ArcLight Hub User’s Guide
Component Operating Procedures
5-54 1081006 Rev. 001
If
a
BW < 36MHz, it may be necessary to provide
additional filtering at the FLM output. This
determination is situation dependent.
10 Output off isolation > 65 dB
11 Output impedance 75 ohms nom.
12 Output return loss > 15 dB
13 Connector BNC female (75 Ohm)
5.11.2.4 External Reference Interface
The VFLM-70 is provided a reference by the hub. This reference is
distributed to all of the hub components. The input reference
requirements to the VFLM-70 are listed in
Table 5-12.
Table 5-12. FLM Reference Specification
Spec.
No.
Description Limits
1 Reference frequency 10 MHz
2 Reference frequency stability Stability over time and temperature: +/- 0.05 ppm
3 Reference phase noise mask Freq offset
100 Hz: -110 dBc/Hz
1 kHz: -130 dBc/Hz
10 kHz to 10MHz -140 dBc/Hz
4 Waveform Squarewave
5 Level TTL into 50 ohms
6 Duty cycle 50% +/- 5%
7 Input return loss >14 dB
8
Input impedance 50 ohm
9
Connector BNC female (50 ohms)
5.11.3 Installation
5.11.3.1 VFLM-70 Hardware Installation
Please refer to the ArcLight Hub Installation Guide for VFLM-70 cabling
and rack placement instructions.
5.11.3.2 VFLM-70 Software Installation
Please refer to the ArcLight VFLM-70 software release-specific
Installation and Upgrade Procedure documentation available on the
ArcLight Hub Software release CD-ROM for VFLM-70 software
installation and upgrade procedures. VFLM-70 runs the Embedded
Linux OS.
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