Edgetech 2000-CSS, User Manual

Page: 56 / 101

4-4 4.0: TECHNICAL DESCRIPTION
2000-CSS COMBINED SONAR 0017423_REV_C
FSIU The FSIU board mounts to the STARMUX III chassis. The FSIU
connects between the Sea Cable Interface (FSIC) and the ADSL
Modem in the STARMUX III chassis. The FSIU board 24
VDC on J3 from the PS1 (24VDC) output to power the digital and
analog circuitry. The FSIU board also inputs 375 VDC power from
PS1. The 375 VDC power is output to the towfish on J6 combined
with the frequency shift keyed (FSK) responder trigger signal
input from J1 and the ADSL downlink command and uplink data
signals from J9. The ADSL command signals are input and the
data signals are output on J9. The FSIU also provides the current
sense output (J7) and the Fish Power ON status output (J4) which
drives the Fish Power Indicator on the front Panel.
4.1.2.1 Selecting Negative Edge Triggering for the Optional Responder
The 2000-CSS has the ability to be configured with an optional responder in the towfish. If ordered from
the factory with a responder installed, the STARMUX III will have a jumper installed in the location shown
in
F
IGURE
4-2 , and the customer does not need to take any further steps.
However, if a responder is installed at a later time, a jumper, selecting for negative edge triggering needs
to be added to JP6 on the power board of the STARMUX III as shown in
F
IGURE
4-2 . To locate the Power
board, refer to the F
IGURE
4-3 .
Figure 4-2: Location of Jumper JP6 on the Power Board in the FSIU STARMUX III