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OC12 Packet Over SONET Line Card Installation and Configuration

OL-3437-01

Chapter1 Overview

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:

• STS-3c—155.520 Mbps

• STS-12c—622.080 Mbps (the OC12 POS line card conforms to STS-12c)

• STS-48c—2.488 Gbps

The following references discuss concepts and specifications of POS and PPP:

• 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.

Features

The OC12 POS line card has the following features:

• 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

Note For information on the type of cables to use with the OC12 POS line card, see the “OC12

POS Line Card Optical Fiber Specifications” section on page 1-5, and the “Cables and

Connectors” section on page 1-8.

• 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

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.

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