Zarządzanie sieciami telekomunikacyjnymi

Zarządzanie sieciami telekomunikacyjnymi

Zarządzanie sieciami telekomunikacyjnymi
Digital subscriber line
DSL or xDSL, is a family of technologies that provide digital data transmission over the
wires of a local telephone network. DSL originally stood for digital subscriber loop,
although in recent years, many have adopted digital subscriber line as a more
marketing-friendly term.
The download speed of consumer DSL services ranges from 256 kilobits per second (kbit/s)
to 24,000 kbit/s, depending on DSL technology, line conditions and service level
implemented.
Typically, upload speed is lower than download speed for Asymmetric Digital Subscriber Line
(ADSL) and equal to download speed for Symmetric Digital Subscriber Line (SDSL).
Source: Wikipedia
W. Daca, Politechnika Szczecińska, Wydział Elektryczny, 2007/08
Zarządzanie sieciami telekomunikacyjnymi
History and science
•
DSL, like many other forms of communication, stems directly from Claude Shannon's
seminal 1948 scientific paper: A Mathematical Theory of Communication.
•
Digital subscriber line technology was originally implemented as part of the ISDN
specification, which is later reused as IDSL.
•
Employees at Bellcore (now Telcordia Technologies) developed ADSL in 1988 by placing
wideband digital signals above the existing baseband analog voice signal carried
between telephone company central offices and customers on conventional twisted pair
cabling.
•
•
In 2007, Dr. John Papandriopoulos, a University of Melbourne engineering researcher,
patented algorithms that can potentially boost DSL line speeds to a maximum of 250
Mbit/s.
Source: Wikipedia
W. Daca, Politechnika Szczecińska, Wydział Elektryczny, 2007/08
Attane FastLink is the universal access
product for the following main business segments…
FastLink
Residential and SOHO customers
• Can be used in any given network
structure.
• xDSL technologies allows
existing copper cable networks
Cor e
Net wor k
• Open interfaces with protocols as
V5.1, V5.2 and CAS implementing
manufacturer-independent access
to any given switch.
• ATM interface to the data network
• Complete end to end management
with the ACI
Attane
Access to Excitement
Information and Communication Networks
ICN AS / AN
Subscriber-Core-Connections
• Multiservice Platform.
Page
• Fast -I nt er net (xDSL)
4/22/2008 7:01
• Tel ephony (POTS, I SDN)
• Modular system for hybrid
network solutions in the
subscriber access area.
Attane FastLink’s flexible system architecture
FastLink
3
Remot e Uni t
Optical
Network Unit
Cent r al Uni t
Optical Line
Termination
ONU
NT
AccessI nt egr at or
1
(Management system)
4
2
3
Tr ansmi ssi on
Syst em
OLT
OLT
Attane
At t ane Fast Li nk
Tr ansmi ssi on
Syst ems
ONU
Access to Excitement
Information and Communication Networks
Local
exchange
ICN AS / AN
Transmission
4
V5.1/V5.2
Dat a
net wor k
ATMnet wor k
Page
Cust omer Uni t
Network
Termination
2
4/22/2008 7:01
1
Attane FastLink provides different feeder types
for reusing existing infrastructure and fast provisioning
FastLink
4
Fi ber
Copper
Tr ansmi ssi on
exi st i ng syst em
Radi o
Pt MP
OLT
ONU
OLT
(50 km bet ween t wo uni t s)
Pt P
ONU
OLT
ONU
OLT
20..30 km
• HDSL Pt P,
r epeat er
avai l abl e
• 2x 2 Mbi t /s
• PDH Pt P (2x2 or
34 Mbi t /s)
• HDB3 Pt P (FMX2R3)
r epeat er s
avai l abl e
• 16x 2 Mbi t /s Pt P
(SRAL)
• DCN vi a ECC
• st andar d f eeder
• cost -r educt i on
• f ast pr ovi si oni ng
• f ast
and f ast
pr ovi si oni ng by
r eusi ng exi st i ng
copper
• speci al
appl i cat i ons (e.g.
i sl and connect i on)
pr ovi si oni ng, e.g.
f or usi ng l eased
l i nes t empor ar y
• SDH r i ngs or
Pt P (STM1 or
STM4)
• sui t abl e f or
br oadband
Attane
3.5 km (HDSL, 0.4 mm)
7 km (HDSL, 0.8 mm)
Access to Excitement
Information and Communication Networks
Pt MP (per WALKai r
BS)
• I nt er f ace:
2 Mbi t /s
el ect r i cal , G.703
ICN AS / AN
OLT
50 km
t r ansm.
equi pm.
