Voice Circuit Emulation (TDM over ATM)

In this case CPE is responsible for extracting the live channels from E1 from the PBX, and switching them onto a circuit emulation over ATM, or if this is full, onto another E1 to the local phone company.

This arrangement allows surplus telephony traffic to be routed via the local phone carrier, and allows for failover to the public carrier in the event of a leased line outage.

The voice channels over ATM are carried using AAL1 on a PVC. This provides for a stable timing environment, and very low latency. 8el’s experience indicates the IAP can deliver the voice channels (uncompressed) from the PBX to the national PSTN with a latency of around 3 milliseconds, well below the threshold that would require any form of echo cancellation.

To discuss your communication requirements, please call 0845 33 000 93. Alternatively, send an email to [email protected]