Motorola 68230 - Vanguard 300 DSU/CSU Operator's Manual page 15

Example of the Vanguard 300 Back Panel
The Vanguard 300 back panel features the following connectors, as shown in
Figure 1-4.
Example of the Vanguard 305 Back Panel
The Vanguard 305 back panel features the following connectors, as shown in
Figure 1-5.
Figure 1-4. Vanguard 300 Back Panel
Figure 1-5. Va nguard 305 Back Panel