PacketStar
®
PSAX 12-Port Medium-Density DS1 Multiservice Module User Guide
, Issue 1
Release 8.0
255-700-243
Glossary-1
Glossary
Numeric
1+1 APS (automatic protection
switching)
In a North American SONET, 1+1 protection switching is
commonly referred to as automatic protection switching
(APS). See APS for additional information.
1+1 MSP (multiplex section protec-
tion)
In a European synchronous digital hierarchy (SDH) network,
1+1 protection switching is commonly referred to as multi-
plex section protection (MSP). See MSP for additional infor-
mation.
100Base-T
This IEEE standard specifies the transmission of data at
100 Mbps on Ethernet networks.
10Base-T
This IEEE standard (802.3) specifies the transmission of data
at 10 Mbps on Ethernet networks with twisted-pair cabling
and a wiring hub, referred to as a 10Base-T hub.
10-nibble header space
In a protocol data unit (PDU), the 40 bits of protocol control
information located at the beginning of the PDU.
5ESS switch
A digital Central Office electronic switching system made by
Lucent, typically used at an end office, which serves local sub-
scribers.
A
AAL
ATM adaptation layer. The protocol layer that allows multiple
applications to have data converted to and from the ATM cell.
AAL also refers to a protocol used to translate higher layer
services into the size and format of an ATM cell.
AAL1
ATM adaptation layer type 1. This layer supports Class A traf-
fic (uncompressed, digitized voice and video).
AAL2
ATM adaptation layer type 2. This layer supports Class B traf-
fic (variable bit rate compressed voice and video).
AAL2 trunking
A communication line established between two switching
systems that supports Class B traffic (AAL2).
AAL3/4
ATM adaption layer 3/4. This layer supports Class C and D
traffic (variable bit rate compressed voice and video).
AAL5
ATM adaptation layer type 5. This layer supports Class C traf-
fic (connection-oriented variable bit rate [VBR] data traffic
and signaling messages, used predominantly for classical IP
[CLIP] over ATM and LAN Emulation [LANE] traffic)
ABCD signaling bits
Bits robbed from bytes in each DS0 or T1 channel in particu-
lar subframes, which are then used to carry in-band all status
information.
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