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TC6842 (FOR THE MACINTOSH)

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

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 Length

Response Time

Reconfiguration

JP1

JP2

< 20,000 feet

74.7 m s

840ms

Open

Open

 

> 20,000 feet

283.4 m s

1680ms

Closed

Open

 

> 20,000 feet

561.8 m s

1680ms

Open

Closed

 

> 20,000 feet

1118.6 m s

1680ms

Closed

Closed

Note: All NICs on the network must have this option set the same.