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Štvrtok, 21. novembra 2024
Digitálny spojovací systém EWSD (Electronic Worldwide Switch Digital)
Dátum pridania: 16.03.2002 Oznámkuj: 12345
Autor referátu: Pisti
 
Jazyk: Slovenčina 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.
 
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