CTC Store CTS Union IP DSLAM for ADSL IPDSLAM-A8/A16 - Manual (Page 136)

X
DSL implementations through a process of time-division multiplexing (TDM) at the
CO or remote line shelf. This device is usually located in the CO for termination of
multiple customer DSL devices.
ESS (Error Seconds)
ESS is a generic term with various meanings depending on the signal standards
domain in which it’s being used.
Ethernet
One of the most popular baseband LANs in widespread use. It is a carrier sense
multiple access collision detect (CSMA/CD) system using coaxial cable and
developed by Xerox, Intel, and Digital Equipment Corporation. Introduced in 1979.
Ethernet Version II is compatible with the IEEE 802.3 CSMA/CD standard.
G.SHDSL
G.SHDSL is a standards-based, multirate version of HDSL-2 and offers
symmetrical service. The advantage of HDSL-2, which was developed to serve as
a standard by which different vendors' equipment could interoperate, is that it is
designed not to interfere with other services. However, the HDSL-2 standard
addresses only services at 1.5 Mbps. Multirate HDSL-2 is part of Issue 2 of the
standard known as G.SHDSL, and is ratified by the ITU. G.SHDSL builds upon the
benefits of HDSL-2 by offering symmetrical rates of 2.3 Mbps.
IGMP
Internet Group Management Protocol is defined in RFC 1112 as the standard for
IP multicasting in the Internet.
It's used to establish host memberships in particular multicast groups on a single
network. The mechanisms of the protocol allow a host to inform its local router,
using Host Membership Reports, that it wants to receive messages addressed to
a specific multicast group.
All hosts conforming to level 2 of the IP multicasting specification require IGMP.
IGMP Snooping
IGMP snooping, as implied by the name, is a feature that allows an Ethernet
switch to "listen in" on the IGMP conversation between hosts and routers. When a
Switch hears an IGMP report from a host for a given multicast group, the switch
adds the host's port number to the IGMP list for that group. And, when the switch
hears an IGMP leave, it removes the host's port from the IGMP list.
IP
Internet Protocol. Network layer protocol in the TCP/IP stack offering a
connectionless internetwork service. IP provides features for addressing,
type-of-service specification, fragmentation and reassembly, and security. Defined