Klein 3000 Series Operation And Maintenance Manual page 161

To power up the TPU and verify proper operation of the TPU and LAN:
1. With the towfish and LAN cables removed from the TPU, turn the power on,
listen for the cooling fan to come on, and then measure the voltage at the
TOWFISH connector which should be 200 VDC. This will test the basic TPU.
2. Turn the TPU off.
3. Connect the LAN cable through the hub to the computer. You will see the
computer port on the hub lit.
4. Turn the TPU on. The TPU port on the hub will light. This will add the LAN side
to the TPU test.
5. Turn the TPU off.
6. Connect the towfish cable to the TPU.
7. Turn the TPU on.
There will then be light activity on the CPU board as the system looks for the
boot program on the host computer and then initializes. The CARRIER LOSS
and LOCK LOSS lights, which are shown in Figure C-13 on page C-18, will
be on until the TPU finishes its boot cycle with the host computer (about 45
seconds). Once the boot sequence is complete, the lights will go out.
The boot process sequence may be monitored with an external terminal or with
Windows default terminal Hyperterminal. (See "TPU LAN Configuration Setup"
on page C-5.)
If the CARRIER LOSS and LOCK LOSS lights do not go off on the first try, turn
the TPU off and back on. If the CARRIER LOSS and LOCK LOSS lights are still
on, check for a towfish fuse failure or cable assembly problems; for example:
miswire, open, using too long a cable, using wrong type of cable, or a failure in the
towfish. Re-check to see if you have a proper system boot sequence.
Transceiver and Processing Unit
C-19