IBM IBM 8272-108 LAN Streamer Token Ring Switch

The IBM 8272-108 LAN Streamer Switch provides eight token-ring ports plus one expansion slot. The switch can be rack mounted or stacked.Each token-ring port contains an independent MAC and is capable of operating at either 4 or 16 Mbps.Each port can be attached to separate, shared-ring segments via the IBM 8230, 8226, or similar token-ring concentrators.Each port will also support FDX operation as described in this paper when attached to a compatible station. For example, an FDX link is established when an 8272 switch is attached to another switch or to a station via a two-pair cable(See Figure 8).The expansion slot can be used to add additional, token-ring copper or optical fiber ports or to add high-speed,uplink ports. A 155-Mbps ATM port can provide connection to a campus ATM switch or hub. Another option provides 100-VG Any LAN connectivity with token-ring framing. The switch supports adaptive cut-through operation independently at each port, thus reducing the propagation of frame errors from noisy segments. Packets are routed to a specific destination port via the destination MAC address or via the routing.

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