Nevion DWC-HD-DMUX - Manual (Page 25)

DWC-HD-DMUX Rev. F
nevion.com | 25
6.2.2 Normal control blocks
Block Blk
#
Commands Example Response Control
pin 0 on | off pin 0 on
pin 0 off cd | ncd Pin diode for optical input. No control
available, except to turn power to the
pin diode on or off. The info string
reports carry detect or not carry
detect.
ceq 0 - ceq 0 cd | ncd Cable equalizer for electrical input.
No control; only used to report carry
detect or not carry detect.
cho 0 pri |
pri |
pri
pos man |
pos auto
latch on |
latch off|
latch reset
rule lol |
rule los |
rule trse
t1
t2 cho 0 pri 0
cho pri 0 1
cho pri 10 2
cho 0 pos man 1
cho 0 pos auto
cho 0 latch on
cho 0 latch off
cho 0 latch reset
cho 0 rule lol
cho 0 rule los
cho 0 rule trse
cho 0 t1 1000
cho 0 t2 1000 size 3 pri k,l,m auto
latch
t1
t2
size 3 pri k,l,m man
m latch
t1
t2
Video input select
pri: a prioritized list of inputs, used
when change-over is automatic. The
list can have 1, 2 or 3 entries, or
levels. Manual mode is effectively the
same as automatic mode with one
priority level only, but has its own
command.
0 = from optical input
1 = from electrical input
2 = generator (from cho 1)
latch: can be either
on or off and selects if the change-
over is latching or not, used when
change-over is automatic. Latch on
means that if we've lost our main
source and moved on to a lower
priority level, we'll not search to see if
the higher pris will reappear.
rule: can be either los, lol or
trse, which means loss off signal,
loss of lock, and timing reference
signal error. This determines what
triggers an automatic change-over.
t1 and t2: change-over doesn't
happen immediately, as a precaution
against glitches and unstable signals.
The timers t1 and t2 let the user
decide how long (in ms) we will cling
on to a missing input before we
consider it gone and move on to the
next pri level, and how long an input
with a higher priority should be
present before we consider it
repaired and switch back,
respectively.
Note 1: the latch setting only applies
to rule los.
Note 2: the card change back to
physical inputs from generators
regardless of latch setting. As a side
note, this means that t2 is important
even when rule=lol and/or latch is on.
Note 3: If we have selected rule=lol
and a 3-level pri list with two physical
inputs on top and a generator at the
bottom and we're in generator mode
(lost both physical inputs) and both