Cisco ASR1004-10G/K9 Hardware Installation Guide - Page 75
-Port Gigabit Synchronous Ethernet SPA Interface Specifications,
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Chapter 3 Overview: Cisco ASR 1000 Series Aggregation Services Routers SPAs 2-Port Gigabit Synchronous Ethernet SPA Overview Figure 3-20 2-Port Gigabit Ethernet Synchronous Ethernet SPA Faceplate A/L 0 A/L 1 SPA-XXXXXXXXXXX STATUS 279144 2-Port Gigabit Synchronous Ethernet SPA Interface Specifications The 2-Port Gigabit Synchronous Ethernet SPA is compatible with the 2-Port Gigabit Ethernet SPA on all platforms and provides additional services of clock frequency and time of day synchronization. The2-Port Gigabit Synchronous Ethernet SPA uses new technologies such as Synchronous Ethernet (SyncE), ESMC, and IEEE1588v2. However, the 2-Port Gigabit Synchronous Ethernet SPA supports only optical interfaces. As a result the 2-Port Gigabit Synchronous Ethernet SPA does not support multiple line speeds (10/100/1000 Mbps) on the 2-Port Gigabit Ethernet SPA. Synchronous Ethernet is a layer 1 technology which delivers a very accurate frequency reference, but it doesn't address time synchronization. IEEE1588v2 defines a Precision Time Protocol (PTP), which distributes accurate timing information (both clock frequency and time of day) over packet networks. 2-Port Gigabit Synchronous Ethernet SPA hardware supports IEEE1588v2, either as a client or server. The 2-Port Gigabit Synchronous Ethernet SPA has these hardware capabilities to support the 1588v2 protocol stack: • Classification and forwarding of 1588v2 protocol packets. • Hardware time stamping. Table 3-21 Note The 2-Port Gigabit Synchronous Ethernet SPA hardware is the same for all configurations of the product. Table 3-21 describes key interface specifications on the 2-Port Gigabit Synchronous Ethernet SPA. Interface Specification for 2-Port Gigabit Synchronous Ethernet SPA Specification Synchronous Ethernet support Interface Type and Density Local Timing Interfaces Local Timing Frequency BITS Interface Support SSM Support Description Yes 2x1 GE Input; Output 1.544 MHz / 2.048 MHz In; Out Yes OL-14126-12 Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Hardware Installation Guide 3-33