xdsl modem
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Digital Subscriber Line(DSL)
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xDSL Family Tree
xDSL
Symmetric DSL
Provide identical data rates upstream &downstream
Asymmetric DSL
Provide relatively lower rates upstream but higherrates downstream
Four main variations of xDSL exist:
ADSL-Asymmetrical Digital Subs Line HDSL-High bit/data rate Digital Subs Line
VDSL-Very-high-data-rate Digital Subs Line
IDSL-ISDN Digital Subs Line
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ADSL
Asymmetric Digital Subscriber Line
Used for applications which require greaterdownload bandwidth but require relatively little in
opposite direction like Web browsing; Filedownloads
An ADSL circuit connects an ADSL modem oneach end of a twisted pair telephone line creatingthree information channels
A high speed downstream channel
A medium speed duplex channel
A basic telephone service channel
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ADSL
Allows simultaneous access to theline by the telephone and the
computer In case of power/ADSL failure, data
transmission is lost but basictelephone service will be operational
Can work up to a distance of 3.7 to5.5 kms depending upon the speedrequired
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Data Rate - Wire Size Distance
ADSL
Data Rate Wire Size Distance
1.5-2.0 Mbps 0.5 mm 18000 Feet 5.5 Kms
1.5-2.0 Mbps 0.4 mm 15000 Feet 4.6 Kms
6.1 Mbps 0.5 mm 12000 Feet 3.7 Kms
6.1 Mbps 0.4 mm 9000 Feet 2.7 Kms
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RADSL
Rate-Adaptive DSL
Is a form of ADSL
Automatically configures themodem at startup to adjust its rateaccording to the quality of phoneline
Supports a maximum of 1088 kbps
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ADSL Deployment Today
Central OfficeHome/Office
ADSL
CPE
Curb
ADSL up to 5Km
SHDSL (PAM16) up to 5KmSHDSL
Splitter
DSLAM
Data switch
Voice Switch
POTS
2 wire
2 wire
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DSL Technologies Evolution of
Network
Central OfficeHome/Office
ADSL
CPE
C r
ADSL up to 5Km
SHDSL (PAM16) up to 10KmSHDSL
IAD
VDSL
IAD
S litter ONU OLT
DSLAM
VDSL up
to 1.5Km
Fiber
VoDSL
VOICE
Fiber
Multicast
TV
S litter
4-wire
SHDSL
Voice SwitchIP Phone
POTS
IP Phone
POTS
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HDSL
High bit/data rate DSL
Can be viewed as equivalent of PCM stream
Offers the same bandwidth both upstreamand downstream
Can work up to a distance of 3.66 to 4.57kms depending upon the speed required
Can deliver 2048 kbps On 2 phone lines, each line carrying 1168 kbps
On 3 phone lines, each line carrying 784 kbps
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HDSL
No provision exists for voice becauseit uses the voice band
HDSL-2 is proposed as nextgeneration HDSL over single phoneline
Requires more aggressivemodulation, shorter distance andbetter phone line
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SDSL
Symmetric Digital Subscriber Line
Rate adaptive version of HDSL
Does not support analog calls
Works up to 3.7 kms on 0.5 mm dia cable Affordable alternative to dedicated leased
lines
SHDSL-Symmetric High-bit-rate Digital
Subscriber Line is an further improvementover HDSL/SDSL and uses single phoneline
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VDSL
Very-high Data-rate DSL
Also known as BDSL
Originally named VADSL (A Asymmetric) but was later extended tosupport both symmetric & asymmetric
Requires one phone line
Supports voice & data Works between 0.3-1.37 kms depending
on speed
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Upstream data rate of 1.6-2.3 mbps
Downstream data rate of 13-52 mbps
Data Rate - Wire Size Distance
VDSL
Downstream Upstream Distance
12.96 Mbps 1.6-2.3mbps
4500 Feet 1.37 Kms
25.82 Mbps 1.6-2.3mbps
3000 Feet 0.91 Kms
51.84 Mbps 1.6-2.3mbps
1000 Feet 0.30 Kms
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IDSL
ISDN DSL-a hybrid DSL/ISDN solution
Works over existing ISDN connection
Increases ISDN speed from 128 kbps to144 kbps
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What is a Cable Modem?
