The four-port OC-3c/STM-1c ATM line card expands the connectivity options for the Cisco 12000 series Internet routers so that service providers can attach the Cisco 12000 series router directly to their existing ATM infrastructure. This allows Internet service providers (ISPs) to offer wire-speed Internet access via ATM virtual circuits (VCs). The new line card performs the segmentation and reassembly (SAR) of IP packets in accordance with RFC 1483, Multiprotocol Encapsulation over ATM Adaptation Layer 5 (AAL5).
The Cisco 12000 series ATM line cards enable the integration of legacy ATM networks with next-generation IP backbones in a multitude of ways. The following applications provide several examples of how the ATM line cards for the Cisco 12000 series will be used by service providers to build tomorrow's Internet.
Figure 1 ATM Network for WAN Services
Figure 2 ATM Network for POP Interconnection
Figure 3 ATM Network for DSL Aggregation
- OC-3 line-rate forwarding on all four ports for packet sizes greater than 280 bytes
- Cisco Express Forwarding (CEF) table that can accommodate up to 1 MB of forwarding entries
- Interleaved IP Version 4 (IPv4) and Multiprotocol Label Switching (MPLS) (Tag Switching) packets
- IP and MPLS load balancing on up to six paths
- Committed Access Rate (CAR)
- Access control lists (ACLs) and extended access control lists (EACLs)
- Maximum transfer unit (MTU) of 9188 bytes
- Hardware-assisted IP multicast
- 64 MB of route table memory, expandable to 256 MB
- 128 MB of packet buffer memory, expandable to 256 MB
- Packet/byte count, Synchronous Optical Network/Synchronous Digital Hierarchy (SONET/SDH) errors, queue size, and statistics without performance degradation (per port)
- Unspecified bit rate (UBR) transport over ATM AAL5
- RFC 1577 Classical IP over ATM
- RFC 1483 Multiprotocol Encapsulation over AAL5
- User-Network Interface (UNI) 3.0 and 3.1 (including Integrated Local Management Interface [ILMI] support)
- F5 Operation, Administration, and Maintenance (OAM) cell processing
- Support for up to 2048 VCs per port
- Non-real-time variable bit rate (Nrt-VBR) VC-level traffic shaping on up to 4 VCs per port, 16 per line card
- Virtual path (VP)-level traffic shaping
|Product Number||Output Optical Power||Input Optical Power||Maximum Distance|
* All multimode cards on the Cisco 12000 series use 1300-nm optics. Other products may use 850-nm optics for multimode. The specified maximum distance is valid only when the multimode card on the Cisco 12000 series is connected to another multimode card that uses 1300-nm optics.
|Product Model Number||Product Description||Availability||Cisco IOS® Release|
|MEM-GRP/LC-128 or MEM-GRP/LC-256|
* The four-port OC-3/STM-1 ATM LC was introduced in the Cisco IOS Version 11.2(14)GS, but not all features indicated in this data sheet were supported at that point. For full functionality, Version 12.0(10)S is recommended.
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