Exfo FTB-8500 Series for FTB-200 Uživatelský manuál Strana 376

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System Tabs
362 FTB-8500 Series and FTB-8120NGE/8130NGE
Clock Synchronization
Frequency: The Frequency alarm indicates if the received signal rate
meets (green) or not (red) the following rate specifications.
LOPPS-L (Loss Of Pulse Per Second - Local) is declared when either
no pulse is received or when no pulse is received within 1 second ±
6.6 μs after the previous pulse. Only supported with 1PPS signal in Dual
Test Set test mode.
Frequency Analysis
Frequency (bps) displays the received DS1/2M/E1signal rate in bps.
Frequency Offset displays the positive or negative frequency offset
between the standard rate specification and the rate from the received
signal. Frequency unit can be set to bps, or ppm. The default setting is
bps.
Note: The frequency value displays “>50” when the frequency offset is bigger
than ±50 ppm. Not monitored for 1PPS interface type.
Signal Rate specification
DS1 1544000 ±15 bps (±9.2 ppm)
E1 2048000 ±19 bps (±9.2 ppm)
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