Axerra Networks

› 2G BTS Backhaul over Ethernet or IP


Recent studies show that 40%-50% of the Operational Expenses (OpEx) incurred by mobile wireless operators are associated with the costs of 2G BTS T1/E1 leased lines for the backhaul of traffic in the Radio Access Network (RAN). The cost-effectiveness of Ethernet transport enables new opportunities for mobile wireless operators to reduce the recurring costs of TDM T1/E1 leased lines by enabling the backhaul of BTS T1/E1 circuits over low-cost Ethernet or IP transport networks while positioning the RAN for 3G All-IP.


Axerra’s AXN1, AXN10, and AXN100 Pseudo-Wire Gateways and Access Devices™, deployed at the BTS cell sites, aggregate and backhaul T1/E1 circuits to the BSC site using TDM pseudo-wire encapsulation known as Circuit Emulation Pseudo-Wire (CE-PW). Axerra’s AXN1600 or AXN800 carrier-class Pseudo-Wire gateways deployed at the BSC site, aggregate, terminate, and groom multiple CE-PWs into high-speed TDM links for cost-effective integration with the BSC.

The Ethernet transport can be available by Carrier Ethernet, cable HFC, or cost-effective Ethernet radio. High-accuracy clock synchronization, required for proper operation of the BTS, is transferred across the Ethernet network utilizing Axerra’s RTP-based High-Precision Clock Recovery (HPCR™) mechanism. HPCR is compliant with G.823/G.824 and maintains ±16 ppb FFoFF accuracy for both Maximum Relative Time Interval Error (MRTIE) traffic interface as well as Maximum Time Interval Error (MTIE) synchronization interface.

Benefits for Service Providers

  • Reduces OpEx associated with TDM leased lines while protecting 2G investments and positioning the RAN for 3G All-IP
  • Enables more bandwidth at lower cost to support new high-speed data services while also decreasing dependency on costly T1/E1s from incumbent carriers
  • Ensures cellular network performance through Axerra’s HPCR, the industry most robust and accurate clock recovery over packet mechanism and low end-to-end delay
AN-GSM BTS Backhaul  AN-GSM BTS Backhaul
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