Cisco 7600 SIP 200 - SPA Interface Processor 200 Hardware Installation Manual page 71

Chapter 3 Overview: Cisco 7600 Series Router Shared Port Adapters
The 1-Port Channelized OC-12/STM-4 SPA interface is compliant with RFC 1619, PPP over
SONET/SDH, and RFC 1662, PPP in HDLC-like Framing. The 1-Port Channelized OC-12/STM-4 SPA
also provides support for SNMP v1 agent (RFC 1155–1157), and Management Information Base (MIB)
II (RFC 1213).
Note For Cisco IOS XR Software Release 3.8.0, the 1-Port Channelized STM-4/OC-12 SPA supports Frame
Relay Fragmentation (FRF.12) to achieve fragmentation of data packets and interleaving of voice
packets. FRF.12 provides a method to fragment low-priority packets and interleave high-priority packets
in between the low-priority fragments to provide less delay or jitter for high-priority traffic like voice
and video.
For Cisco IOS XR Software Release 3.8.0, the 1-Port Channelized STM-4/OC-12 SPA supports
Note
Multilink Fame Relay (MFR) feature. MFR provides a mechanism for aggregating multiple serial links
into a bundle to provide greater bandwidth, load balancing between links, and improved service
availability by protecting against single point link failures.
1-Port Channelized OC-12/STM-4 SPA Cables and Connectors
The 1-Port Channelized OC-12/STM-4 SPA uses a small form-factor pluggable (SFP) optical transceiver
module installed in each port for SONET and SDH single-mode and multimode optical fiber connection
(see
Figure 3-20
The SFP optical transceiver modules used with the 1-Port Channelized OC-12/STM-4 SPA provide the
following optical fiber options:
•
•
OL-5052-14
Figure 3-20).
SFP Optics Module
Multimode—622-Mbps, OC-12/STM-4 optical fiber (SONET STS-12 or SDH STM-4)
Use a multimode optical fiber that has a core/cladding diameter of 62.5/125 microns.
Single-mode—622-Mbps, OC-12/STM-4 optical fiber (SONET STS-12 or SDH STM-4)
Use a single-mode optical fiber that has a modal-field diameter of 8.7 ±0.5 microns. (Nominal
diameter is approximately 10/125 microns.)
Cisco 7600 Series Router SIP, SSC, and SPA Hardware Installation Guide
1-Port OC-12c/STM-4 ATM SPA Overview
3-25