IBM 3745 Connection And Integration Manual page 29

Figure 1-4. 3745 Models 21A to 61A: Service Connectors
Unplugging or Plugging In an Ethernet LAN AUI Cable
Step
LAN Connection
for Service
Processor
Customer Power
Control (CPC)
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 communication 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 1-2.
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.
Chapter 1. 3745 Models 210 to 61A: Connecting LICs and Cables
J1
J3
1-7