interrupted.
1
Starting
Before beginning, you must first do the procedure "Getting Started" on
page 2-2.
There is a locking latch attached to the 3745 ELA connector. It is hard
to see as it is between the cable connector and the 3745. In this
procedure you may have to depend on feeling the latch with your
fingertips rather than seeing it. It is sometimes hard to move, you may
need to try more than once.
If you are only plugging in AUI cable(s), go to Step 3 on page 2-6.
Otherwise continue with the next step.
3745
Locking Latch