Traditionally, voice and data communications have been delivered over separate networks. Network managers have accepted this duplication and the associated costs as necessary because of a lack of alternatives and the incremental nature of communication deployments.
The effectiveness of any Distribution Automation solution depends on the reliability of the communications link between devices and the central SCADA system. The intelligence of modern, all digital TDMA-based trunking standards that reliably manage system resources is the key to delivering combined mission critical voice and SCADA networks. At its core, Tait GridLink relies on the Tait DMR Tier III radio platform to provide an extremely reliable and robust communications link delivering market leading critical voice and packet data communications.
The capacity doubling effect of 2-slot TDMA combined with trunking resource management gives network operators new opportunities to:
- Prioritize network resources for voice or SCADA traffic.
- Reserve channel resources for voice or SCADA data so dynamic network loading does not impact the quality of essential services.
- Pre-empt call queues based on call priority and network loading - something DMR Tier II networks or equivalent technologies cannot do.
How does Tait GridLink work?
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- SCADA communications are passed from the control application to the GridLink router, located on the DMR Node, and then transmitted via the DMR Base Stations to GridLink terminals at outstation sites.
- GridLink terminals forward the communications to the outstation RTU/IED and await an acknowledgement if appropriate.
- In the event of RF interference or data corruption, the GridLink system will automatically retransmit messages to deliver highly reliable SCADA communications.
- More than 50,000 GridLink data terminals may be provisioned on a single network (subject to channel capacity). The number of outstation RTUs and associated GridLink SCADA terminals supported by each logical DMR channel is dependent on several factors including number of outstations and frequency of status checks. For systems where outstation integrity checks are executed every 5 minutes, 40 outstations per logical channel are supported. These metrics assume no impact on voice call management and typical SCADA system times.
- Operator commands are transferred, executed and acknowledged in less than 1.5 seconds under both storm and normal operating conditions.
Get an insider's look into what your unified critical communications might look like with this interactive diagram