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# TDMoE - Time Division Multiplexing over Ethernet
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This protocol was originally created by Mark Spencer in [Digium, Inc](http://www.digium.com/) for enabling Asterisk users to use TDM protocols over inexpensive hardware (Ethernet Hardware).
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## Protocols
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This protocol is a container for 'all' TDM based telephony-protocols. Unfortunatly, the TDMoE protocol does not contain information about what protocol(s) it transmits, so to further decode the data stream, you need to know exactly the configuration of the transmitting party.
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Inside the TDM stream you can have a number of different configurations of framing systems, coding systems and protocols such as the ones contained inside the BRI, PRI or [SS7](/SS7) signalling specifications.
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## Example traffic
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Screen shot of a TDMoE frame from file: [tdmoe.cap](uploads/__moin_import__/attachments/TDMoE/tdmoe.cap)
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![tdmoe.png](uploads/__moin_import__/attachments/TDMoE/tdmoe.png "tdmoe.png")
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## Example capture file
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[tdmoe.cap](uploads/__moin_import__/attachments/TDMoE/tdmoe.cap) A simple TDMoE capture (TDMoE/CAS/MFCR2)
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## Display Filter
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A complete list of TDMoE display filter fields can be found in the [display filter reference](http://www.wireshark.org/docs/dfref/t/tdmoe.html)
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Show only the TDMoE traffic:
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tmdoe
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## External links
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- [Info about Asterisk's TDMoE support](http://www.voip-info.org/wiki/view/Asterisk%2BTDMoE)
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- [Wikipedia article about TDM](http://en.wikipedia.org/wiki/Time-division_multiplexing)
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## Discussion
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---
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Imported from https://wiki.wireshark.org/TDMoE on 2020-08-11 23:26:33 UTC |