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12.6.11 RSC Switch Card
Theory of operation
The RSC- Redundant Switch Control card controls the switchover of the reference clock in redundant systems
with two receiver units. The RSC is used to switchover the pulse and frequency outputs and the serial interfaces
between the available receivers.
The selection of the reference is done by an internal switch-logic of the RSC. The selection of the active
system based on the TIME_SYNC signals which are generated by the receivers. The TIME_SYNC signals are
indicate the synchronization of the clocks.
To avoid unnecessary changeovers in case of repeatedly occurring free run operations of one system, the
master/backup order is changed with each changeover. For example, let’s suppose the current master system
looses its synchronization. Then a changeover is performed to a synchronous slave system and thus the former
slave system becomes a new Master. No changeover is done if both systems are asynchronous. In this case the
current state stays the same.
Important:
To ensure an automatic switchover the Manual function should be disabled via display-menu. "Ref.
Time
→
Switch Unit":
Select Switch Unit
→
SCU Cntl
→
MANUAL: disable
. Otherwise, the system depends
on the clock selected by the manual control function and the unit will not switch over to the current active clock.
Manual Mode (Display Menu)
In this operation mode the selection of the reference clock is done by a display menu. A switchover of the
reference clock in case of an error does not happen, pulse and frequency outputs and the serial interfaces are
always enabled.
Display Menu:
Switch Unit
→
SCU Cntl
→
MANUAL : enable
Note:
For systems without display (M1000S, M2000S and M3000S) a LANTIME Display Unit (LDU) can optionally
be used.
Display menu "Switch Unit
→
SCU State"
->SCU State <
SCU Cntl
SCU INFO
OK
Mode:manual
CLK1:1 CLK2:1
MUX: enabled
Selected Clk:2
This menu displays the status information of the RSC:
Mode:
manual | automatic
Clock 1 / Clock 2:
State of receivers
MUX:
enabled | disabled output signals during a free run
Selected Clk:
selected reference clock 1 or 2
56
Date: 2nd July 2020
IMS - LANTIME M1000
Содержание IMS LANTIME M1000
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