Cabletron MMAC-8FNB MultiMedia Access Center Chassis Ethernet Token Ring FDDI

Cabletron MMAC-8FNB MultiMedia Access Center Chassis Ethernet Token Ring FDDI

The Cabletron MMAC-8FNB is an 8-slot modular network hub chassis from Cabletron's MultiMedia Access Center (MMAC) line. As labeled on the unit itself, it supports Ethernet/IEEE 802.3, Token Ring, and FDDI networks, making it a multi-protocol chassis designed to accept a variety of Cabletron interface and management modules. This listing is for the chassis only — no modules are included.

Specifications & What's Included

• Model: Cabletron MMAC-8FNB
• Type: MultiMedia Access Center modular hub chassis
• Module slots: 8
• Supported network types: Ethernet/IEEE 802.3, Token Ring, FDDI
• Backplane: Full green multi-slot backplane with card-edge connectors for each slot
• Cooling: 3x internal cooling fans (bottom-mounted)
• Power: 10A, 250V (fuse/power rail visible on rear interior)
• Form factor: Standalone desktop/rackmount chassis
• Modules included: None — bare chassis only

Applications

The Cabletron MMAC (MultiMedia Access Center) line was a family of modular wiring hub chassis introduced by Cabletron Systems in the early-to-mid 1990s, aimed at enterprise and campus network installations. The chassis provided a common backplane into which a wide range of Cabletron plug-in modules could be installed — Ethernet, Token Ring, FDDI, ATM, and management modules — allowing a single chassis to serve as a multi-technology wiring center. This made the MMAC architecture popular in large organizations during the transition era from Token Ring and FDDI toward switched Ethernet, as it could support all three technologies simultaneously. Today, the MMAC-8FNB chassis is primarily sought by those maintaining or restoring legacy Cabletron network installations, or by collectors of late-1980s and 1990s enterprise networking equipment. Compatible Cabletron MMAC modules can frequently be sourced separately to populate the empty slots.