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Analyzing a Faulty Cisco IAD2431-16FXS

I have a Cisco IAD2431-16FXS that has an issue with audio from the FXS mouth ports, sending only static, receive is fine Testing with a 600ohm Alcatel TE200 with REN of 1 over a 1000m coil FXS Loopback Tests Lopping the local disables network and I get amplified...

NetCommWireless NDD-0300 Teardown

Main Board DSL Controller? D1_DSL W8396L01? D1_FAST Le87281 – G.Fast Single Channel Line Driver https://www.microsemi.com/product-directory/g-fast/4139-le87285 U11 UART? J2 Main Controller Catalyst semi? Microsemi? S8383N23SLMD8 Ethernet Transformer U7 –...

Cisco Voice

https://www.cisco.com/c/en/us/support/docs/voice/voice-quality/30141-symptoms.html#anc14 https://www.cisco.com/c/en/us/support/docs/voice/digital-cas/14007-net-signal-control.html DSP Debuging...

Adtran Netvanta 838

  Built a custom patch cable with two 50 pin champ connectors (set for pairs 1 thur 8) and krone disconnect modules in the middle which allows you to manually busyout/fault a line using a small slice of plastic It could be used to tap into and out of the line using...