10 km
Page
ONU
OLT
ONU
4/22/2008 7:01
ONU
Attane FastLink offers different
xDSL technologies, tailored to the customers needs
FastLink
symmet r i cal
max. downst r eam
8 Mbi t /s
2.3 Mbi t /s
max. upst r eam
800 kbi t /s
2.3 Mbi t /s
max. di st ance
2.5... 5 km
2.5... 5 km
voi ce i nt er f ace
POTS / I SDN
POTS / I SDN
ICN AS / AN
asymmet r i cal
4/22/2008 7:01
symmet r y
Page
ADSL
SHDSL
(ETSI )
Attane
Access to Excitement
Information and Communication Networks
ADSL and SHDSL Frequency Spectrum
FastLink
Up
4
ADSL over I SDN
(DMT)
Down
30
138
I SDN
SHDSL (TC-PAM)
162 196
kHz
1100
kHz
Down
Up
80
1100
276
4
30
138
Page
Voi ce/Dat a
Up/Down
400
(SHDSL)
Attane
Access to Excitement
Information and Communication Networks
ICN AS / AN
P
O
T
S
550
1100
kHz
4/22/2008 7:01
ADSL over POTS
(DMT)
ADSL - The asymmetrical DSL
Principle
FastLink
8 Mbi t /s downst r eam
ADSL
one copper pai r
POTS
or I SDN
spl i t t er
l ong di st ance
e.g. f or 0.4 mm Cu:
• 3...4 km at 6 Mbi t /s ds
Attane
Access to Excitement
Information and Communication Networks
ADSL
Li ne Car d
ICN AS / AN
ADSL
Net wor k
Ter mi nat i on
800 kbi t /s upst r eam
I SDN or
POTS
Li ne Car d
Page
10baseT
NTBA
4/22/2008 7:01
a/b , S0
ADSL is particularly useful for the following
applications:
FastLink
Fast
Downl oad
Fast Li nk
Fast
Downl oad
Fast Li nk
Ser ver
Ser ver
4/22/2008 7:01
Ser ver
Fast Li nk
Tel e-Learner
ICN AS / AN
Fast -I nt er net
Page
Vi deo
on Demand
Attane
Access to Excitement
Information and Communication Networks
SHDSL – The symmetrical DSL
Principle
FastLink
2.3 Mbi t /s downst r eam
S0, a/b
10baseT
I nband
t r ansmi ssi on
of voi ce
2.3 Mbi t /s upst r eam
SHDSL
Net wor k
Ter mi nat i on
I AD
SHDSL
one copper pai r
SHDSL
Li ne Car d
ICN AS / AN
Si ngl e NT,
no ot her equi pment
i s necessar y
e.g. f or 0.4 mm Cu:
• 4.5 km at 384 kbi t /s
• 2.5 km at 2.3 Mbi t /s
Attane
Access to Excitement
Information and Communication Networks
4/22/2008 7:01
Page
l ong di st ance
SHDSL - An excellent choice for business applications
FastLink
Joi nt
edi t i ng
LAN/LANI nt er connect i on
Vi deo
conf er enci ng
Fast
I nt er net
Tel ephony
(VoDSL)
VoDSL: voi ce over DSL
Attane
Access to Excitement
Information and Communication Networks
4/22/2008 7:01
Busi ness subscr i ber s need access t o bot h
t el ephony + symmet r i cal dat a ser vi ces
Page
ICN AS / AN
SHDSL
Zarządzanie sieciami telekomunikacyjnymi
Review Questions
Q—Name the current versions of DSL technology.
A— ADSL, SDSL, HDSL, HDSL-2, G.SHDL, IDSL, and VDSL.
Q—Which versions of DSL offer symmetrical service?
A—SDSL, HDSL, and HDSL-2.
Q—What downstream and upstream rates are proposed for VDSL?
A—The maximum downstream rate under consideration is between 51 and 55 Mbps over lines
up to 300 m in length. Upstream rates in early models will be at speeds from 1.6 to 2.3 Mbps.
W. Daca, Politechnika Szczecińska, Wydział Elektryczny, 2007/08