User guide

Introduction
A system dependant delay constant is defined at the system configuration stage.
The MX8400 calculates the latency for individual Encoders and sets buffers
appropriately to ensure all Encoders within the system experience the same network
delay. This is achieved by ensuring the delay an Encoder service experiences is
equal to the predefined system delay constant.
An Encoder at a remote site will experience a larger delay in the network and is
therefore delayed less within the MX8400 input than an local based Encoder service
which is part of that the same Remote Reflex group.
1.3.3.4 Reflex Static Parameters
Table 1.3 lists all the static parameters associated with the Reflex function.
Table 1.3 Static Parameters [Reflex]
Name
Description Value
(25Hz
encoder
system)
Value
(29.97Hz
encoder
system)
Status Update
Period
Interval between V4 Reflex status reports from
encoder.
400 ms 133 ms
V1 Reflex Update
Rate
The rate(times/sec) at which set bit rate
messages are sent to V1 Reflex encoders.
25 s 30 s
Encoder Wait Time
For V1 reflex, the timeout period for all poll
responses from the encoders to be received by
the mux.
25 ms 18 ms
Reflex Delay
Delay in activating a reflex input, after
configuration.
3 s 3 s
V4 Reflex Update
Rate
The rate(times/sec) at which set bit rate
messages are sent to V4 Reflex encoders.
25 s 30
V4 Reflex Mux
Lookahead
The mux lookahead period used to calculate apply
time in V4 Reflex set bit rate messages.
400 ms 330 ms
PCR exchange
interval
Interval between mux sending PCR Exchange
messages to V4 Reflex encoders.
1000 ms 1000 ms
Bit rate On Failure
Delay ms
Delay period before assuming configured bit rate
on failure value for failing V4 Reflex encoder
2500 ms 2500 ms
Reflex broadcast V1 Reflex broadcast messaging - on/off off off
Note: In Table 1.3, V1 Reflex refers to Reflex and V4 Reflex refers to Remote
Reflex.
2/1553-FGC 101 1014 Uen B
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