Owner's Manual

AES
Connector Configuration
The
9-pin
D-type connector labeled
AES/SPDIF
can be configured either
as
an
AES
or
S/PDIF
ded
ic
ated output using
the
AES/
SPDIF
switch next
to
it.
When operating the connector
in
AES
mode, an
AES
cable
is
required. When operating
in
S/PDIF
mode,
the
included
S/PDIF
RCA
cable should be used, which automatically
sets
the
output
stream
to
consumer
mode.
The 1 Wire/2 Wire switch
selects
1-wire or 2-wire mode for the
AES
output
as
follows:
1-wire mode
1
WIRE MODE
9WAY
D-TYPE
2WIREMODE
9WAY
D-TYPE
AES
XLR
BREAKOUT
CABLE
CH 1+2
CH 1+2
NO
OUTPUT
NO
OUTPUT
AESXLR
BREAKOUT
CABLE
CH 1
CH2
NO
OUTPUT
NO
OUTPUT
Selected with
the
switch
in
the
'out' position. The
AES
connector
transmits
two
channe
ls
of
AES
da
ta simultaneously for a
ll
sam
ple
frequencies from 44
.1
to
192kHz, over a single wire.
2-wire mode
Selected with
the
switch
in
the
'in' position.
Th
e
AES
connector
transmits
one channel
of
AES
data only
per
cable, for all
sample
frequencies from 96kHz to
19
2kHz. The reason for
the
two modes
is
that older equipment with 96kHz a
nd
192kHz
AE
S inputs can
only receive
spee
ds
up
to
192kHz
by
using both digital channels
of
a single
AES
connection (known
as
'2-wire'J.
Th
erefore, one
AES
channel can
send
only a single channel
of
digital data. This switch
makes
the
ISA
One
useable
with both old and new equipment.
Word
Clock
In
and
Out
Th
e int
er
nal
ADC
can be synchroni
se
d to an
externa
l word clock.
By
pressing
the
front panel
EX
T sync switch, the
ISA
One can be
switched to lock to either standard external word clock
or
256x external word clock. Eith
er
type
of
external w
or
d clock should be
connected
to
the
optionaliSA
One
ADC
card
at
the
WORD
CL
OCK
IN
BNC
connector on
the
rear
panel.
Th
e
WORD
CLOCK
OUT
BNC
connector either re
generate
s the
ex
ternal
word clock connected
at
the word clock input connector
(if
locked to an
external
clock source)
or
transmits
the internal
sa
mple frequency
of
the
optional
ADC
card
(if
the
ISA
One
is acti
ng
as
word clock master).
Wh
ere
the
ISA
One
is be
ing
used
as
a s
lav
e de
vi
ce within a l
arge
r digital system, the
WORD
CLOCK
OUT
BNC
conne
ctor
can be used
to
pass
on the external word clock signal
to
the
next device.
Wh
en the unit
is
not slaved to
another
device and
is
in
int
ernal clock mode, the word clock output conne
ctor
outputs the sample frequency selected on the
ISA
One front panel (
see
next
sect
ion).
13