Nevion ARC-SD-DMUX - Manual (Page 27)

ARC-SD-DMUX Rev. B
nevion.com | 27
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 carrier detected or no carrier
detected.
ceq 0 - ceq 0 cd | ncd Cable equalizer for electrical input.
No control; only used to report carrier
detected or no carrier detected.
cho 0 pri |
pri |
pri
pos man |
pos auto
latch reset
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 reset
cho 0 t1 1000
cho 0 t2 1000 size 3 pri k,l,m auto
t1 t2
size 3 pri k,l,m man
m t1 t2
Video input select
pri: a prioritized list of inputs, used
when change-over is automatic. The
command 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 = internal video generator
3 = mute
4 = none
The card will always reply with 3
priorities, and converts any user input
to 4=none for the priorities that are
logically unreachable, i.e. a generator
that is always present has a higher
priority.
.
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
physical inputs reappear at more or
less the same time, which physical
input will be chosen is unpredictable.
This again due to having one
reclocker only and having to hunt for