Channel Capacity Constraints When Conventional Shares Equipment With Trunking

Equipment and channel quantities that can be supported are limited to the current system, zone, and site constraints for devices and channels for ASTRO^® 25 sites and systems, and by the availability of installed physical equipment and any of their existing interfaces that are unused and can accommodate the device requirements.

Each site type supports specific quantities of Ethernet switches that can provide only a fixed number of Ethernet ports. Site capacity for new channels is limited to the number of Ethernet ports remaining on the Ethernet switches when the maximum number of switches has been installed.

Each IP voted Conventional channel requires two ports to be available on the local Ethernet switching equipment.

NoteFor Ethernet ports, evaluate, as part of pre-planning, how many switch ports are available on the Expandable Site Subsystem switch compared to how many are required for the external equipment. If enough Expandable Site Subsystem switch ports are available, then no external switch is required; otherwise, you must obtain and configure an external switch. Adding an external switch beyond the limit of the trunked IP simulcast subsystem is not supported.

The base radios also have IP port requirements. Either standalone conventional base radio equipment or Conventional GTR 8000 Expandable Site Subsystem can use spare capacity at existing Trunked or Conventional sub-sites.