Related Documentation
Understanding Circuit Emulation PIC Types
The following Circuit Emulation PICs are specifically designed for mobile backhaul applications:
- 4-port Channelized OC3/STM1 Circuit Emulation PIC
- 12-port T1/E1 Circuit Emulation PIC
- 8-port OC3/STM1 or 12-port OC12/STM4 ATM MIC
The four-port Channelized OC3/STM1 Circuit Emulation PIC allows each of its four ports to be independently configured to either SONET or SDH framing mode, and supports mixed SAToP and ATM interfaces on any port. In SONET mode, each OC3 port can be channelized down to 3 coc1 channels, and then each coc1 can channel down to 28 T1 channels. In SDH mode, each STM1 port can be channelized down to 4 cau4 channels, and then each cau4 can channel down to 63 E1 channels. The T1/E1 channels support time-division multiplexing (TDM) interfaces using the Structure-Agnostic time-division multiplexing over Packet (SAToP) protocol [RFC 4553] encapsulation, and support T1/E1 and SONET clocking features. Mixing T1 and E1 channels is not supported on individual ports.
The 12-port Channelized T1/E1 Circuit Emulation PIC supports TDM interfaces using the SAToP protocol [RFC 4553] encapsulation, and supports T1/E1 and SONET clocking features. The 12-port Channelized T1/E1 Circuit Emulation PIC can be configured to work as either 12 T1s or 12 E1s. Mixing T1s and E1s is not supported.
The 8-port OC3/STM1 or 2-port OC12/STM4 Circuit Emulation ATM MIC supports both SONET and SDH framing mode. The mode can be set at the MIC level or at the port level. ATM MICs are rate-selectable at the following rates: 2-port OC12 or 8-port OC3. The ATM MIC supports ATM pseudowire encapsulation and swapping of VPI and VCI values in both directions.
 | Note: Cell-relay VPI/VCI swapping and cell-relay VPI swapping on both egress and ingress are not compatible with the ATM policing feature. |
