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# THOMAS-CONRAD CORPORATION
TC6842 (FOR THE MACINTOSH)
NIC Type ARCnet
Transfer Rate 2.5Mbps
Data Bus 32-Bit NuBus
Topology Star
Wiring Type RG62/U 93ohm coaxial
Boot ROM Not Available
IMG IMG 1
+------------------------------------------------------------+
| NODE ADDRESS |
|------------------------------------------------------------|
| Node |SW1/1 |SW1/2 |SW1/3 |SW1/4 |SW1/5 |SW1/6|SW1/7|SW1/8|
|-------+------+------+------+------+------+-----+-----+-----|
|» | 1 | Off | On | On | On | On | On | On | On |
|--+----+------+------+------+------+------+-----+-----+-----|
| | 0 | - | - | - | - | - | - | - | - |
|--+----+------+------+------+------+------+-----+-----+-----|
| | 2 | On | Off | On | On | On | On | On | On |
|--+----+------+------+------+------+------+-----+-----+-----|
| | 3 | Off | Off | On | On | On | On | On | On |
|--+----+------+------+------+------+------+-----+-----+-----|
| | 4 | On | On | Off | On | On | On | On | On |
|--+----+------+------+------+------+------+-----+-----+-----|
| |251 | Off | Off | On | Off | Off | Off | Off | Off |
|--+----+------+------+------+------+------+-----+-----+-----|
| |252 | On | On | Off | Off | Off | Off | Off | Off |
|--+----+------+------+------+------+------+-----+-----+-----|
| |253 | Off | On | Off | Off | Off | Off | Off | Off |
|--+----+------+------+------+------+------+-----+-----+-----|
| |254 | - | - | - | - | - | - | - | - |
|--+----+------+------+------+------+------+-----+-----+-----|
| |255 | - | - | - | - | - | - | - | - |
|------------------------------------------------------------|
| Note:Node address 0 is used for messaging between nodes |
| and must not be used. Node addresses 254 &255 are reserved|
| for AppleTalk network broadcast messages and also must not|
| be used. |
| |
| A total of 253 node address settings are available. The |
| switches are a binary representation of the decimal node |
| addresses. Switch 1 is the Least Significant Bit and |
| switch 8 is the Most Significant Bit. The switches have |
| the following decimal values: switch 1=1, 2=2, 3=4, 4=8, |
| 5=16, 6=32, 7=64, 8=128. Turn off the switches and add the|
| values of the off switches to obtain the correct node |
| address. (On=0, Off=1) |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CABLE LENGTH AND RESPONSE/RECONFIGURATION TIMEOUTS |
|------------------------------------------------------------|
| Cable | Response | Reconfiguration | JP1 | JP2 |
| Length | Time | | | |
|-------------+----------+-----------------+--------+--------|
| » | < | 74.7 m s | 840ms | Open | Open |
| | 20,000 | | | | |
| | feet | | | | |
|---+---------+----------+-----------------+--------+--------|
| | > | 283.4 m | 1680ms | Closed | Open |
| | 20,000 | s | | | |
| | feet | | | | |
|---+---------+----------+-----------------+--------+--------|
| | > | 561.8 m | 1680ms | Open | Closed |
| | 20,000 | s | | | |
| | feet | | | | |
|---+---------+----------+-----------------+--------+--------|
| | > | 1118.6 m | 1680ms | Closed | Closed |
| | 20,000 | s | | | |
| | feet | | | | |
|------------------------------------------------------------|
| Note: All NICs on the network must have this option set |
| the same. |
+------------------------------------------------------------+