The AC2560 TDM over Packet device implements Circuit Emulation Services Interworking Functions (CES IWF) for a fully channelized OC-3 or STM-1 capacity and 16 additional DS1/E1 TDM ports. Each of the DS1 or E1 channels are processed individually to provide a highdensity Gateway between TDM over SONET/SDH and TDM over packet.
The device integrates all functions for TDM transport gateway applications in wireless backhaul systems: SONET/SDH line interface with 1+1 APS protection, VT-1.5/VC-12 mappers, E1/DS1 framers, TDMoP IWF, and packet header processing.
The AC2560 implements the SAToP and CESoPSN modes defined by IETF, MEF, MFA and ITU. These support transport of transparent DS1/E1 channels, or provide bandwidth efficient nx64 fractional channels.
Each TDM channel can be configured independently for adaptive, differential or retiming clock recovery mode, and each channel may operate at a different clock rate.
The integrated DS1/E1 framers enable fault and performance monitoring, including test pattern insertion and loopback. The device supports Ethernet, VLAN, IP and MPLS PWE3 packet headers, and a dual Gigabit Ethernet interface.
The device is ideally prepared for new protocols or standards evolution due to its FPGA based design.
Evaluation systems are available for system level testing.
- TDM over Packet CES IWF for 84+16 DS1s, 63+16 E1s
- SAToP or CESoPSN transport mode selectable per channel (RFC4553 and RFC5086)
- Configurable amount of TDM data per packet
- Clock recovery mode selectable per channel: adaptive, differential or retiming mode
- RTP header for differential clock (RFC3550)
- Jitter and wander compliant to MEF18, ITU-T G.8261 and G.823 / G.824 for traffic interfaces
- Configurable jitter buffer size
- Extensive set of CES fault and performance monitoring points
- The integrated SONET/SDH framer/mapper supports SOH/POH, pointer processors, and VT-1.5/VC-12 mappers
- DS1/E1 framers provide alarm, fault and performance monitoring, and support for loopbacks and PRBS maintenance functionality
- Integrated packet header processor for MAC addresses, VLAN tags, IP and MPLS PWE3 headers
- 2 OC-3/STM-1 line interfaces
- 16 TDM interfaces to LIU at 1.544 or 2.048 Mb/s
- Dual GbE SerDes or interface to external PHY
- Clock: 19.44 MHz
- DDR2 DRAM for jitter buffer
- 16-bit CPU interface
- High density TDM over packet equipment
- Aggregation or gateway card Carrier-Class Ethernet Switch or IP/MPLS router
- RNC or BSC controller network interface card
- CMTS cable head-end
- AMC I/O cards for ATCA and MicroTCA
Block Diagram of the TDM over Packet Gateway device