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Fig. 14
The Transmission maintenance Sub-Terminal,
TST, consists of an Alarm Collection Magazine,
ACM, and fault detection units. Each alarm collection
magazine can be equipped with up to 16
alarm collection boards giving a total capacity of
896 sensing points
a cassette tape unit are also required. All
magazines are placed in BYB201 cabinets.
TMT is controlled by an APN 163 central
processor, and the same type of processor
is also used for the cassette and
file administration.
Each operator's work station connected
to TMT can be equipped with a printer
and a visual display terminal or typewriter
terminal as required, fig. 12.
TCT
TCT, fig. 13, consists of a Supervision
Control Magazine, SCM, and one or two
fault location shelves in the M5 construction
practice, or a fault location
magazine in the BYB construction practice.
The SCM contains an APN 166 processor,
memory units and units for communication
with TMT and TST. The fault
location shelf/magazine contains a remote
power feeding unit and a unit for
communcation with FDU.
TST
TST includes one or several Alarm Collection
Magazines, ACM, and one or
more FDUs for error rate measurements
on terminal repeaters. In many cases
FDUs are integrated in the line systems
The alarm collection magazine, fig. 14,
contains an APN 166 processor, a
modem and alarm collection boards. It
can also include boards for the operation
of control points and alarm repetition.
References
1. Eneborg, M., Insulander, J. and Widl,
W.: Integrated Maintenance of Transmission
Systems in AXE 10 Networks.
Ericsson Rev. 61 (1984):1, pp. 10-17.
2. Nordqvist, G.: AOM101, an Operation
and Maintenance System. Ericsson
Rev. 56(1979):3, pp. 116-123.
3. Arras, J. and Mattsson, 6.: Digital Line
Equipments for 8 Mbit/s and 2 Mbit/s.
Ericsson Rev. 54 (1977):3, pp. 114-
124.
4. Hallberg, P.-A. and Viklund, B.: Construction
Practice BYB for Transmission
Equipments. Ericsson Rev. 57
(1980):4, pp.124-128.