TM 11-6625-3041-12/TO 33A1-8-908-1
1-16. INPUT/OUTPUT
Data and
The SG-1139 transmits and receives data signals with two types
Timing
of coding (NRZ and diphase) plus a timing signal that is used
for synchronization with NRZ coded data signals. The NRZ
signals can be balanced or unbalanced. Balanced outputs/inputs
use two wires and the signal amplitude is referenced (measured)
from one wire to the other. Unbalanced outputs/inputs use one
wire and the signal amplitude is referenced from that wire to
ground (chassis).
NRZ: A logic 1 is
a high level and a
logic O is a low
level.
Diphase: A transi-
tion occurs at the
start of every bit
period. A logic 0
is a second transi-
tion one-half bit
period later.
Timing: A square wave in which the same type of transition
(low-to-high as shown) occurs at the start of every bit
period.
