This five-in-one synchronous serial WAN module is designed for the Cisco 2524 and 2525 routers. The Cisco 2524 and 2525 provide LAN and WAN access in a low-cost modular router platform that can grow with your internetworking needs. Both routers can accommodate up to three WAN modules - two synchronous serial and one ISDN.The five-in-one synchronous serial WAN module gets its name from the five types of signaling it supports, which include: EIA/TIA-232, EIA/TIA-449, V.35, X.21 and EIA-530. You can order a DB-60 shielded serial transition cable. The router end of the cable has a DB-60 connector; the other end of the cable has the appropriate connector for the standard interface you specify.