Low-Speed Backbones
ATM
The PeterStar transport network was put into service in the spring
of 1994. The fiber-optics technology STM-16 used provides a data speed
on backbone lines of up to 2.4 Gbps.
The PeterStar transport network is built as a hierarchical structure consisting
of 8 rings. All copper and fiber cables are laid within a closed ducting system.
The network structure provides for 100% redundancy at the expense of automatically
channel routing allowing the selection of an alternative data exchange path
in case of any network segment damaged.
Specificity of the PeterStar network makes it possible to organize high-speed
digital dedicated channels with fiber cable being installed up to the
subscriber’s (2 MBps – 2.4 Gbps trunks), as well as channels at a lower
data speed (19.2 Kbps – 2 Mbps) arranged, at customer’s request, over
copper or fiber-optics cable.
Frame
Relay
Since the beginning of the service provision in 1997 the geography
of the PeterStar Frame Relay network has considerably expanded. Today a
possibility of connecting to the PeterStar Frame Relay network is available
on the whole territory of St. Petersburg and the nearest suburbs such as
Kronshtadt, Zelenogorsk, Sestroretsk, Lomonosov, Kolpino, Krasnoye Selo,
and Petrodvorets.
Based on ATM technology, the basic backbone of the PeterStar Frame Relay
network provides data rates of 155 Mbps between ATM switches. PeterStar
provides such a network load level that the sum of CIR’s on any segment
of the network doesn’t exceed 50% of the capacity of the relevant connections.
Speeds of Frame Relay network access channels on the segment from the
Subscriber’s premises to the network node (AR) may be set within a range
of 19.2 to 2048 Kbps; values from 0 to 0.8*AR Kbps may be set for CIR’s.
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