 |
|
|
|
|
|
|
|
|
|
|
|
|
| n |
BCDU:Basic Data
Communication Unit: Serves various
|
|
|
data services to
OMU as access to X.25 and LANs
|
|
|
| n |
M: Marker Unit:
Controls concentrators / space switches
|
|
|
| n |
CM: Central
Memory: Contains user database, charging,
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|
signalling,
routing and exchange ensemble.
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|
|
| n |
STU: Statistical
Unit: Collects statistical information on
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|
traffic and
charging.
|
|
|
| n |
CHU:Charging
Unit: Maintains charging database obtained
|
|
from signalling
units.
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|
|
| n |
OMU:Operation
and Maintenance Unit: Allows personnel
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|
|
access to
exchange memory, perform tests an traffic
|
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|
measurements.
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|
