cm-100mm-s1st20d - fast ethernet fiber to fiber media converter managed module 100base-fx 1310nm multimode (st) [2 km/1.2 miles] to 100base-bx 1550nm tx / 1310nm rx single strand fiber, single mode (st) [20 km/12.4 miles]. managed or unmanaged operation. reliably extend multimode to multimode or multimode to single mode fiber. designed to be used with the perle mcr1900 media converter chassis. when used with the perle mcr-mgt management module you will have extensive security, network integration and ease of use features. tacacs+, radius, ldap, kerberos, nis and rsa. manage via snmp, cli- telnet/ssh or https.