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G.703 is a ITU-T standard for transmitting voice or data over digital carriers such as T1 and E1. G.703 provides the specifications for pulse code modulation (PCM). G.703 also specifies E0 (64kbit/s). For information about E0 audio see G.711. G.703 is typically transported over balanced 120 ohm twisted pair cables terminated in RJ45 jacks. However, some telephone companies use unbalanced (dual 75 ohm coax) wires also allowed by G.703.
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