3
Converters can be added to unfilled positions in the chain and the settings will be
“uploaded” from the new unit to the Control Unit automatically. Conversely, when a
failed unit or switch is replaced in the redundancy chain the settings are “downloaded” to
the unit position from the settings stored in the Control Unit. This simplifies the converter
replacement process. The Control Unit is equipped with redundant hot swappable
power supplies. In the event of a power supply failure the Control Unit can remain fully
operational while the power supply is replaced.
To reduce operating costs the NSU may be placed in an unoccupied facility and be
totally controlled and monitored from a remote system controller. All front panel controls
and indications are available to a host monitor and control system. The Control Unit is
equipped with an Ethernet interface and an RS485/RS422 Serial Port interface. As an
option the RS485/RS422 Serial Port interface can be replaced with an RS232 Serial Port
interface.
A strong feature set of monitor and control functions supports powerful local and remote
control. In addition, any converter in the redundancy chain with a remote interface can
be controlled directly from the NSU Control Unit. An event log is continuously updated
with time stamped records of activity for the NSU. The resident firmware can be easily
updated via the Ethernet port.
1.1.3 NSU MODEL NUMBERS
The NSU1 is a 1:1 configuration with the switch modules integrated into a 1 rack high
chassis with the control unit. The NSU2 is a 1:2 configuration with the switch modules
integrated into the 1 rack high chassis with the control unit. The NSUN is a 1 rack high
control unit that is expandable up to a 1:12 configuration with external Redundancy
Switch Modules (RSMs). The Switch Modules specified below are intended for use with
the NSUN and can be ordered individually using the part numbers given. The standard
9800 and 9900 Series converters have been designed to physically accommodate the
Switch Module.
Redundancy Switchover Systems
(1RU Controller With Integrated Switches)
1:1 integrated switches 1 IF 75 ohm, 1 RF 50 ohm
NSU1-B75/S50
1:1 integrated switches 1 IF 50 ohm, 1 RF 50 ohm
NSU1-B50/S50
1:1 integrated switches 1 IF 75 ohm, No RF
NSU1-B75
1:1 integrated switches 1 IF 50 ohm, No RF
NSU1-B50
1:1 integrated switches No IF, 1 RF 50 ohm
NSU1-S50
1:1 integrated switches No IF, 2 RF 50 ohm
NSU1-S50/S50
1:1 integrated switches 2 IF 50 ohm, No RF
NSU1-B50/B50
1:1 integrated switches 2 IF 75 ohm, No RF
NSU1-B75/B75
1:2 integrated switches 2 IF 75 ohm, 2 RF 50 ohm
NSU2-B75/S50
1:2 integrated switches 2 IF 50 ohm, 2 RF 50 ohm
NSU2-B50/S50
1:2 integrated switches 2 IF 75 ohm, No RF
NSU2-B75
1:2 integrated switches 2 IF 50 ohm, No RF
NSU2-B50
1:2 integrated switches No IF, 2 RF 50 ohm
NSU2-S50
1:2 integrated switches No IF, 4 RF 50 ohm
NSU2-S50/S50
1:2 integrated switches 4 IF 50 ohm, No RF
NSU2-B50/B50
1:2 integrated switches 4 IF 75 ohm, No RF
NSU2-B75/B75