Cambium Networks cnReach N500, User Manual

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cnReach N500 User Guide System Configuration
phn-4673_003v000 (November 2018)
2-42
Seamless Serial Service
Seamless serial is a mechanism unique to cnReach allowing for serial-only to serial-only communications
within a subset of a sector (AP to a subset of it’s EPs) while sharing that same sector’s air interfaces for
Ethernet traffic. Using seamless serial, the administrator defines a series of seamless serial groups.
Then when a serial service is set up it can be assigned to a seamless serial group. All serial ports within
that seamless serial group now act as one joined serial port.
Seamless Serial allows you to use a hybrid network with some endpoints supporting full Ethernet
bridging and routing while other endpoints are serial only (and possibly lowpower serial.) A major
benefit of Seamless Serial is multi-point efficiency — you can broadcast the same data to a multi-point
network without duplicating the data across multiple TCP sessions. A single Seamless Serial network
requires a minimum of one AP and one EP. Seamless serial also significantly reduced overhead for
transporting serial data over the air by eliminating Ethernet header and TCP/IP header, replacing these
overheads with a radio group ID. The radio group ID should be the same for all radios sharing the same
serial service.
Seamless serial traffic is sent at higher priority than Ethernet traffic as one of the main goals of seamless
serial is to reduce overhead of TCP/IP communications, increasing efficiency and reducing jitter for
serial services that are time/jitter sensitive.
To configure seamless serial, on a radio, configure a regular serial service TCP terminal client with the
remote IP address as 127.0.0.1 and remote port number the same as the port number configured on the
seamless serial map. For example, 5000 as shown on the screenshot of the seamless serial map. The
following is a screenshot showing configuration of a serial service for seamless serial.