3-33
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Hardware Installation Guide
OL-14126-12
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
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.
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.
Table 3-21 Interface Specification for 2-Port Gigabit Synchronous Ethernet SPA
SPA-XXXXXXXXXXX
A/L
A/L
STATUS
0
1
279144
Specification Description
Synchronous Ethernet support Yes
Interface Type and Density 2x1 GE
Local Timing Interfaces Input; Output
Local Timing Frequency 1.544 MHz / 2.048 MHz
BITS Interface Support In; Out
SSM Support Yes
To Next Page
Loading...
