User Manual

Installation Guide
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Downstream and Upstream Frequency (Channel) Configuration
The customer cable modem should never be configured to acquire a specific downstream
frequency as there is not a one-to-one correlation between the cable network downstream
frequency and the downstream frequency output by the ARCXtend CPE. The
downstream frequency output by the ARCXtend CPE is a purely a function of the
downstream wireless channel selected.
When multiple downstream and/or upstream frequencies (channels) are used on the cable
network, the “AutoFrequencySet” feature must be disabled and the “CATV EIA Input
Channel” and the “Upstream Frequency” must be set manually. Alternatively, the correct
downstream and upstream frequency can be included in the embedded cable modem
configuration file in which case the “AutoFrequencySet” feature can be used.
TCP/IP Port Filtering
TCP/IP port filtering is the practice of selectively enabling or disabling Transmission
Control Protocol (TCP) ports and User Datagram Protocol (UDP) ports on computers or
network devices. The following ports must be open for SNMP, HTTP, and TFTP
applications to be performed on the Hub:
• Port 161/162 for SNMP
• Port 80 for HTTP
• Port 69 for TFTP