Diagnostics & Loopbacks - Black Box Echo Series User Manual

Diagnostics & Loopbacks
A number of debug options are available. They are described in the table on page 13. It is
possible to loop back any channel bi-laterally (both locally and remotely), to allow data to be
tested for proper operation.
Care should be taken when using external clocks, to either provide the master clock
reference, or simply clock data.
A useful indication of a clock failure is provided by the message 'CLK??' appearing to the
right of the channel rate, as shown below. This indicates that the required external clock is
either running too slow (or not at all) or too fast for the channel rate selected. If internal
clock is selected, this message should not appear.
=============================== 15:35 16/09/96 ==================================
Main Link (EUR)
Mode
Framing
Idle Bandwidth
Clock Reference
Configuration
Nx64 Channel
Rate
Mode
TX Clock
RX Clock
Indicate
---------------------- TIMESLOT MAP --------------------------
0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
---------------------------------------------------------------
R 2 2 1 1 2 2 1 1 1 1 - - - - - D D D D D D D D D D D D D D D D
Cursor Keys to move, CTRL-U to save, ESC to abandon
=================================================================================
Use <SPACEBAR>/<+>/<-> to select
2 MEGABIT E1 MULTIPLEXER
: SYNCHRONISED
: NORMAL * Nx64 Channels
: CRC4 D&I Channels
: 320K System Alarms
: INTERNAL Statistics
: >LOCAL Events
: 1 2 3
: 384K 256K CLK? OFF
: NORMAL NORMAL NORMAL NORMAL
: INT EXT INT
: INT EXT INT
: ON ON ON
TECHNICAL: 0118 931 2233
Echo 2 Mbps Multiplexer
V1.00
: 4
: 1
: None
: Error Counts
: Log
4
OFF
INT
INT
ON
29