Cisco Cisco ASR 1000 Series 40Gbps SPA Interface Processor Scheda Tecnica
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Data Sheet
Cisco Gigabit Synchronous Ethernet
Shared Port Adapter
Shared Port Adapter
The Cisco
®
Interface Flexibility (I-Flex) design combines shared port adapters (SPAs) and SPA interface
processors (SIPs), taking advantage of an extensible design that helps enable service prioritization for 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 routing platforms. The
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 2-Port Gigabit Synchronous
Ethernet Shared Port Adapter (Figure 1).
Figure 1. Cisco 2-Port Gigabit Synchronous Ethernet SPA
Product Overview
The Cisco 2-Port Gigabit Synchronous Ethernet SPA (SPA-2X1GE-SYNCE) is compatible with the Cisco 2-Port
GigE SPA-v2 (SPA-2X1GE-V2) in terms of the supported capabilities. The Cisco 2-Port Gigabit Synchronous
Ethernet SPA also provides additional services, such as time and frequency distribution across Ethernet networks
using the following technologies:
●
Synchronous Ethernet (SyncE): Defined by ITU-T standards such as G.8261, G.8262, G.8264, and
G.781, this technology uses the PHY Ethernet layer to transmit frequency to remote sites. SyncE provides
one-to-one parity with SONET/SDH networks for timing capability with the advantages of Ethernet
networks. In comparison to SONET/SDH, Ethernet networks are indifferent to timing; only network
elements and Ethernet interfaces along the synchronization path must support SyncE. According to the
SyncE requirements, exchange of QL (Quality Level) over Ethernet Synchronization Messaging Channel
(ESMC), as well as Synchronization Status Messages (SSMs) for SONET/SDH interfaces are supported.
●
IEEE Standard 1588-2008: This standard specifies a protocol known as Precision Time Protocol Version 2
(PTPv2), which is designed to provide precise timing and synchronization over packet-based
infrastructures. PTP uses packet communication to synchronize two IEEE 1588-2008 clocks.