• Permanently on: Auto mode
• Slowly flashing: SuperLocal mode.
Basic specifications:
IF frequency range: 50 to 140 MHz
Main Line Loss: Typically 1 dB
Isolation: Typically 60 dB for 70-140 MHz
Oscillator feedthrough: Typically -60 dBm at 1094 MHz
IF connectors: BNC, female, 75 ohm
RF connectors: SMA, female, 50 ohm
RF test output level: Typically -22 dB
RF frequency: IF frequency + 1024 MHz
4.9 Installing the Unit in a Rack (VB220)
The following equipment is needed for hardware installation of the unit:
• 4 rack screws
• A screw driver for the rack screws
• For rear mounting: a size 2 Phillips screwdriver for rack ear screws
• For –48 VDC PSU: cable soldering equipment
4.9.1 Default Installation — Connectors at the Front of Rack
By default the Enhanced and VB200/VB200-DC chassis are shipped with rack ears for front mounting of
the unit. The rack ears are designed to support the weight of the unit, so no additional support, like a
rack shelf, is needed.
When deciding where to locate the unit, make sure there is sufficient space surrounding the unit to
allow efficient cooling, refer to section 4.2.2 for the Enhanced Chassis (VB300) or section 4.5.1 for the
VB200/VB200-DC Chassis.
Use four rack screws to install the unit in the rack.
VB2xx GigE User’s Manual version 5.4 31
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