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LTU/NTU SZ-DOC-W5-1.pd
f
Operating Manual
V
ersion: 1.5
Revision: 2002-09-10 42
7 Monitor
7.1 General
The units can be connected to a terminal or a PC with a terminal emulation in order to monitor
relevant events and to display additional information such as signal quality of the DSL link or the
G.826 error performance parameters. In addition, full system configuration and fault localization
can be done over the monitor interface.
The terminal for monitoring should be VT100 compatible and be configured as follows:
9600 baud, asynchronous
8 bits, no parity, one stop bit
XON/XOFF enabled
No new line on carriage return (i.e. no line feed on carriage return)
7.2 Addressing
7.2.1 LTU
There is a point / multipoint TTL-bus (9600 baud) on the subrack's backplane. The TTL to RS-
232 level conversion is done on the ACU where the monitor connector is located.
In order to re-enable communication of LTUs occasionally left in XOFF state, it is
recommended to start each session with Ctrl-Q (=XON) followed by an ECHO command.
At any time, only one of the LTUs in the subrack can be logically connected to the monitor
interface. The appropriate LTU interface is addressed (i.e. selected) according to its physical
position in the subrack, starting with the leftmost slot number 01 and ascending rightwards to
number 12. If one LTU supports a second interface, it may be addressed by adding 12 to the
address of the first interface.
To select the first interface on the LTU in slot number SN, just type “%SN“ at the terminal, even
in the case it does not show any prompt. (e.g. to select the LTU in slot 01, type “%01”). To select
the second interface (optional) in the same slot number, just type “%(SN+12)” at the terminal.
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