Edgetech 2000-TVD, User Hardware Manual

Page: 69 / 111

4-3
4.1.2 STARMUX III Digital Telemetry Link
A block diagram of the STARMUX III Digital Telemetry Link electronics is shown in F
IGURE
4-4 . The wiring
diagram is shown in F
IGURE
4-5 , and the electronics chassis is shown in F
IGURE
4-4. The main hardware
elements in the STARMUX III include the following components and circuit boards:
SEA CABLE INTERFACE: The Sea Cable Interface consists of the Sea Cable connector (P2
on rear panel of STARMUX III) and a common mode choke. The
common mode choke is connected in series between the FSIU
(J6) and the Sea Connector on the rear panel (P2).
12 VDC POWER SUPPLY: The 12 VDC Power Supply (PS2) receives AC power from the
Power Entry module to ge12 VDC which is used to power
the ADSL Modem.
375 VDC POWER SUPPLY: The 375 VDC Power Supply (PS1) receives AC power from the
Power Entry module to ge375 VDC. The 375 VDC Power
is output to the FSIU. The PS1 Power Supply also provides a 24
VDC power output to power the digital and analog circuits
located within the FSIU.
POWER ENTRY: The Power Entry module filters the AC power and connects it to
the +12 and 375 VDC Power Supply through the front panel
power switch.
ADSL MODEM: The ADSL Modem board converts the uplink data ADSL signals
received from the towfish and input on the ADSL connector from
the FSIU into Ethernet 10/100/1000BaseT signals which are
output to the 2000 Topside computer. Similarly, the ADSL
Modem board converts the downlink Ethernet
10/100/1000BaseT based command signals from the 2000
Topside computer into the ADSL downlink command signals
which are output on the ADSL connector to the FSIU for
transmission to the towfish thru the Sea Cable Interface (FSIC).
The ADSL Modem also provides the status for power applied to
the modem, status of the ADSL communication link and the
Ethernet LAN connection. +12 VDC power is input on the DC
connector from the +12 VDSC Power Supply.