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DASTAG: Passive Antenna Monitoring

The RNS DAS Monitoring System monitors each antenna in a DAS (Distributed Antenna System) and will notify the user of any signal drops or degradation.

The notification will include a detailed description corresponding to the site layout document (spiderdiagram), for example “DAS Monitor alert: Building X, Location X - Sector 1 - 1st Floor – ANT22”.

The DAS Monitoring System consists of the following key elements:

  1. DAS Monitoring Tag (DMT)
  2. DAS Monitoring Receiver (DMR)
  3. DAS Control Server (DCS)
  4. Quadplexer

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DASTAG: Passive Antenna Monitoring

1. DAS Monitoring Tag (DMT)

The DAS Monitoring Tag (DMT) comprises an 868MHz Radio transmitter. It transmits its unique ID at predefined intervals and has an on-board, non-rechargeable battery with a minimum projected life of five years. The DMT requires no maintenance during its operational life.

The RF output power of the DMT is 3dBm. The DMT is mounted directly onto the antenna during the installation, and can also be easily mounted onto existing antenna installations.

DASTAG: Passive Antenna Monitoring

2. DAS Monitoring Receiver (DMR)

The DMR is connected to the DAS System through a band-pass filter (Quadplexer).

The DMR receives the unique ID from each of the DAS Monitoring Tags (DMT) and determines the signal strength from each of the DMTs.

The data is captured, decoded, and stored by the DMR and then transmitted via the GSM Network to the Control Server where alerts are triggered based on per-configured criteria.

The DMR is powered with 220VAC and receives the information from DMTs at 868MHz. The dynamic range of the system is more than 60dB.

3. DAS Control Server (DCS)

The Internet connected DCS receives, handles and stores data from the DAS Monitoring Receivers (DMRs) and provides the interface between the remote monitoring systems and the system users.

A secondary live backup server, database replication and on- and off-site backups ensure data security.The DCS provides a web interface as well as SMS, email and SNMP trap capability to distribute the data and notifications to users.

DASTAG: Passive Antenna Monitoring
DASTAG: Passive Antenna Monitoring

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