Cisco Cisco 12000 Series 12-Port DS3 Line Card Hoja De Datos
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Data Sheet
Cisco XR 12000 and 12000 Series SPA Interface
Processors
Processors
The Cisco
®
Interface Flexibility (I-Flex) design combines shared port adapters (SPAs) and SPA interface
processors (SIPs) to help prioritize voice, video, and data services. Enterprise and service provider customers can
take advantage of improved slot economics resulting from modular port adapters that are interchangeable across
Cisco Systems
®
routing platforms. The extensible Cisco I-Flex design maximizes connectivity options and offers
superior service intelligence through programmable interface processors that deliver line-rate performance. Cisco
I-Flex enhances speed-to-service revenue and provides a rich set of quality-of-service (QoS) features for premium
service delivery while effectively reducing the overall cost of ownership. This data sheet contains the specifications
for the Cisco XR 12000 and 12000 Series SIPs (SIP 401, SIP 501, and SIP 601).
Figure 1.
Cisco XR 12000 and 12000 Series SIP with the 8XFE-TX, 5X1GE, 2XOC48-POS/RPR, and 1XCHSTM1/OC-3 SPAs
The Cisco XR 12000 and 12000 Series SIP provides:
●
A common forwarding and queuing engine responsible for packet classification, forwarding decisions,
packet queuing, and accounting without compromising the performance—Each SIP has two forwarding
engines, one for ingress and one for egress, allowing the user to implement multiple features and QoS
policies at the incoming traffic, independently from the features and the QoS policies applied at the egress
interfaces. The multicast replication is done by the egress forwarding engine, hence a very scalable
multicast implementation with a native and built-in security and QoS features for multicast flows.
●
A modular physical layer interface module (PLIM) front end with intelligent oversubscription that hosts up to
four SPAs—Each SPA has a dedicated interface (2.5 or 10 Gbps) to the SPA controller. A fair bandwidth
allocation algorithm shares available and excess bandwidth between the SPAs (the oversubscribed SPA
does not cause any packet drop on the nonoversubscribed SPA, and any unused bandwidth from one SPA
is used by the other SPA). The Cisco XR 12000 and 12000 Series SIP supports three types of SPAs:
interface-specific SPAs, service-specific SPAs, and multiservice SPAs.
◦
Interface-specific SPAs—Each of these SPAs is optimized for one media and one speed, providing a
dense solution ranging from OC-192/STM-64 down to T1/E1 and DS-0, 10-Mb Ethernet, 100-Mb Fast
Ethernet, 1 Gigabit, and 10 Gigabit Ethernet.