8226 Token Ring RJ45 Connection / Model 001

Product Description
The 8226 is a low-cost, passive token ring access unit that provides RJ45 connection for attaching workstations and other token ring devices to a 4 or 16 Mbps token ring network using Category 4 or 5 (unshielded twisted pair) UTP cabling.


LED Explanation:

LED State Explanation
1 - 8 On An active device is connected to the RJ45 port.
(Green) ---------------------------------------------------------------
Off No active device is connected to the RJ45 port.
Power ON The 8226 receive power from an electrical outlet
(Green) ---------------------------------------------------------------
Off The 8226 is not connected to an electrical outlet
or there is a problem with the power cord or power
Concentrator/Splitter Allows to use the 8226 as a splitter when attached
mode switch to another 8226, or as a concentrator.

Some about Cable length
In general, as the main ring path grows longer, the maximum length of the longest lobe (the cable from the 8226 to an attaching device) decreases. Although rings that violate these rules may work satisfactorily, when a problem does occur, recovering the network according to the procedures in the manual IBM Token Ring Network Problem Determination Guide  may not be possible. In order to determine whether or not the segment meets the guidelines, you should use the formula :

(sum of MPR cables - shortest MPR cable) + LLL

should be <= 145 meter (478 feet) for 4 Mbps

- or -

should be <= 290 meter (957 feet) for 16 Mbps

MPR = Main Ring Path LLL = Longest Lobe Length

If the ring has e.g. three 8226s connected with cables of 40 m (132 ft), 60 m, (165 ft) and 80 m (264 ft) with a longest lobe length of 50 m (165 ft), distance of 95 m (313 ft), it falls within the guidelines.
However, if these distances where all doubled, the transmission distance would be 190 m (627 ft), clearly in violation of the maximum distance guidelines.

See -> Copper Wire / Gauge

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