Chapter 1: About SmartBits Chassis
SmartBits 600x/6000x Chassis Features
10 | SmartBits 600x/6000x Installation Guide
• External Time Reference (ETR) support.
External Time References can be used to provide the 10 mHZ and 1 PPS clocks. This
is typically used to synchronize multiple chassis that are separated by a greater dis-
tance than allowed when using an interchassis synchronization cable. The most com-
mon usage of these interfaces is for connecting to attached GPS or CDMA time
reference receivers.
• External clock support.
You can use a standard 10 MHz external clock. Once the SmartBits detects the exter-
nal clock through the BNC connector, it automatically switches to the external clock
for timestamping of latency measurement tests.
The external clock allows you to:
• Synchronize measurements between different systems.
• Use the high-accuracy reference clock often available in large network control
centers.
• Clock Synchronization on Multiple Connected SmartBits.
You can synchronize different systems to one clock by connecting multiple chassis as
described in Appendix A, “Multiple Chassis Local Connect.”
• Reset button.
The Reset button is located above the LEDs on the front of the SmartBits 600x chassis
(see Figure 1-3 on page 11) and the SmartBits 6000B chassis (see Figure 1-4 on
page 13). It is the uppermost button on the SmartBits 600x/6000B chassis.
When pushed in, such as with a paper clip or other small object, the Reset button
resets the chassis hardware and firmware and functions as a warm boot. The Reset
Button on the SmartBits 600x/6000B chassis is recessed and requires the use of a
small object (such as a paper clip or other sharp object).
Note: For information concerning the SmartBits 6000C chassis reset button and other
improvements, see “SmartBits 6000C Chassis Enhancements” on page 16.
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