Launch 3 Telecom sells a LINKSWITCH MAIN PCB FOR SUPERSTACK II (part number 1690-260-000-1.00) manufactured by 3Com. They offer competitive pricing, quality customer service, and expertise in telecom products. Customers can purchase the part by phone, email, or by filling out a request for quote form online. Launch 3 Telecom provides same-day shipping for orders placed before 3 pm EST along with order tracking and a warranty. They also offer repair, maintenance, installation, and asset recovery services for telecom equipment.