The development of TASK network started in 1993. The network distinguishes from other Polish metropolitan networks in that it is stretched along the Gdansk Bay coast from Gdansk through Sopot to Gdynia on a distance of about 50 km. Currently, the whole length of fibre cable amounts to 160 km. The TASK network has connections to the main Internet operators in Poland: POL-34/155, POLPAK-T, TEL-ENERGO, NASK and others. It consists of 40 networks and access nodes based on routers that work both in Gigabit Ethernet and ATM switches that work in OC3 155 Mb/s and OC12 622 Mb/s. The network involves 70 LANs of scientific and research institutions, currently over 20,000 computers, servers and workstations.

The TASK network is administered and monitored permanently using management stations located at the Computer Center.

Network Topology

Continuous development of TASK network led to its current topology that implements ATM, Gigabit Ethernet technologies.

The network cabling structure consists of a backbone that works in the 10Gigabit Ethernet or Gigabit Ethernet, and a mesh that works in ATM (155/622Mb/s) technology. The internal, layer structure of the network involves:

  • optical fibres
  • ATM backbone
  • digital links
  • IP backbone - LAN routers and switches.

The ATM backbone comprises about 20 ATM switches and exploits the dynamic routing protocol PNNI in the ATM layer. The main backbone line works with the channel capacity of 622 Mb/s.

There is a possibility to make digital links of the E1 or E3 capacity based on the ATM backbone. This can be implemented by the Circuit Emulation Service. Such links have been used to make connections within the Gdansk Medical Academy telephone exchanges (HICOM 330 and HICOM 350E). The transmission passes through the TASK network that works in ATM technology at 155 Mb/s and 622 Mb/s based on switchable circuits SoftPVC of CBR type in dedicated bandwidth of 2 Mb/s. Node switches of the TASK network have been equipped with IOS 11.2.2 software that realizes voice transmission through the ATM network. The Computer Centre supervises this part of the telecommunication network that works in ATM technology. The whole system is remotely monitored and administered from a SUN workstation installed in the Center.

Logically, upon the ATM backbone operates the IP backbone, which consists Gigabit Ethernet backbone, and about 20 routers and 20 LAN switches. Physically, these devices are connected by means of the ATM backbone.