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Nortel Meridian is a private branch exchange telephone switching system. It provides advanced voice features, data connectivity, LAN communications, computer telephony integration CTI , and information services for communication applications ranging from 60 to 80, lines. SL stands for Stored Logic. It was introduced by Northern Telecom in December , with an original capacity from to 7, lines, and became the first fully digital PBX announced on the global market aimed at the smaller PBX market.
In the early s, most PBXs were either electromechanical e. For this reason, the SL-1 enjoyed a great success on the enterprise market both in North-America and globally. Its success went on to power the company into a leadership position in the telephony world, and led to expanded designs "up and down" to provide products at all sizes, including the DMS series high-end machines, and the Meridian Norstar for smaller installations up to users. The SL-1 was gradually enhanced peripheral hardware, packaging, etc.
The Meridian has 43 million installed users worldwide, making it the most widely used PBX. Resellers, and accessory manufacturers frequently but erroneously use the phrase "Meridian Option" to refer to the Meridian 1 range, to distinguish it from the smaller and larger Norstar and SL It provides 16 voice and 16 data communication links between a Meridian 1 switch and modular digital telephones. The digital line card supports voice only or simultaneous voice and data service over a single twisted pair of standard telephone wiring.
Up to 16 cards are supported. The digital line card circuitry is mounted on a The card connects to the backplane through a pin edge connector.
The faceplate of the digital line card is equipped with a red LED that lights when the card is disabled. When the card is installed, the LED remains lit for two to five seconds as a self-test runs. If the self-test completes successfully, the LED flashes three times and remains lit until the card is configured and enabled in software, then the LED goes out.
If the LED continually flashes or remains weakly lit, there is a fault detected in the card. The digital line card is equipped with 16 identical digital line interfaces. Each digital telephone and associated data terminal is assigned a separate Terminal Number TN in the system database, giving a total of 32 addressable units per card. Time Compression Multiplexing TCM is the standard communication protocol used by Nortel digital telephones on a 2-wire tip and ring circuit.
The circuit interface operates by a transformer coupling which provides foreign voltage protection between the TCM loop and the digital line. The introduction of Release 3. From Wikipedia, the free encyclopedia. For the nuclear reactor, see SL For the car, see Saturn S-Series. Retrieved August 29, Retrieved 28 April Archived from the original PDF on 14 January Retrieved 17 January Retrieved 23 September Retrieved 2 September Retrieved from " https: Telephone exchanges Nortel products Computer telephony integration.
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