IBM Nways 8260 Manual page 203

passive module refer to 8.9.4, "Beacon Recovery on the Module Switching
Modules" on page 158.
Support for address-to-port mapping using the Recovery ASIC.
Support for fan-out devices and splitters for attaching up to 8 stations to each
port. Note that fan-out device or splitter is required to provide a phantom
signal; therefore, an 8228 cannot be used as the fan-out device with this
module.
Support for connection of MAC-less stations (such as token-ring tracing
tools).
Software-based speed detection so that only the stations with the correct
ring speed settings can attach to the network. Note that the speed detection
implemented on the passive module may be enabled or disabled by the
user.
Support for 4 or 16 Mbps token-ring networks.
Support for installation of one T-MAC.
Built-in Jitter Attenuator daughter card.
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Chapter 9. 8260 Token-Ring Modules