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When ports 17 and 18 are configured as RI/RO ports, they are fully compliant
with the IEEE 802.5C (dual-ring recovery) standard.
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Support for installation of one T-MAC.
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Support for installation of one Jitter Attenuator daughter card.
Figure 108. Front View of 18-Port Active Per-Port Switching Module
Figure 108 shows the front view of the 18-port active per-port switching module.
As can be seen, this module provides LED Indicators on the front panel that
allow you to monitor the status of the module and the individual ports. Table 28
on page 176 describes the meaning of these LEDs:
Chapter 9. 8260 Token-Ring Modules 175