Cisco Cisco IOS Software Release 12.2(27)SBC

CPE—customer premises equipment. Terminating equipment, such as terminals, telephones, and 
modems, supplied by the service provider, installed at customer sites, and connected to the network. 

DSLAM—digital subscriber line access multiplexer. A device that connects many digital subscriber 
lines to a network by multiplexing the DSL traffic onto one or more network trunk lines.

ISSU—In Service Software Upgrade. ISSU is a process that allows Cisco IOS software to be updated or 
otherwise modified while packet forwarding continues.

ODAP—On-Demand Address Pool. ODAPs enable pools of IP addresses to be dynamically increased 
or reduced in size depending on the address utilization level. Once configured, the ODAP is populated 
with one or more subnets leased from a source server and is ready to serve address requests from DHCP 
clients or from PPP sessions. 

RP—Route Processor. A generic term for the centralized control unit in a chassis

. 

SSO—Stateful Switchover. SSO refers to the implementation of Cisco IOS software that allows 
applications and features to maintain a defined state between an active and standby RP. When a switching 
occurs, forwarding and sessions are maintained. SSO makes an RP failure undetectable to the network.

See 

 for terms not included in this glossary.

Any Internet Protocol (IP) addresses used in this document are not intended to be actual addresses. Any examples, command display output, and 
figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses in illustrative content is unintentional and 
coincidental.

© 2006 Cisco Systems, Inc. All rights reserved.

CCVP, the Cisco logo, and Welcome to the Human Network are trademarks of Cisco Systems, Inc.; Changing the Way We Work, Live, Play, and Learn is 
a service mark of Cisco Systems, Inc.; and Access Registrar, Aironet, Catalyst, CCDA, CCDP, CCIE, CCIP, CCNA, CCNP, CCSP, Cisco, the Cisco 
Certified Internetwork Expert logo, Cisco IOS, Cisco Press, Cisco Systems, Cisco Systems Capital, the Cisco Systems logo, Cisco Unity, 
Enterprise/Solver, EtherChannel, EtherFast, EtherSwitch, Fast Step, Follow Me Browsing, FormShare, GigaDrive, HomeLink, Internet Quotient, IOS, 
iPhone, IP/TV, iQ Expertise, the iQ logo, iQ Net Readiness Scorecard, iQuick Study, LightStream, Linksys, MeetingPlace, MGX, Networkers, 
Networking Academy, Network Registrar, PIX, ProConnect, ScriptShare, SMARTnet, StackWise, The Fastest Way to Increase Your Internet Quotient, 
and TransPath are registered trademarks of Cisco Systems, Inc. and/or its affiliates in the United States and certain other countries. 

All other trademarks mentioned in this document or Website are the property of their respective owners. The use of the word partner does not imply a 
partnership relationship between Cisco and any other company. (0711R)