External Alarms
29
External Alarms
A number of customer-defined external alarm sources can be supervised
by the RBS. The raising or termination of a supervised external alarm is
reported to the BSC, for subsequent presentation to the operator.
29.1
Concepts
External Alarm
An alarm that originates from a source
defined by the customer
Basic Character set
A subset of the CCITT International
Alphabet No 5, International Reference
Version viz:
Table 17
Basic Character set
Character
Code
Space
20
hex
0
1
2
3
4
5
6
7
8
9
30
hex
- 39
hex
:
;
<
=
>
?
@
3A
hex
- 40
hex
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
41
hex
- 4F
hex
P
Q
R
S
T
U
V
W
X
Y
Z
50
hex
- 5A
hex
_
5F
hex
29.2
Function
Associated with each supervised external alarm are the following
parameters:
Alarm identity
The numeric identity of a specific external
alarm within the RBS.
Alarm severity
There are two possible severity
classifications. The classification of a
specific external alarm is fixed when
defining the external alarm. How to handle
a severity level is customer-defined.
Alarm data
An alphanumeric string which is presented
to the operator when the external alarm is
raised. A basic character set is allowed,
see Section 29.1 Concepts on page 177.
Alarm criterion
The way in which the external alarm
functions, either opening or closing the
circuit on the external alarm input.
Each of these parameters is initially defined manually on RBS
installation, using an OMT. Subsequently any of these parameters may
be modified using an OMT.
The RBS supervises each configured external alarm. An external alarm
is filtered, that is, must remain in a state for a fixed period of time
(approximately 3 seconds) before the BSC is notified of the external
alarm raising or termination.
EN/LZT 123 2697
R5A
1998-08-13
177 (306)
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