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Copyright 2007

Access

The term Access Network is used to describe the part of the network that gives the access to and from the customer. For many years this has been centred around the normal POT (Plain Ordinary Telephone) interface. Although this still accounts for the vast part of any network, there are a growing number of interfaces that are available for both business and residential connections.

It should be worth pointing out that there is a great deal of confusion over what the access network offers. It should most of the time be only thought of as the connection method and not the service that is carried over the connection. The most obvious being the POT line I mention before. This is thought of a telephone line, for speech but is just as useful with a modem attached pass digital information.

The table both list a few of the access interfaces that typically on offer.

Medium

Delivery

Connection

Speed

Services

1 Pair Copper

P.S.T.N.

P.S.T.N. LJU

64kbit/s

Voice / Data Dial up

1 Pair Copper

'U' / 'S'

ISDN

2 x 64 kbit/s

Voice / Data Dial up

1 Pair Copper

'U' / 'S'

X.21

2 x 64 kbit/s

Private Circuit / ISP Connection

2 Pair Copper

H.D.S.L.

X.21

N x 64 kbit/s

Private Circuit / ISP Connection

2 Pair Copper

H.D.S.L.

G.703

2.048 Mbit/s

Private Circuit / ISP Connection

DASS / DPNSS / Q.931, CAS

R.F. Cable

Cable Modem

Ethernet RJ-45

Usually limited to 0.5Mbit/s

ISP Connection

Fibre

VC-TS

G.703

Upto 17 x 2Mbit/s

Private Circuit / ISP Connection

DASS / DPNSS / Q.931, CAS

Fibre

STM-1

G.703

Upto 63 x 2Mbit/s

Private Circuit / ISP Connection

DASS / DPNSS / Q.931, CAS

 

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