OPERATION2-122.4.3 Ring In/Ring Out PortsThe Ring Out (RO) and Ring In (RI) ports on the MicroMMAC-T, shownin Figure 2-11, support trunk cable connection to ring ports on otherToken Ring concentrators. RI/RO connections can be established withany of the standard media types supported by the TPIMs that install in theRI/RO receptacles. Ring ports provide signal re-timing. Also, the ring portautowrap feature helps preserve ring integrity by shutting down ring portsin the event of beaconing conditions originating from ring segmentsconnected to ring ports.Figure 2-11 Ring PortsSee the MicroMMAC-T Local Management Guide for information aboutenabling and disabling RI/RO ports and Section 4.4 for a description ofTPIM models and instructions on configuring and installing TPIMs in theRI and RO receptacles.2.4.4 STH STACK PortsThe four STH STACK ports, shown in Figure 2-12, support connection toCabletron Systems HubSTACK series of non-intelligent STH Token Ringhubs. See Section 4.5 for instructions on how to connect STH hubs to theMicroMMAC-T and the MicroMMAC-T Local Management Guide forinformation about using Local Management to establish a single TokenRing or multiple Token Rings from the MicroMMAC-T and STH hubassemblage.Figure 2-12 STH STACK PortsRO RISTACK2 STACK3 STACK4 STACK5
