(i) Figure 2-17 shows the manual wire system at the MSB. The MSB wire system uses
the older SB-22. The SB-22 is a simple, rugged switchboard that has proven itself in combat to be a
reliable device. Two SB-22s one stacked on another) provide the capacity (29 circuits) to handle
subscriber demands.
Figure 2-17. MSB wire system
2-13
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