IBM 300 Service Manual page 47

Figure 1-38. 7857 Rear Panel
1. ___ Be sure that the power switch located on the modem rear panel is off.
2. ___ If you are going to use a switched line telecommunication cable, plug it
into the PSTN socket located on the modem rear panel with the ferrite cylinder
at the modem side. If this modem is not being installed in the United Kingdom,
connect the other end of the cable to the telecommunication line.
3. ___ If you plan to use a leased line telecommunication cable, plug it into the
LL jack located on the modem rear panel with the ferrite cylinder at the
modem side. If this modem is not being installed in the United Kingdom,
connect the other end of the cable to the telecommunication line.
4. ___ Connect the modem power plug to a standard 3-pin grounded ac outlet.
Then, if this modem is being installed in the United Kingdom, connect the
telecommunication cables that you have attached to the modem to the
telecommunication lines.
5. ___ Observe the modem power-on sequence. This is the normal power-on
sequence:
v PWR light is turned on.
v HW SELFTEST RUNNING message displays for about 15 seconds.
v DSP SELFTEST RUNNING message displays for about 15 seconds.
Set the modem power switch to ON. If the PWR light is not ON, or the
message HW SELFTEST RUNNING does not appear 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 until 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:
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. Go to
step 7 if the modem has never been used.
Installing the NAS and Its Modem
Chapter 1. Installing and Configuring the NAS and Its Modem
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