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ArcLight Hub User’s Guide
Component Operating Procedures
5-52 1081006 Rev. 001
Figure 5-36. VFLM-70 Rear Panel
5.11.2 Physical Interfaces
5.11.2.1 Serial Port Interface
The Serial Port signals are defined as listed in Table 5-10.
Table 5-10. Service Port Signal Description
Signal
No.
Signal
Name
Signal Function I/O Direction
(relative to FLM)
1 RXD Receive data I
2 TXD Transmit data O
3 GND Signal ground
5.11.2.2 Ethernet Interface
The VFLM-70 Ethernet interface is an RJ-45 10/100 Base-T interface
complying with the physical and electrical characteristics of the IEEE
802.3 specification.
5.11.2.3 RF Transmit/Receive Interfaces
The VFLM-70 has 4 Tx/Rx interfaces all on its rear panel. It, however,
really uses one of those interfaces – Rx In BNC. The VFLM-70 transmit
port (Rx In 70-Mhz 75-Ohm BNC) connects to the PCMA Hub Canceller
(PCMAHC) and through it to the appropriate upconverter. In some
situations, the VFLM-70 will first pass through an uplink power control
device. Table 5-11 lists the specifications for the transmit interface and
the transmitted signal.
Table 5-11. RF Transmit Interface and Transmit Signal Specifications
Spec.
No.
Description Limits
1 Output power range -5 to –25 dBm in 0.1 dB steps
2 Output level variation < 1 dB p-p from 52 to 88 MHz
3 Frequency tuning range 52.0 to 88.0 MHz
4 Frequency tuning step size < 1kHz
5 Transmitted frequency stability Stability is established by the FLM reference source.