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Non-disruptive switched network back-up is a network configuration which intends to solve problems encountered with conventional 4-wire switched network back-up.
English (United States)
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Non-Disruptive Switched Network Back-Up
Non-disruptive switched network back-up is a network configuration which
intends to solve problems encountered with conventional 4-wire switched
Suppose a line failure occurs at point (A) on the leased line of the multipoint
network shown in the figure. Transmission between the Control Station and
Remote Station 1 should be made possible without disturbing the normal traffic
with Remote Stations 2 and 3. For that purpose, two back-up tributary modems
(2 and 3) are provided for connecting the leased line at the output of the Control
Modem to the Remote Station 1 through a 4-wire switched network link.
Connections are established between modems 2 and 3 so that the Receive
Clock port of modem 2 is connected to the External Clock port of modem 3.
Also, the Receive Data port of modem 2 is connected to the Transmit Data port
of modem 3, and vice versa. Once failing line (A) has been localized, the
switched network back-up connection is established. The set of two modems 2
and 3 behave like a repeater. Once the new configuration, including the back-up
path, is established, the data traffic on the multipoint network may be re-
established as initially.
In addition, logic may also be provided for automatically establishing the
back-up path without any operator intervention.
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