ISDN

ADSL

FTTx, VDSL2,ADSL2plus

EnhancedCopper

Hybrid Fibre/Copper

Pure Fibre

Speed Comparison

Voice bandModem

FTTH

Normal Telephone Line

4 KHz

PSTNPSTN

IP TV Server

Internet

CORENetwork(MPLS)

ADSL MODEMExisting Copper

ADSL MODEM

1.5 to 9 Mbps16 to 640 kbps

ADSL Connection

How does ADSL work• ADSL exploits the ADSL exploits the unused analogue bandwidth unused analogue bandwidth available in the available in the

wireswires

• ADSL works by using a frequency splitter device to split a ADSL works by using a frequency splitter device to split a traditional voice telephone line into two frequenciestraditional voice telephone line into two frequencies

4 KHz

PSTNPSTN DownstreamDownstreamUpstreamUpstream

ADSL Range• In general, the maximum range for DSL without a repeater is 5.5

km • As distance decreases toward the telephone company office,

the data rate increases

• For larger distances, you may be able to have DSL if your phone company has extended the local loop with optical fiber cable

Data Rate Wire gauge Wire size Distance

1.5 or 2 Mbps 24 AWG 0.5 mm 5.5 km

1.5 or 2 Mbps 26 AWG 0.4 mm 4.6 km

6.1 Mbps 24 AWG 0.5 mm 3.7 km

1.5 or 2 Mbps 26 AWG 0.4 mm 2.7

Splitter

ADSL modem

Phone

Telephone line

Voice + ADSLVoice (+ ADSL leakage)

ADSL (only)

ADSL Filter

ADSL - Internet only

ADSL - Internet+Peo TV

O/F

PONOLT

Only Copper to Home

Separate Fiberto Node B

PON for AGW (MSAN),Node B and Customer Premises

O/F

9

Max 4Km Radius

Max 4Km Radius

Separate Fiber to AGW and Copper to Home

10

Access network – Passive Optical Network (PON)

www.slt.lk10

Upto 1Gb/s

11

Access Technologies

FTTN (Fibre To The Neighborhood)

www.slt.lk11

12

Access Technologies

FTTH (Fibre To The Home)

www.slt.lk12

13

WiMAX - Worldwide Interoperability for Microwave Access

.

www.slt.lk 13

NGN