Analog network, Digital line/net, Analog network -3 digital line/net -3 – ADTRAN MX2800 M13 User Manual
Page 109: Figure 6-3. tributary loopback test -3, Figure 6-3, For an il, An analog network, Figure 6-3. tributary loopback test, Figure 6-4. analog network loopback, Figure 6-5. digital line/network loopback
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