IBM 3746-900, Installation And Maintenance Manual

Page: 49 / 264

modem side. If this modem is not being installed in the United Kingdom,
connect the other end of the cable to the telecommunication line.
Step 4. Connect the modem power plug to a standard 3-pin grounded ac outlet.
If this modem is being installed in the United Kingdom, connect the
telecommunication cables you have attached to the modem, to the
telecommunication lines.
Step 5. Observe the modem power-on sequence.
This is the normal power-on sequence:
PWR light is turned on.
The HW SELFTEST RUNNING message is displayed for about 15
seconds.
The DSP SELFTEST RUNNING message is displayed for about 15
seconds.
Set the modem power switch to ON. If the PWR light is not on, or the
message
HW SELFTEST RUNNING is not appearing on the operator panel
within 10 seconds, the modem is defective and should be replaced. This
message remains on the display for about 15 seconds, then it is changed
by the power-on sequence.
If the modem is set to the factory defaults, after about 30 seconds, the
operator panel shows:
┌────────────────────┐
│IBM 7857 AT CMD
aa │
│td_ rd_ dsr ec_ ll_│
└────────────────────┘
This operational message shows that the modem is set in AT command
mode for switched line operation and will auto-answer an incoming call.
The next steps reset the modem options to the factory default configuration 0.
Jump ahead to
step 7 if the modem has never been used.
In the next steps, you are instructed to manipulate the front panel buttons of the
modem. Unless the step suggests otherwise, do not press them in for longer than
1 second.
Step 6. Set the modem power switch to OFF, then hold the
↑
key pressed and
set the power switch to ON. When the message HW SELFTEST RUNNING is
shown, release the
↑
key.
After about 15 seconds the message is changed to DSP SELFTEST
RUNNING and then after another 15 seconds to:
┌────────────────────┐
│IBM 7857 AT CMD
aa │
│td_ rd_ dsr ec_ ll_│
└────────────────────┘
If this sequence does not occur, the modem is defective. Replace it.
Step 7. The next steps can only be done if you have attached the modem to the
public switched network. Go to step 11 if you do not want to test the
modem’s public switched network interface.
Step 8. On the modem operator panel:
Chapter 1. Installing and Setting Up Your Service Processor
1-29