Transaction Language 1 (TL1) for Remote Alarm Monitoring and Control: Some Advantages and Related Topics
TL1 alarm monitoring is a very important part of many networks today. The proliferation of TL1 RTUs and the following shift to other protocols has created a situation in which versatile alarm monitoring equipment is key. Emerging protocols must be supported, of course, but there are too many TL1 devices in use to ignore them and hope to achieve high network reliability.
In this diagram of a TL1 alarm monitoring system, a versatile alarm master polls TL1 equipment in its native protocol.
There are many advantages to TL1 alarm monitoring compared with monitoring based on other protocols. It receives and reacts to commands from users and masters, is relatively inexpensive, and transmits in a format that is easy for humans to read and understand.
The creators of TL1 also tried to minimize the required bandwidth by creating efficient device responses to queries, filtering all but the requested information.
Overall, however, TL1 alarm monitoring depends on a protocol that is high bandwidth, so transmitting via 1200 baud or dialup is bound to be frustrating. LAN transmission should not be a problem, though.
DPS Telecom offers TL1-based monitoring solutions including products for collecting alarms from TL1 devices, reporting discrete and analog alarms as TL1, and mediating other protocols, like SNMP, to TL1. This lowers cost by eliminating the need to scrap older (yet still functioning) equipment. The T/Mon LNX and the T/MON Slim are two such monitoring solutions that seamlessly integrate older TL1 interfaces with newer SNMP equipment.
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