Solid State Optronics – Special SSR Devices

SSO  founded in 1982 by Zag Kadah develops unique products in the nform of solid state technology devices. SSO was the first company to noffer a solid state relay with over-current protection in an nultra-miniature 4 pin SOP package – .ssousa.com
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nSolid State Optronics – Special SSR Devices
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nProductsn include MOS Output SSRs ,  SCR Output SSRs (Solid State Relays), nMultifunction Telecom Switches, Triac Drivers and many types of nOptocouplers.
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nHow does a telephone line work?
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n”Theren are several different states that the phone line can be in, depending nupon what the phone is doing, and what the phone company is doing to then phone. The central office (or nearby equivalent) applies various DC andn AC voltages to the two-wire phone loop (labeled “tip” and “ring”) nduring these various stages of call progress. In the idle state, the ntelephone company central office applies -48(±6) Vdc….”
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nSolid State Optronics
n2 North First Street, San Jose, CA 95113, USA.