Aes3 Digital Input And Output - Orban OPTIMOD-FM 8500S Operating Manual

OPTIMOD-FM DIGITAL
•
If an unbalanced output is required (to drive unbalanced inputs of other equip-
ment), it should be taken between pin 2 and pin 3 of the XLR-type connector.
Connect the L
organization's standards) to circuit ground; take the H
maining pin. No special precautions are required even though one side of the
output is grounded.
•
Use two-conductor foil-shielded cable (Belden 8451, or equivalent).
•
At the 8500S's output (and at the output of other equipment in the system), do
not connect the cable's shield to the CHASSIS GROUND terminal (pin 1) on the
XLR-type connector. Instead, connect the shield to the input destination. Con-
nect the red (or white) wire to the pin on the XLR-type connector (#2 or #3) that
is considered H
to the pin on the XLR-type connector (#3 or #2) that is considered L
standards of your organization.

AES3 Digital Input and Output

There are two digital outputs and two digital inputs, the second of which appears
on a BNC connector and also accepts AES3/AES3id or AES11/AES11id sync signals.
(See AES3id Sync Input on page 2-11.) The inputs and outputs are all equipped with
sample rate converters and can operate at 32, 44.1, 48, 88.2, and 96 kHz.
Per the AES3 standard, each digital input or output line carries both the
left and right stereo channels. The connection is 110Ω balanced. The
AES3 standard specifies a maximum cable length of 100 meters. While
almost any balanced, shielded cable will work for relatively short runs (5
meters or less), longer runs require used of 110Ω balanced cable like
Belden 1800B, 1801B (plenum rated), multi-pair 180xF, 185xF, or 78xxA.
Single-pair category 5, 5e, and 6 Ethernet cable will also work well if you
do not require shielding. (In most cases, the tight balance of Category
5/5e/6 cable makes shielding unnecessary.)
The AES3id standard is best for very long cable runs (up to 1000 meters).
This specifies 75Ω unbalanced coaxial cable, terminated in BNC connec-
tors. A 110Ω/75Ω balun transformer is required to interface an AES3id
connection to your Optimod's digital input or output (except for the
sync/audio input, which is terminated with 75Ω).
The digital input clip level is fixed at 0 dB relative to the maximum digital
word. The maximum digital input will make the 8500S input meters dis-
play 0 dB. The reference level is adjustable using the
The 8500S is a "multirate" system whose internal sample rate is 64 kHz and multi-
ples thereof (up to 512 kHz). The outputs processed for analog FM are band-limited
to 16.5 kHz, with a stopband that begins at 18 kHz. Therefore, the output can be
passed through a 44.1 kHz (or higher) uncompressed link without adding significant
overshoot. Because sample rate conversion is ordinarily a phase-linear process that
does not add bandwidth, the 8500S's output signal will continue to be compatible
pin of the XLR-type connector (#3 or #2, depending on your
OW
by the standards of your organization. Connect the black wire
IGH
INSTALLATION
output from the re-
IGH
by the
OW
DI R control.
EF
2-7