For dumb-terminal hook-ups and other serial/parallel extension applications. Our modular cables are constructed from silver satin wiring, and are ideal for cost-saving voice and data applications not requiring high data rates. These cables are available in lengths up to 100ft, or can be custom manufactured to meet your application needs. Straight through-pinned modular cables are used for RS232 modular adapters for dumb-terminal hook-ups and other serial/parallel extension applications.