Supported Ethernet Spas; 2-Port Gigabit Synchronous Ethernet Spa; Spa Architecture; Path Of A Packet In The Ingress Direction - Cisco ASR 1000 Configuration Manual
Aggregation services routers sip and spa software
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Chapter 9
Overview of the Ethernet SPAs
Supported Ethernet SPAs
This section lists and describes the Ethernet SPAs supported by the Cisco ASR 1000 Series Routers and
the SIP line cards supporting these Ethernet SPAs.
2-Port Gigabit Synchronous Ethernet SPA
The 2-Port Gigabit Synchronous Ethernet SPA provides time and frequency distribution across Ethernet
networks. Synchronization is not traditionally present in the all-packet networks. Synchronization is
cost-effective, and especially important to service providers that migrated late to packet networks, and
use an external time-division multiplexing (TDM) circuit to provide timing to remote networks. These
remote networks constantly require synchronization for crucial voice services.
SPA-2X1GE-SYNCE also has the ability to interface with either an external SSU or BITS interface or a
GPS timing interface. The 2-Port Gigabit Synchronous Ethernet SPA comprises these clock interfaces:
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The 2-Port Gigabit Synchronous Ethernet SPA (SPA-2X1GE-SYNCE) is compatible with the 2-Port
GigE SPA-v2, and provides additional services, such as clock frequency and time-of-day
synchronization, using the following technologies:
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SyncE defined by ITU-T standards, such as G.8261, G.8262, G.8264, and G.781,and leverages the PHY
layer of Ethernet to transmit frequency to remote sites. SyncE provides a cost-effective alternative to the
SONET networks. For SyncE to work, each network element must along with the synchronization path,
support SyncE.
SPA Architecture
This section provides an overview of the architecture of the Gigabit Ethernet SPAs and describes the path
of a packet in the ingress and egress directions. Some of these areas of the architecture are referenced in
the SPA software and can be helpful to understand when troubleshooting or interpreting some of the SPA
CLI and show command output.
Every incoming and outgoing packet on the Gigabit Ethernet SPAs goes through the physical (PHY) SFP
optics, the Media Access Controller (MAC), and a Layer 2 Filtering/Accounting ASIC.
Path of a Packet in the Ingress Direction
The following steps describe the path of an ingress packet through the Gigabit Ethernet SPAs:
1.
OL-14127-08
BITS In
BITS Out
GPS In
GPS Out
Synchronous Ethernet (SyncE)
ESMC
For one-Gigabit Ethernet SPAs, the SFP optics receive incoming frames on a per-port basis from one
of the optical fiber interface connectors.
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide
Supported Ethernet SPAs
9-7
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Troubleshooting
