Due to its flexibility and programmability, the SP503 has been finding its way into many new networking products. TheSP503 offers an excellent replacement for discrete solutions on X.25 implementations for frame relay systems, multi-protocol routers and other WAN products where many designs run various modes such as RS-232, RS-422, V.35 or V.36.

■ DTE and DCE configurations with the SP503

■ Connecting the SP503 to a DB-25 connector in DTE and DCE modes

■ Implementing V.35 with the SP503

■ Creating extra single-ended and differential channels with the SP503 using the SP310A and SP485

■ Using external supplies with the SP503