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	LinkTest™ SINGLE    GL's LinkTest™ SINGLE is a sophisticated bit error rate tester in a compact, hand held package. The unit can test a wide variety of communications facilities and equipment including Asynchronous, Synchronous, T1, fractional T1, E1, fractional E1, modems, multiplexers, CSU/DSUs, T1 ESF CSUs, DU, NTUs and TIUs.
	LinkTest™ SINGLE+    GL's LinkTest™ SINGLE+ is a sophisticated bit error rate tester in a compact, hand held package. The unit can test a wide variety of communications facilities and equipment including DDS, T1, fractional T1, E1, fractional E1, T3and E3NTUs, multiplexers, CSU/DSUs, T1 CSUs, DTUs and TIUs.
	LinkTest™ DUAL    GL's LinkTest™ DUAL is a sophisticated bit error rate tester in a compact, hand held package with dual interfaces and a full color display. The unit can test a wide variety of communications facilities and equipment including T1, fractional T1, E1, fractional E1, T3 and E3 modems, multiplexers, CSU/DSUs, T1 CSUs, DTUs, NTUs and TIUs.
	LinkSim™    GL's LinkSim™ simulates a variety of communications links, inserting delays and inserting errors such that the user can determine what effects these impairments will have on their systems.