Connecting External Devices to VME Option Boards4-33014–001867Connecting a VTRC Controller to aToken Ring LANA token ring local area network (LAN) can incorporate several devices thatcommunicate over a common system of cable and Trunk Access Units (TAUs). (Somenetworks refer to their access units as Media Access Units, or MAUs.) This sectiondescribes how to connect the first cable between your computer’s VTRC controllerand a token ring LAN.NOTE: For information on setting up the cables and TAUs on your token ringLAN, refer to DG/Token Ring Local Area Network Installation Guide.Figure 4–40 shows the location of the token ring connector on a VTRC boardinstalled in a deskside system.Deskside AViiON computer – rear viewVTRC connector (female)Figure 4–40 VTRC LAN ConnectorA lobe cable from the VTRC connector at the rear of your computer to a trunk accessunit attaches the controller to a token ring LAN. The lobe may consist of a singlecable connecting directly, or a series of cables which indirectly connect the VTRC toa TAU.Shielded twisted pair lobe cables have a 9-pin D connector on one end, and anIEEE 802.5 compliant data connector on the other. Indirect connections often useunshielded telephone cable with an RJ11 connector that can attach to a wall outletor data connector. Unshielded twisted pair cables include a filter on the 9-pinconnector end to diminish electronic emissions that might impair data transmission.Refer to DG/Token Ring Local Area Network Installation Guide for a detailedexplanation of LAN cabling.
