Reference Manual

Table Of Contents
12 (110) BRU1/BRU3 MANUAL
BRU1/BRU3 MANUAL, Doc.no: b3fb_ref Uen Rev PJ5, 2004-02-19
3.2 External Tests requiring External Hardware
Some of the external tests require external hardware. The external tests in
question are:
Loopback Test of FNB Board
Loopback Test of Ethernet in FIB Board (BRU1 only)
RFTL Test of FRB Board
Modem Tests (BRU3 only)
A Loopback test is carried out of the FNB Board by using a 25 pin D-Sub plug.
One of the physical ports is selected according to strapping alternative RS232
or RS422.
For the BRU1, the corresponding serial interfaces are tested when testing the
FIB board.
Also for BRU1, a loopback test of Ethernet in FIB Board is carried out, using
the external ethernet plug.
An RFTL test is carried out of the FRB Board by using an external radio
instrument. A predefined bit stream (Tx-signal) is transmitted from the node to
the RFTL-adapted instrument, where the signal is measured and retransmitted
as an RX-signal back to the node. A bit error count is carried out by comparing
the signals.
One modem test is carried out requiring a test modem and a connection cable to
the node’s line port. Applicable to BRU3 only.
3.3 Start of FBTEST
At the BOOT command prompt “CMD>”, type TE and then press <RETURN>.
The FBTEST program will be loaded and the Main Menu will be displayed
ready to accept commands from the user.
To execute the command frame mode of FBTEST, set the SW2 dip switch on
the FCB-board in the following position: SW2:4 (OEM-Strap) to Open. For
more information, see Node Hardware Library/BRU3/BRU3 Mechanical
Design/FB Computer Board - FCB and BRU3/BRU3 Logic and Radio System/
Modem Equipment. For BRU1 information, see corresponding documents in