Installation guide

GL-7
Cisco 6260 Hardware Installation Guide
OL-2365-02
GLOSSARY
Numerics
2B1Q
2 binary 1 quaternary. An encoding scheme that provides a 2 bits per baud, 80k baud per second,
160kbps transfer rate. The most common signaling method on ISDN U interfaces.
4xflexi
quad-port flexi ATU-C line card. Supports four ADSL modem connections and CAP, DMT, and G.lite
line encoding. For chassis compatibility, refer to the Cisco DSLAM Compatibility Notes or the
appropriate hardware installation guide.
4xSDSL
quad-port STU-C line card. Supports four SDSL modem connections and 2B1Q line encoding. For
chassis compatibility, refer to the Cisco DSLAM Compatibility Notes or the appropriate hardware
installation guide.
8xDMT
octal-port DMT ATU-C line card. Supports eight ADSL modem connections and DMT line encoding.
For chassis compatibility, refer to the Cisco DSLAM Compatibility Notes or the appropriate hardware
installation guide.
8xG.SHDSL
octal-port SHTU-C line card. Supports eight G.SHDSL modem connections and TC-PAM line
encoding. For chassis compatibility, refer to the Cisco DSLAM Compatibility Notes or the appropriate
hardware installation guide.
8xIDSL
octal-port ITU-C line card. Supports eight IDSL modem connections, or four connections when the
chassis limits the number of tip and ring connectors. Supports 2B1Q line encoding. For chassis
compatibility, refer to the Cisco DSLAM Compatibility Notes or the appropriate hardware
installation guide.
A
AAL
ATM adaptation layer. AAL is an adaptation layer within the data link layer of the OSI model. AAL is
divided into a segmentation and reassembly sublayer (SAR) and a convergence sublayer. The SAR
divides the application datastream into transmit cells and then reassembles the received cells into a
datastream that is compatible with the related application. The convergence sublayer specifies the
requirements for the various types of applications that run over ATM. AAL is defined in terms of types,
1 to 5, specified by the type of traffic that it supports. Each type offers an appropriate QoS.
ABR
available bit rate. A QoS class defined by the ATM Forum for ATM networks. ABR is used for
connections that do not require timing relationships between source and destination. ABR provides no
guarantees in terms of cell loss or delay, providing only best-effort service. Traffic sources adjust their
transmission rate in response to information they receive describing the status of the network and its
capability to successfully deliver data. Compare with CBR, UBR, and VBR.