Alstom MiCOM P54 Series, Technical Manual

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Measurements and Recording P54x/EN MR/La4
MiCOM P543, P544, P545 & P546
(MR) 8-15
MR
MEASUREMENTS 4 Column:
Channel 1 and Channel 2 propagation times are displayed in seconds. These times are the
ones calculated with asynchronous sampling (some times called “ping pong” method).
Ch1/Ch2 Rx Prop Delay Ch1 and Ch1/Ch2 Tx Prop Delay are displayed in seconds. These
times are the ones calculated with synchronous sampling (by using GPS), therefore they are
displayed only when GPS method is active (setting PROT COMMS - IM64/GPS
Sync/Enabled)
‘Channel Status 1’ is a diagnostics flag associated with Channel 1 condition (Channel 2 is
the same).

Bit “Max Tx-Rx Time” If the
GPS Synch
is enabled and the
TxRx Time Stats
is
enabled, this bit indicates that the delay time between
message transmission and reception is above the setting.

Bit “Max Prop Delay” If the
Prop Delay Stats
is enabled, this bit indicates that the
propagation delay time is above the setting.

Bit “H/W B to J mode” If a relay suffix K (or higher) is communicating with a relay
suffix B, G or J, this bit is
1

Bit “Passthrough” This indicates that, in a three-terminal configuration, Ch1 data
has been received on Ch2 via the self healing ring
mechanism.

Bit “Message Level” Is indicative of the quality of the signal on Channel 1

Bit “Timeout” Indication that no valid messages are received over Channel 1
during the ‘Channel Timeout’ window

Bit “Mismatch Rxn” Indication of mismatch between the InterMiCOM
64
Ch1 setting
and that of the associated multiplexer

Bit “Path Yellow” An indication of one way communication. The local relay is
being informed by the remote connected relay that the
remote connected relay is not receiving messages from the
local one.

Bit “Signal Lost” An indication from the associated multiplexer that Channel1
signals are being lost.

Bit “Mux Clk F Error” This is an alarm that appears if the Channel 1 baud rate is
outside the limits 52 Kbis/s or 70 Kbits/s

Bit “Remote GPS” Indicates the status of the remote GPS on Channel 1

Bit “Local GPS” Indicates the status of the local GPS on Channel 1

Bit “Tx” Indication of transmission on Channel 1

Bit “Rx” Indication of reception on Channel 1
‘IM64 Rx Status’ is a 16 bit word that displays the status of received commands as
1
or
0
.
‘Last Reset on’ displays the time and date of last statistics reset.
‘Ch1/Ch2 No. of valid messages’ displays the number of received valid messages over
channel 1/2 since last statistics reset.
‘Ch1/Ch2 No. of Errored messages’ displays the number of invalid messages over channel
1/Ch 2 since last statistics reset.
The number of errored messages complies with ITU- G8.21 and is as follows: