Cisco NM-4T= network switch

Understanding the 4-Port Sync Serial Network Module (NM-4T) The 4-port synchronous (sync) serial network module (NM-4T) has four DB-60 ports and provides a data rate of 8 Mbps on port 0, 4 Mbps each on port 0 and port 2, or 2 Mbps on all four ports simultaneously. The NM-4T network module only supports sync mode. The DB-60 ports on the NM-4T network module support the Cisco 60-pin "5-in-1" cables used on the Cisco 2500 and Cisco 7000 series routers.