Cisco 10000-2P2-2DC Software Configuration Manual page 596

Glossary
Weighted Fair Queuing. A QoS congestion management function.
WFQ
Weighted Random Early Detection. A QoS congestion avoidance function.
WRED
X
Various types of digital subscriber lines. Examples include ADSL, HDLS, and VDSL.
xDSL
Cisco 10000 Series Router Software Configuration Guide
GL-12
OL-2226-23