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Features
Despite the name, SONET is not limited to optical links. Electrical specifications have been defined for
CATV 75-ohm coaxial cable. Transmission rates are integer multiples of 51.840 Mbps, which can be
used to carry T3/E3 bit-synchronous signals.
The following transmission multiples are currently specified and commonly used:
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The following references discuss concepts and specifications of POS and PPP:
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Features
The OC12 POS line card has the following features:
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Interface Specifications
The physical layer interface for the OC12 POS line card is Optical Carrier-12 (OC-12c, the specification
for SONET STS-12c and SDH STM-4 transmission rates), and the OC12 POS line card is designed to
comply with Packet-over-SONET specifications. The OC12 POS line card provides a single
622.080-Mbps Packet OC-12 network interface for all supported platforms.
OC12 Packet Over SONET Line Card Installation and Configuration
1-4
STS-3c—155.520 Mbps
STS-12c—622.080 Mbps (the OC12 POS line card conforms to STS-12c)
STS-48c—2.488 Gbps
Simpson, W., Editor, The Point-to-Point Protocol (PPP), RFC 1512, Daydreamer, December 1993.
Simpson, W., Editor, PPP in HDLC Framing, RFC 1662, Daydreamer, July 1994.
Simpson, W., Editor, PPP Over SONET/SDH, RFC 1619, Daydreamer, May 1995.
American National Standard for Telecommunications - Digital Hierarchy - Optical Interface Rates
and Formats Specification, ANSI T1.105-1991.
American National Standard for Telecommunications - Synchronous Optical Network (SONET)
Payload Mappings, ANSI T1.105.02-1993 draft.
ITU-T Recommendation G.707, Synchronous Digital Hierarchy Bit Rates, June 1992.
Telecordia GR-253-CORE SONET: Common generic criteria, September 2000.
Short-reach (7300-1OC12POS-MM and 7300-2OC12POS-MM), intermediate-reach
(7300-1OC12POS-SMI and 7300-2OC12POS-SMI), and long-reach (7300-1OC12POS-SML and
7300-2OC12POS-SML) optical interface with single-mode optical fiber
For information on the type of cables to use with the OC12 POS line card, see the
Note
POS Line Card Optical Fiber Specifications" section on page
Connectors" section on page
Online insertion and removal (OIR) in the Cisco 7304 router, allowing you to remove, add, or
replace an OC12 POS line card online
Support for 16-bit and 32-bit cyclic redundancy checking (CRC-16 and CRC-32)
Support for Synchronous Payload Envelope (SPE) scrambling
Supports HDLC encapsulation
1-8.
Chapter 1
Overview
"OC12
1-5, and the
"Cables and
OL-3437-01
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