Redundant coupling
22
3.1
The variants of redundant coupling
Redundancy L2E
Release
4.1
03/08
3.1 The variants of redundant
coupling
The control intelligence built into the Switch enables the redundant coupling
of HIPER-Rings and network segments. Two rings/network segments are
connected using two separate paths with one of the following Switches:
X RS2-16M,
X RS20, RS30, RS40,
X MICE (from rel. 3.0) or
X PowerMICE,
X MS 20, MS 30,
X RSR20, RSR30,
X MACH 1000,
X MACH 3000 (from rel. 3.3),
X MACH 4000.
The redundant coupling is effected by the one-Switch coupling of two ports
of one Switch in the first ring/network segment, to one port each of two
Switches in the second ring/network segment (see fig. 7).
Immediately after the main line fails, the Switch opens the redundant line.
When the main line is OK again, the main line is opened again and the
redundant line is blocked again.
An error is detected and eliminated within 500 ms (typically 150 ms).
The redundant coupling is effected by the two-Switch coupling of one port
each from two Switches in the first ring/network segment, to one port each
of two Switches in the second ring/network segment (see fig. 13).
The Switch in the redundant line and the Switch in the main line use control
packets to inform each other about their operating states, via the Ethernet or
the control line.
Immediately after the main line fails, the redundant Switch releases the
redundant line. As soon as the main line is restored to normal operation, the
Switch in the main line informs the redundant Switch. The main line is
released again, and the redundant line is blocked again.
An error is detected and eliminated within 500 ms (typically 150 ms).
The type of coupling primarily depends on the topological conditions and the
desired level of safety (see table 4).
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