Community dial office

A "Community Dial Office" (CDO) was a small Class 5 telephone exchange in a rural area.

These most often provided capacity for 1000 or fewer customers and were designed for unattended operation. CDOs could be step by step, all relay or crossbar. Many offices provided four-digit local dialling to small rural communities where a call outside the local exchange was long distance.

单词	Community Dial Office
释义	Community Dial Office 英语百科 Community dial office A "Community Dial Office" (CDO) was a small Class 5 telephone exchange in a rural area. These most often provided capacity for 1000 or fewer customers and were designed for unattended operation. CDOs could be step by step, all relay or crossbar. Many offices provided four-digit local dialling to small rural communities where a call outside the local exchange was long distance.
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