Optical Access Systems


GPON allows simultaneous transmission of Ethernet and RF TV signal through a single optical fiber. This feature ensures the network provider lower investment and network management costs as GPON passive optical network reduces the required number of fibers to the user. In case of particular need smooth transition to dual fiber access solution is possible.

GPON network is an Optical Distribution Network – ODN based on Gigabit bandwidth optical networking technology and is composed of two basic components:

  • Optical Line Termination – OLT,
  • Optical Network Unit – ONU.

Point – point

Point to Point optical access networks are designed to provide each user a pair of fibers (only one fiber solution can be done as well, if requested). The advantage of such networks is unshared optical media, which enables:

  • High reliability of the network,
  • The network is very scalable for future needs,
  • A smooth transition from low (10Mb/s) to higher (up to 10Gb/s) speed network access (10/100/1000/10G),
  • Very flexible design and modification of network topology and
  • Tools for monitoring and troubleshooting the network.

Copper twisted pair Access


xDSL based Solutions are used on existing copper twisted pair and is same as GPON and point – point available within single network element that combines all the above mentioned technologies.


Asymmetric Digital Subscriber Line (ADSL) is used on the existing copper pair between the user (Customer Premises Equipment – CPE) and PBX (Central Office – CO).

Frequency Division Multiplexing – FDM technology allows simultaneous use of data services and analogue or ISDN telephony.

Advantages of ADSL technology:

  • Use of existing copper infrastructure,
  • Users maintain existing equipment for telephone service.


Very high bit rate Digital Subscriber Line (VDSL) is used on the existing copper pair between the user (Customer Premises Equipment – CPE) and PBX (Central Office – CO).

The advantages of VDSL technology:

  • Use of existing copper infrastructure,
  • Users maintain the existing equipment for telephone service,
  • Higher transmission speed than multi-ADSL (57Mbit/s downstream (towards user) and 25Mbit/s upstream (towards network) as opposed to 24Mbit/s downstream and 3Mbit/s upstream for multi-ADSL (Annex M).


VDSL2 standard is a superset of the standard VDSL1 which defines Discrete Multi-Tone (DMT) modulation.

Key Features:

  • Higher transmission speeds than VDSL1 (up to 100 Mbit/s symmetrical),
  • Addition to the trellis encoding,
  • Added some characteristics similar to ADSL2 + (loop diagnostics).


Technology Symmetric High-speed Digital Subscriber Line (SHDSL) is based on the ITU-T (G.991.2 – G.shdsl) recommendation that describes the various methods of transport in the access networks.

The technology is intended for symmetrical data transmission via copper pairs from/towards the user. With SHDSL technology high transmission speeds and symmetrical transfer over copper access network can be achieved. The SHDSL technology is suitable for business users who can transfer data applications which require high transfer speeds in both directions of the network (downstream and upstream), which is not provided by asymmetric technology.

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