CABLETRON SYSTEMS, INC.
TRFOT-2, TRFOT-3
Device Type | Fiber Optic Transceiver |
NIC Type | Token Ring |
Maximum Onboard Memory | Unidentified |
Boot ROM | Not available |
Network Transfer Rate | 4/16Mbps |
Topology | Star |
Wiring Type | Unshielded twisted pair (10Base-T) Fiber optic |
Data Bus | External |

CONNECTIONS | |||
Function | Label | Function | Label |
Power jack | CN1 | Fiber optic connector (ST) - receive | RX |
AUI transceiver via DB-9 | CN2 | Fiber optic connector (ST) - transmit | TX |
USER CONFIGURABLE SETTINGS | ||
Function | Label | Position |
Phantom drive disabled | SW1/C | On |
Phantom drive enabled | SW1/C | Off |
Cabletron proprietary devices | SW1/D | On |
802.5J compatible devices | SW1/D | Off |
Note: SW1/C & SW1/D apply to RI/RO applications | ||
APPLICATION SETTINGS | ||||
Setting | SW1/A | SW1/B | SW1/C | SW1/D |
Station application enabled | On | Off | Off | Off |
Lobe (TCU) application enabled | Off | Off | Off | Off |
Ring in application enabled | On | On | See note | See note |
Ring out application enabled | Off | On | See note | See note |
Note: SW1/C & SW1/D may be in either position as illustrated in the user configuration table | ||||
DIAGNOSTIC LED(S) | |||
LED | Color | Status | Condition |
PWR | Green | On | Power is on |
PWR | Green | Off | Power is off |
CU | Green | On | Phantom detected/valid copper link |
CU | Green | Blinking | Phantom detected/valid copper link, no data present |
CU | Red | On | Phantom not detected. No copper link |
FO | Green | On | Fiber optic link is good |
FO | Red | On | Fiber optic link is broken |