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PLC
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The Distribution System
Insert Power Line
Carrier at middle
voltage
Backhaul to NAP
(fiber, DSL, wireless,
satellite)
Gettingbeyond thetransformer
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Requirement at Customer End
BSNLs BFone
Computer of minimum configuration, with
10/100 Mbps Ethernet Card
DSL Modem + Splitter
PPPoE software to be loaded in the Client
Broadband Account (Username and Password)
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UT- 300R ADSL CPE
Product Features
One RJ 45 andOne RJ-11 ports available
Supports ANSI T1.413, G.DMT and G.LITE
Supports swappable Bridge and Router
mode
Supports IP routing and NAT/NAPT function
Supports DHCP server anddynamic
allocation ofIP address
Built-inIP filter and access logsHigh reliability, easy operation and low power
consumption
Web based configuration and monitoring
Interoperable with other DSLAM
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How to connect Multiple Telephones
(1) Phone Socket
(2)&(3) Phone
(4) ,(6)& (7)
RJ-11 Tel cable
(5) Splitter
(8) Phone Jack
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highpass
filterLINEDSL
lowpassfilter
TELE
Circuit Diagram of A POTS Splitter
Splitter
Separates the 300 Hz to 3500 Hz voicechannel from upstream anddownstream channels
Reduces traffic congestion
Pass voice, dial tone, ringing and
on/off hook signals Consists of a lowpass filter (LPF) for
POTS and a highpass filter (HPF) forupstream/downstream channels
Passive device
Contains lighting protection circuitry
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CPE Installation
BRAS
CPE
PPPoE Session
T2 Switch
T1 Switch
BRAS
CPE
PPPoE Session
T2 Switch
T1 Switch
Bridge Mode
DSLAM
IP Address is allocated
to PC ByBRAS
Router ModeIP Address isallocated to CPE
ByBRAS
IP Address is
allocated
to PC By CPE
NATDSLAM
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Multi User Customer
BRAS
CPE
T2 Switch
T1 Switch
Bridge Mode
DSLAM
IP Address is allocated
to PCs ByBRAS
Multi User Customer
If a user is allowed to login multiple sessions with
BRAS with same password, every machine esta lishesa separate PPPoE Session with BRAS. Every machine
Gets full andwidth for that account provided CPE -
DSLAMLink supports that.
Switch
ADSL Port on DSLAM Should
allow that many MAC addresses
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Multi User Customer
BRAS
CPE
T2 SwitchT1 Switch
Router Mode
DSLAM
IP Address is allocated
to PCs By CPE
Multi User Customer
In this mode PPPoE is configured on CPE and only
One session is esta lished etween CPE and BRAS.
CPE gets IP Address from BRAS. DHCP in CPE
Allocates IP addresses to machines. In this case all
The machines share the andwidth allowed for that
Account. CPE has to do NAT also.
Switch PPPoE Session
NAT
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IP DSLAM
P-Slot
PCU
ICMSlots
UniversalSlots (1 16)
116 B A
Fan Fuses
Power In
Chassis Ground
Ext. Alarm
Integrated
Splitter Shelf
Fan Fuses
Power In
Chassis Ground
Ext. Alarm
Integrated
Splitter Shelf
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DSL Technologies
Technology ITU-TStandard
Distance Downstream
Data Rate
Upstream
Data Rate
ADSL G-992.1 3.5 Kms 8 Mbps 640 Kbps
Splitterless ADSL G-992.2 4.0 Kms 1.5 Mbps 512 Kbps
ADSL-
Extended Bandwidth
G-992.5 1.5 Kms 16 Mbps 100 Kbps
2 Wire High-Speed DSL G-991.2 3.0 Kms 2312 Kbps 2312 Kbps
4 Wire High-Speed DSL G-991.2 3.0 Kms 4624 Kbps 4624 Kbps
Very High-speed DSL G-993.1 300 Mts 52 Mbps 6-26 Mbps
Very High-speed DSL G-993.1 700 Mts 26 Mbps 26 Mbps
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NIB-II Broadband DSL Deployment
Normal Line
Ex Side Line SideMDF
InternetGE/FE
Normal Line
DSL Line
Normal Line
Normal Line
Normal Line
DSL Line
DSL Line
Telco Switch
DSLAM
POTS Line
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Customer Premises Installation
Splitter ADSLRJ 11 RJ 11
RJ 11
RJ 11
RJ 45
Line
Single User with
Voice and Data
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Customer Premises Installation
Splitter ADSL
STB
RJ 11 RJ 11
RJ 11 RJ 45 RJ 45
RJ 45
AV Port
Single User with
Voice, Data and Video
Line RJ 11
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Customer Premises Installation
Splitter ADSL
Switch
Multi user Business
Customer
Line
RJ 11 RJ 11
RJ 11
RJ 45
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ADSL POTS Splitter
DSLHigh pass
filter
Low pass
filter
Telephone
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