WAN Connector and Cables 173

56/64K CSU/DSU To connect a model 45x or model 55x bridge/router to a data digital Cable service (DDS), use a cable with an RJ-48S connector. 3Com supplies this

cable.

Figure 27 shows the pin assignments of the cable with both ends terminated in RJ-48S connectors.

Figure 27 CSU/DSU Cable

To WAN port

1 2 3 4 5 6 7 8

RJ-48S male (shielded)

To wall outlet

1 2 3 4 5 6 7 8

RJ-48S male (shielded)

Name

Abbr.

Pin

Transmit ring to network

R1

1

Transmit tip to network

T1

2

Not connected

NC

3

Not connected

NC

4

Not connected

NC

5

Not connected

NC

6

Receive tip from network

T

7

Receive ring from network

R

8

 

 

 

Pin Abbr. Name

1R1 Transmit ring to network

2T1 Transmit tip to network

3

NC

Not connected

4

NC

Not connected

5

NC

Not connected

6

NC

Not connected

7T Receive tip from network

8R Receive ring from network

Page 173
Image 173
3Com NETBuilder SI, SuperStack II manual CSU/DSU Cable