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Digitálny spojovací systém EWSD (Electronic Worldwide Switch Digital)
Dátum pridania: | 16.03.2002 | Oznámkuj: | 12345 |
Autor referátu: | Pisti | ||
Jazyk: | Počet slov: | 1 074 | |
Referát vhodný pre: | Stredná odborná škola | Počet A4: | 4.1 |
Priemerná známka: | 2.97 | Rýchle čítanie: | 6m 50s |
Pomalé čítanie: | 10m 15s |
General system data.
Busy hour attempts
(BHCA) 2,500,000 BHCAs as in
ITU-T recommendation Q.543
(depending on the features,
the traffic distribution and the
call mix)
Perfomance and reliability as in ITU-T recommendations
Q.541 and Q.543
Tranmission as in ITU-T recommendations
characteristics Q.551
Earthquake immunity Bellcore TR-NWT-000063
(NEBS) Earthquake Zone 4
Lightning protection as in ITU-T recommendations
K.20
Electromagntic as in EN 55022 (interference
compatibility radiation) and EN 50082 (inter-
ference immunity)
Network interworking System-integrated interfaces
in accordance with international
standarts to other networks, e.g.
packet network
Clock precision, plesiochronous 10e-9; synchro-
maximum relative nous 10e-11
frequency deviation
Power dissipation
in the busy hour < 1 W per line unit depending
on node configuration and size
Applications.
a)PSTN-/ISDN nodes (EWSD)
Local/transit node
Number of subscriber lines up to 250,000
Number of trunks up to 60,000
Traffic capacity up to 25,600 erlangs
Remote control unit (RCU)
with up to 6 DLUs
Number of subscriber lines up to 4,976
Remote digital line unit
Number of subscriber lines
in rack up to 1,760
in shelter up to 168
Container node
Number of subscriber
lines per 12,192-mm
(40') container up to 8,640
6,058-mm (20') container up to 4,800
2,991-mm (10') container up to 1,920
b) Rural nodes (EWSD)
Compact node (CDE)
Number of subscriber lines up to 15,000
Small node (SDE)
Number of subscriber lines up to 3,000
Remote control node (RCU)
with up to 6 DLUs
Number of subscriber lines up to 4.976
Remote digital line unit (CDE)
Number of subscriber lines
in rack up to 15,000
in shelter up to 168
Container node (CDE)
Number of subscriber
lines per 12,192-mm
(40') container up to 8,640
6,058-mm (20') container up to 4,800
2,991-mm (10') container up to 1,920
b) Access network (Multilink)
Multilink family
Interfaces to network node V5.1, V5.2; PDH/SDH/ATM
Number of 4 to 4000 (analog/ISDN basic
subscriber accesses access/ISDN primary rate
access
Cascading via V5.1 interface
with multiplexers/radio
systems
Services largely combinable
Interfaces to
Telecommunication
Network Management
(TMN)
Trunks.
Analog trunks various loop and
shunt resistances possible
Digital trunks via 1,544-kbits/s
or 2,048-kbit/s multiplex lines
Signaling systems all the standards signaling
systems, e.g. the
ITU-T systems R2, No.5, No.7
Signaling
transmission methods all the standard transmission
methods for signaling,
e.g. dc, ac, inband, outband,
multifrequency code, channel
associated signaling (CAS),
common channel signaling
(CCS).
Analog subscriber accesses
Characteristics various loop and
shunt resistance possible
Pulse dialing 5 to 22 pulses/s
Multifrequency dialing as in ITU-T recommendation
Q.23
ISDN Access.
Basic access 160 kbit/s (2B+D+Sync.)
B = 64kbit/s, D = 16kbit/s
Primary rate access 2,048 kbit/s (30B+D+Sync.)
or
1,544 kbit/s (23B+D+Sync.)
Signaling in the D channel (transmission
of signaling has priority over
other packet data
Common Channel Signaling. Number of
signaling links up to 1.500 per network node
Number of
signaling link sets up to 1,024 per network node
Number of
signaling links up to 16 per signaling link set
Signaling transfer rate:
Signaling transfer point
(STP) up to 100,000 MSU/s
Signaling point (SP) up to 100,000 MSU/s
(message signal units)
Signaling relay point (SRP) up to 4,000 GTT/S
(global title translations)
Call charge registration.
All the standard methods,
such as periodic pulse metering,
detailed billing local and central
(AMA, LAMA, CAMA),
interadministration revenue
accounting (IARSTAT/IARAMA)
Zone and tariffs up to 511 zones
up to 6 tariffs per zone
Tariff switchover possible in 15-minute steps
Local charge storage in CP memory
Charge saving automatic, 8 times per day on
duplicated MDD (with AMA
data can be more frequently)
Charge data processing output on tape or file transfer
to a revenue accounting office
Traffic routing.
Alternate routing per destination up to 7 high
usage routes 1 last-choice
route
Selection of an idle
trunk in a trunk group sequential or random
Number of trunk groups
per network node up to 1,000 incoming and
up to 1,000 outgoing and
up to 1,000 bothway
Space requirements.
(Examples:the areas given also include the service and
side aisles)
Local nodes with 10,000 subscriber lines:
aprox. 27m2
Transi nodes with 10,000 trunks:
aprox.