User Manual

Central Terminal Level Control Unit
Operators Manual
GSI 002
605-0000-428
Issue 1.2. Date 5/11/98
Page 7 of 14
6. Menu Displays
Note :
# = Numerical value
* = Alphabetical character
6.1. Status
The status display is shown at all times and indicates the current selected shelf,
transmit or receive polling, and state of communication with shelf controller.
Select a Shelf 0E-
1-R
>Shlf 1< Shlf 2 0--
Shlf 3 Shlf 4 ---
Communication Status
Error Status
Level Control Operation
Status
Shelf 1
Shelf 2
Shelf 3
Shelf 4
The Level Control Operation Status column (see figure above) indicates the
shelf configuration status and state of communication between the shelf
controller and LCU. Possible states are:-
- = No Shelf present or configured.
0 = Shelf present and configured but level control operation is not taking
place .
1 = Shelf present and configured and level control operation is taking place.
The Error Status shows that errors have been detected during polling.
The Communication Status column indicates the direction of
communications with the shelf controller.
T = Transmit data is being sent to the Shelf Controller.
R = Receive: Data is being received to the Shelf Controller.
- = Idle a pause in communication between the SC and LCU (this state is
usually momentary).
The example shown in the figure above shows shelf 1 is configured and there
has been an error between the shelf controller and the LCU. Shelf 2 is in
communication with the shelf controller and packets being received (R). Shelf
3 is configured it is not currently active. If no attempt at convergence is in
progress, as will often be the case all shelves are marked ‘0’. Shelf 4 is not
provided or equipped.