User's Manual

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System Configuration Introduction – p. 11
(Cable/Wireless Modem Termination System) end and an E1/T1 capable
cable/wireless modem at the downstream end.
The data from the IP, E1/T1, or PSTN layer are encapsulated as DOCSIS frames
which in turn are converted into RF signals and sent over the air or via an HFC
(Hybrid Coax Fibre) plant between the WMTS and modem.
Important Note: connectivity MUST be obtained at each
layer, beginning with the lowest (RF link) in order to
establish full communication.