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DMS-MTX DualMode Metrocell Cell Site Description
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Introduction
Northern Telecom's DualMode Metrocell
As cellular systems evolve to the digital format, service providers and mobile
subscribers are confronted by a mixture of analog and digital technologies.
Northern Telecom (Nortel)’s dual mode cellular product allows a smooth
transition from analog to digital technology. It uses Time Division Multiple
Access (TDMA) technology for digital systems and Advanced Mobile Phone
Service (AMPS) technology for analog systems. This evolutionary strategy
enables service providers to gradually upgrade their cellular systems to digital
while providing support of existing analog equipment.
The Nortel cellular system supporting dual mode service includes the following
components:
• the DMS-MTX switch containing the Intelligent Cellular Peripheral (ICP)
unit at the mobile switching office
• dual mode cell sites with the configurable DualMode Radio Units (DRU)
on a Radio Frequency (RF) Frame and the Integrated Cellular Remote
Module (ICRM), on a Common Equipment (CE) Frame at the cell site
• external and internal interface links.
The Nortel DualMode Metrocell serves as the intelligent interface between a
Digital Multiplex Switch - Mobile Telephone Exchange (DMS-MTX) and its
registered cellular mobiles. It is a dual mode cell that works in both the analog
(AMPS) mode and the digital (TDMA) mode.
The Metrocell is designed for high density, small radius cells in areas where
large traffic capacity is required. It can exist independently or it can be added
to existing cells for increased coverage. The Metrocell provides a reduced
power output for urban applications. The typical power output of the Power
Amplifier (PA) is 22 watts (43.5 dBm).
Figure 1-1 shows the architecture of a DualMode Metrocell system and
Figure 1-2 is a block diagram of the product of the system.