ocr: 2B+D channels Bit timing Frame timing Activation (Note 2); Deactivation (Note 2); Basic access ET digitai section Operation and maintenance (Note 2)1 Power feed (Note 1i 11107731-68 Vi reference point Note 1 - The provision of power feed function is optional. Note 2 - These functions are conveyed by the CV1 channel. FIGURE 2/Q.512 Functions at interface Vi
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