Operation Manual
6. Appendix
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C SERIES Operation Manual rev 2.0.0
6. Appendix
6.1. Maintenance
During normal operation your C Series amplier will provide trouble-free service. The only user maintenance
required is to periodically vacuum clean the foam dust lters behind the front grille.
In some extreme cases it may be necessary for authorized service personnel to clean the inside of the amplier in
order to safely remove dust or other build-ups which may occur during prolonged normal usage. If you are using
your amplier in a heavy-duty application, it is recommended to have your amplier serviced every three years
purely as a preventative action.
6.2. FAQ
Following are common questions asked about LAB GRUPPEN C Series power ampliers together with helpful
answers.
Q: What is the input sensitivity of the ampliers?
A: Input sensitivity is calculated from the amplier gain, maximum output voltage and load. As gain and output
voltage are adjustable in C Series ampliers, you need to look this information up in a table found in the Appendix
section of this manual. Input sensitivity also is automatically calculated in the DeviceControl software application.
Q: What are the maximum cable lengths allowed when using the NomadLink network?
A: NomadLink uses a daisy-chain topology to connect ampliers and an NLB 60E in a network. Standard RJ45-
equipped Cat-5 cables are used throughout. The daisy chain may be made into a closed-loop by connecting a
return cable to the NLB 60E from the last amplier.
General rules of cable lengths:
• The maximum cable length in between any two devices may not exceed 300 meters / 980 feet.
• In a non-closed-loop daisy-chained subnet the maximum cable length is 400 meters / 1300 feet.
• In a closed-loop subnet the maximum cable length is 700 meters / 2300 feet.
Exceeding these limits may result in lost contact with the devices, or loss of phantom powering due to cable
resistance.
Q: How long can cable-runs be on the Ethernet network connecting the NLB 60E to the PC?
A: On the Ethernet side, normal Ethernet cable limits apply. This is typically a maximum of 80 meters / 300 feet
between each device. Follow standard installation procedures for Ethernet. Distances beyond 100 meters may
require use of a repeater, a format converter, or optical cables.
Q: Why is the NomadLink network a closed-loop topology?
A: Technically speaking, the closed loop is optional. The purpose of closing the loop is primarily to provide a
secondary path to the ampliers. If cables are broken or disconnected in either direction, all ampliers still may be
addressed by the network.