This document provides information about a 3Com 503A0023-2C ATM 4 Port Optical Fiber Module, including how to purchase it from Launch 3 Telecom. Launch 3 Telecom is an online retailer that specializes in telecom equipment and offers competitive pricing, quality customer service, and genuine 3Com replacement parts. They accept various payment methods and can provide same-day shipping for orders received by 3PM along with order tracking and warranty support. Launch 3 Telecom also offers services like repairs, maintenance contracts, de-installation, and recycling.