DECmau 900TL INSTALLATION LKG–8137-93I DEChub ONE MAU 900TL DECmau 900TL PK–02580–IL The DECmau 900TL is a Token Ring Multistation Access Unit (MAU). As a member of Digital’s Token Ring product family, it operates in a DEChub 900 MultiSwitch, or a single-slot hub (DEChub ONE MAU 900TL). The MAU connects up to eight stations using 100-ohm shielded or unshielded cable with RJ45 connectors, and 150-ohm IBM Type 1 data cable using an impedence matching transformer cable.
Copyright EK–DTMAU–IN. A01 July, 1993 The information in this document is subject to change without notice and should not be construed as a commitment by Digital Equipment Corporation. Digital Equipment Corporation assumes no responsibility for any errors that may appear in this document. Copyright 1993 by Digital Equipment Corporation All Rights Reserved. Printed in U.S.A.
Front Panel 1 2 1 ) Power LED. Lights when the MAU has power. 2 ) Module OK LED. Lights when the MAU passes its self-test. If the MAU fails its self-test, the OK LED is off. 3 4 3 ) Ring A/B LEDs. In a hub, either the A LED or the B LED is on to show the ring. In a standalone MAU, both Ring LEDs are always off. 5 4 ) Speed LEDs. Either the 16 LED or the 4 LED is on to show the ring speed. 5 ) Eight Lobe LEDs. Lights when a station has access to the network. 6 ) Eight Lobe Connectors.
Rear Panel of DEChub ONE MAU 900TL Note: The rear panel shown here is used only when the MAU is in a single-slot hub configuration. 1 1 ) Ring In LED. Lights with a Ring In connection. 2 2 ) Ring Out LED. Lights with a Ring Out connection. 3 3) Power Connector. Provides power connection for the MAU. 4 ) Ring In Connector. Connects Ring In to the Ring Out connector of a MAU or repeater. 4 5 6 7 8 5 ) Ring In Autowrap Switch.
Installing a MAU in a DEChub 900 MultiSwitch When you install a MAU in a DEChub 900 MultiSwitch, you do not have to turn off the hub power. 1 Remove the single-slot hub (if necessary). If you want to install a DEChub ONE MAU 900TL in a hub, you need to remove the single-slot hub. a. Loosen the screw on the single-slot hub until it disengages. b. With one hand holding the front of the MAU, and your other hand holding the single-slot hub, carefully pull the two units apart. 2 a.
Installing a MAU in a DEChub 900 MultiSwitch (continued) 3 Verify power. With power on in the hub, verify that the Power and Module OK LEDs are on. LKG–8141-93I 4 Connect station cables. Connect station cables to any available lobe connector on the MAU. For 150-ohm applications, you also need an impedence matching transformer cable (Digital part number BN26T-03). Module installation for a DEChub 900 MultiSwitch is complete.
Installing a DEChub ONE MAU 900TL 1 Mount MAU (optional). You can place the MAU on a table, mount it on a wall, or mount it in a standard 19-inch rack using a shelf assembly, Digital part number H9544-MS. For a wall mounting, position two screws 19.7 centimeters (7.75 inches) apart on the wall. Turn screws until tight and then back off two turns. Hang the MAU using the keyholes. 2 Set Autowrap switches. a. Set the Ring In and the Ring Out Autowrap switches to 1 or 0. b.
Installing a DEChub ONE MAU 900TL (continued) 4 Connect station cables. Connect station cables to any available lobe connector on the MAU. For 150-ohm applications, you also need an impedence matching transformer cable (Digital part number BN26T-03). 5 Install a MAU to adjacent MAUs or repeaters. If a MAU is being added to an existing network, connect Ring In to the Ring Out connector of a MAU or repeater, and connect Ring Out to the Ring In connector of a MAU or repeater. 6 Check LEDs.
Removing a MAU from a DEChub 900 MultiSwitch 1 2 Disconnect the station connector cables from the MAU. Remove the MAU from the hub. Note: When you remove a MAU from the hub, do not turn off the hub power. The release lever is lifted and clicks back into place as the module is removed. a. Lift up the Release lever on the hub. b. Pivot the MAU back on its bottom mounting tab until it disengages from the hub.
LED Summary The LEDs indicate status by being on, off, and flashing. Flashing LEDs indicate special situations. There are two flashing patterns and a scroll pattern. When an LED indicates a continuous single-flash pattern, network management has disabled the port. A continuous double-flash pattern indicates the wrong speed. In a scroll pattern, the LEDs turn on and off in a set order.
Cabling Table 1 lists the Token Ring industry guideline for the maximum lobe length of shielded twisted-pair (STP) and unshielded twisted-pair (UTP) cable. Table 1 Industry Lobe Length Guideline UTP STP Speed Level 3 Level 5 4 Mb/s 100 m (327 ft) 100 m (327 ft) 100 m (327 ft) 16 Mb/s 65 m (213 ft) 100 m (327 ft) 100 m (327 ft) Lobe lengths for Digital’s MAUs exceed the industry guideline.
Cabling (continued) Digital recommends that you use repeaters to segment the ring in a network with multiple wiring closets. In some situations, only one, or no repeaters, are required. Refer to the appropriate Token Ring repeater manual for specific information. When distances exceed the lobe lengths in Table 2, or if the MAU does not have Digital’s Autowrap functionality, two repeaters are required.
Problem Solving If ... Then ... Do This ... DEChub 900 MultiSwitch and DEChub ONE Power LED is off. MAU does not have power. Verify that outlet has power. Check power connection to MAU. Replace power supply. Replace MAU. Module OK LED is off. MAU failed self-test. Replace MAU. Ring A and B LEDs alternately MAU needs an upgrade flash. or an upgrade is in progress. If you have network management, do a downline load; otherwise, replace MAU. Wait for upgrade to complete. Both Speed LEDs are off.
Problem Solving (continued) If ... Then ... Do This ... DEChub 900 MultiSwitch ONLY Lobe, Ring In, Ring Out, Ring A/B LEDs flash together. Network management has disabled MAU. To change settings, you can use network management commands or the MAU’s Reset switch. MAU does not connect to hub. Network management will not connect MAU to hub. Check speed and hub settings for incorrect network management overrides. MAU does not work in DEChub 90. DEChub 90 only supports Ethernet networks.
Product Specifications Product Specification In a Hub DEChub ONE Size 27.3 x 11.2 x 3.2 cm (10.8 x 4.4 x 1.2 inches) 27.3 x 17.0 x 3.2 cm (10.75 x 6.7 x 1.25 inches) Weight .82kg (1.5 lb) 1.09kg (2.
