Andrew MAU 9228-DC 301-0154-01 8-Port Token Ring MAU 115V IBM Data Connector

Andrew MAU 9228-DC 301-0154-01 8-Port Token Ring MAU 115V IBM Data Connector

The Andrew MAU 9228-DC is an 8-port Token Ring Multi-Station Access Unit (MAU) manufactured by Andrew Network Products of Torrance, California. A MAU serves as the central wiring hub in a Token Ring network, providing the physical ring connection point for workstations and managing the token-passing protocol that gives Token Ring its name. This unit carries part number 301-0154-01, hardware revision Rev C, and was manufactured in September 1993.

Specifications & What's Included

• Brand: Andrew Network Products (Made in USA)
• Series: MAU
• Model: 9228-DC
• Part Number: 301-0154-01
• Hardware Revision: Rev C (Hardware Rev 4399)
• Date of Manufacture: 17 September 1993
• Station ports: 8 numbered ports (1–8) with IBM Data Connectors (IDC/UDC)
• Ring In (RI) and Ring Out (RO) ports for daisy-chaining multiple MAUs
• Per-port red indicator LEDs on front panel
• Power LED on front panel
• Power: 115V AC, 60Hz, 9W, fuse 0.5A
• Form factor: 1U rackmount
• Connector type: IBM Data Connector (hermaphroditic IDC/UDC)
• Unit only — no cables or documentation included

Applications

Token Ring was IBM's primary LAN technology from the mid-1980s through the mid-1990s, used extensively in corporate, banking, and government environments built around IBM mainframes, AS/400 systems, and PS/2 workstations. The MAU (also called an MSAU or simply a hub in Token Ring terminology) is the essential wiring center of any Token Ring installation — each workstation connects to a port on the MAU via shielded twisted-pair cable and IBM Data Connectors, and the MAU internally maintains the logical ring. Multiple MAUs can be cascaded using their RI and RO ports to expand the network. The Andrew 9228-DC supports 4 Mbps or 16 Mbps Token Ring (IEEE 802.5) topologies. By the late 1990s, Token Ring was largely displaced by switched Ethernet, but legacy Token Ring infrastructure continues to be maintained in some older IBM-centric environments, and MAUs like this one remain sought by organizations keeping those systems operational or by collectors of vintage networking equipment. The 9228-DC dates from the early-to-mid 1990s peak of Token Ring deployment.