4Links Diagnostic SpaceWire Interface DSI-RG408, User Manual

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Diagnostic SpaceWire Interface
EtherSpaceLink family User Manual
15. Un i t-to-Un i t T i me-T ag S ynch r on i s a t i on
M ult i p le E t h e r S pac eL i n k fa m i l y un i t s ca n be l i n k e d to g et h e r to s y n ch r on i z e t h e ir i nte r n a l c lo ck s . Th is
a
llo
w s s y
n
ch r
on
is
e
d
out
p
ut
s ac r
o
ss
mult
i p
le boxe
s a
n
d
t
i
me t
a gs
to be t
h
e
s a
me
ac r
o
ss
mult
i p
le un
i
t
s
.
Th e ha rd wa r e o p t i on “S” is r e q u ir e d to p r ov id e t h e ne c e ss a r y S MA c onne c to rs on e ach un i t t ha t w i ll be
s y
n
ch r
on
is
e
d -
e.
g
. DS
I - RG 4
0
8 -M
S.
U n i t s a r e s y n ch r on is e d w i t h a d a is y-cha i n ca ble bet w een t h em - u si n g r e a r -pa nel S MA c onne c to rs J 7
a
n
d
J
8
.
Th
e
s
e
c
onne
c
to
rs a r
e
gr
ou
p
e
d i
n
pa irs
(J
1 -
J
2,
J
3 -
J
4 ,
J5
-
J
6 a
n
d
J
7 -
J
8
)
w i
t
h
bot
h c
onne
c
to
rs i
n
a pa ir
c
onne
c
te d to g et
h
e r (loo
p-
t
h
r ou g
h
). I n t
h
e
f
ollo
w
i n g i llu s t r
a
t i on s,
c
onne
c
to rs J 7
a
n d J 8
a
r e
i
nte
r cha
n
g
e
a
ble.
U n i t s to be s y n ch r on is e d a r e c onne c te d to g et h e r b y S MA- S MA ca ble s, a n d 50 Ω te r m i n a to rs mu s t be
a dd
e
d a
t e
ach
en
d
o
f
t
h
e
cha i
n.
Th
e t
w
o
c
onne
c
to
rs i
n
a pa ir a r
e
si
m
p
l
y w ir
e
d
to e
ach
ot
h
e
r a
n
d
m
ay
be u s e d a s a loo p- t h r ou g h c onne c t i on , o r a r e sis to r m ay be i n s e r te d i nto one o f t h e c onne c to rs s o t ha t
t
h
e ot
h
e
r f
o
r
m
s a
te
r
m
i
n
a
te
d c
onne
c
t
i
on.
Power
Connector
SMA:J1
Power
Connector
SMA:J1
Power
Connector
SMA:J1
Power
Connector
SMA:J1 J2 J3 J4 J5 J6 J7 J8
J8 J7 J6 J5 J4 J3 J2
J2 J3 J4 J5 J6 J7 J8
J8 J7 J6 J5 J4 J3 J2
T
Terminator
T
Terminator
Fig u r e 1 5. 1: Da i s y-cha i n i n g t h e t i m e s y n ch r on i s a t i on c onne c t i on s
“ T ” i n di ca te s a 50 Ω S MA te r m i n a t i on.
Th
e tot
a
l len
g
t
h
o
f ca
ble u
s
e
d i
n t
h
e
d a is y-cha i
n mu
s
t not ex
c
ee
d
50m (
16
5
f
eet).
4Links Limited
www.4Links.co.uk
support@4Links.co.uk
page 41 of 130
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