NEC 2000 IPS manual Zone Transceiver II ZT

Chapter 16 Wireless System

Zone Transceiver II (ZT)

Access to the communications network by the Dterm PS III user is gained through radio connection with one of the several Zone Transceivers installed on the premise. ZT’s are placed strategically around the establishment in an overlapping fashion to provide continuous radio coverage throughout the specified area. The number of Zone Transceivers needed to provide service for any single establishment is defined by several factors:

The total area requiring wireless service, which is a function of the area of operation of the users of the Dterm PS III handset. Even in the case of providing a small number of handsets, if staff whose job requires wireless service throughout the whole facility uses them, the number of ZT’s is determined by the size of the facility, not the number of users.

The configuration, environment and construction of the building(s) in the areas requiring coverage have considerable impact on the effective coverage area of any one Zone Transceiver. Spacing of ZT’s is adjusted according to these conditions resulting in considerably different quantities needed to cover equal amounts of square footage when compared from site to site.

Special conditions, such as coverage inside elevators and stairwells (both are typically not covered). In addition, accommodating high traffic areas will result in additional Zone Transceivers. Typical deployments provide access to at least 2 ZT’s from most locations identified for coverage. By placing ZT’s in closer proximity to each other than normal spacing, access to more ZT’s in any one spot is supported. In any one zone (an area covered by one ZT, but potentially equipped with more), up to 36 simultaneous calls can be supported within the given 10MHz of the U-PCS band.

Each Zone Transceiver provides for up to three simultaneous connections to Dterm PS III users within the covered area. As users communicating through a ZT move out of its range and into an area covered by another ZT, the connection is automatically switched (called a handover) to the new ZT (noticeable by a momentary disruption in talk path (Note)). With the proper placement of ZT’s throughout the facility, users can move about the area while communicating (or idle) and have their calls follow them.

The ZT is supplied with mounting hardware and can be installed on walls, mounted on solid ceilings or placed above drop ceilings. The Zone Transceiver II is also offered with a weather resistant outdoor enclosure, mountable on outside building walls or poles. Options for both fan cooled or heated enclosures are also available.

ZT IIU can be deployed using 1 pair or 2 pair wiring.

Note: With ZT’s version 7.2 or higher seamless handover can be achieved.

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