| The four-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 cables
Further information on this network module including compatibility can be found here: Understanding the 4-Port Sync Serial Network Module (NM-4T).
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