DVD-301-01-x Installation & Operation Manual
Document # 540257, Rev B, 08/2005
Page 12 of 39
3.4.3 Video Lines
Composite video connections shall be shielded coaxial cable in
accordance with the military specifications of
M17/94-RG179
.
3.4.4 AI’s RS-485 Data Bus
3.4.4.1 The DVD-301-01-x
is designed to interface with other
Audio International equipment via AI’s proprietary RS-485
serial data bus. The data bus shall
be implemented using
a twisted shielded pair cable in accordance with
MIL-W-
22759
. The wire size for the conductors in this cable shall
be 22 AWG, MINIMUM. Shield pins are available for
connecting data bus shields when required.
3.4.4.2 Refer to AI document 650007 for RS-485 Serial Data Bus
design architecture.
3.4.5 Digital Audio Lines
All digital audio cabling shall be 100/140
µ
m (core/cladding) multi-
mode fiber optic cabling. All fiber optic connectors/couplers shall
use ceramic ferrules to minimize adverse reflection effects.
BRAND-REX P/N: OC-1011 fiber optic cabling is recommended for
use for all digital audio cabling.
3.4.6 Analog Audio Lines
To reduce the opportunity for electrically-induced ground-loop
noise, Audio International recommends that all analog audio wire
connections be twisted shielded cable with the shield properly
grounded at the source (ideal practice) and floating at the load end.
If shield cannot be grounded at the source, then ground at the load
end with the source end floating. The shield for each cable length
shall be terminated at one end only. Terminating both ends of a
shield is NOT recommended, and highly increases the likelihood of
creating unwanted electrically-induced ground-loop noise into the
analog audio signal. Twisted shielded cable shall be 22 AWG
(minimum) for low-level audio signals or 16 AWG (minimum) for
speaker-level audio signals and shall be in accordance with
MIL-W-
22759
. Individual conductor wire gauge in each twisted shielded
cable assembly shall increase accordingly with analog audio signal
type and any significant increases in cable routing.
