SMSC TMC2005-JT - Manual (Page 13)

ARCNET 5 Port HUB Controller
Datasheet
SMSC TMC2005-JT Page 13 Revision 1.1 (07-24-07)
DATASHEET
Example 2: A five ports HUB with HYC9088s and a optical transceiver(TODX270A) links the two physical layers;
dipulse and fiber optics.
FIGURE 2 - APPLICATION EXAMPLE 2
Only the TMC2005 and five transceivers are indicated in the above figure. Connect the other pins adequately.