Black Box LRU4240 - Manual (Page 101)

Dual Trunk E1 Router
Dual Trunk E1 Router User’s Guide TECHNICAL: 0118 96 56 000 89
No response from any unit on the
communication network. • Bad cable.
• Wrong baud rate.
• Hung terminal. Restart terminal
session.
• Make sure that Pin 8, CTS, is not
connected at the ASCII terminal
end of the COMM Port cable.
• Standard Black Box COMM Port
cables do not have this connection
at the ASCII terminal end. Some
ASCII terminals will activate the
CTS line, and thus interfere with
the LRU4240 collision avoidance.
• Get a null modem adapter to cross
pins 2 and 3 (transmit and receive)
on the terminal.
• The COMM Port cable is connected
to an inactive or faulty port on the
terminal, or the terminal is faulty.
• Replace the COMM Port cable if it
is faulty.
• Make sure the COMM Port
parameters match the terminal’s
parameters.
No response from some units on
the network. • Mismatch baud rate.
• Break in cable.
• Make sure the LRU4240 is
powered up.
• Make sure the unit ID is correct.
• Swap the connector positions with
a unit that has no problem
communicating with the terminal,
to find out if a portion of the
COMM Port cable is faulty.
• Make sure the COMM Port
parameters match the terminal’s
parameters.
Invalid data is received from one
or all units on the network. • Baud rate configuration.
• EMI.
• Two units with the same ID.
• Make sure the COMM Port
parameters (on the problem units)
match the terminal’s parameters.
• Verify that none of the units are
missing an ID and that no two units
have the same unit ID.
Table 11-1 Unit Problems (3 of 4)
Symptom Probable Cause Solution