PLS, SOS, CALLP and the compiler itself are all written in PROTEL. The PROTEL compiler is tightly integrated with the operating system (SOS), application (CALLP), the development environment (PLS) and originally the processor (NT40). The designers of PROTEL significantly extended PASCAL of the day by adding external compilation and extending the data structures available in the language. The PROTEL language was designed to meet the needs of digital telephony and is the basis of the DMS-100 line of switching systems PROTEL is a strongly typed, block-structured language which is based heavily on PASCAL and ALGOL 68 with left-to-right style of variable assignment, variable-sized arrays, and extensible structures. Protel-2 is the object-oriented version of Protel. ![]() It is a programming language created by Nortel Networks and used on telecommunications switching systems such as the DMS-100. Protel stands for "Procedure Oriented Type Enforcing Language". For the former electronic design automation software company, see Protel Systems
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