Instruction/ maintenance manual of the product 78-11450-03 Cisco Systems
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GL-1 Cisco uBR10012 Universal Broadband Rout er Hardware Installation Guide 78-11450-03 Rev.B0 GLOSSARY S ymbols 1+1 APS See APS . 10BASE-T 10-Mbps baseband Ethernet specif icat ion using tw o pair s of twisted -pair cabling (Cate gory 3, 4, o r 5): one pair for transmitting data and the other for recei ving data.
Glossary GL-2 Cisco uBR10012 Universal Broadband Rout er Hardware Installation Guide 78-11450-03 Rev.B0 A AAL A TM adaptatio n layer . Service-de pendent sub layer of the data link layer . The AAL accepts data from dif ferent applicat ions and presents it to the A TM layer in the form of 48-b yte A TM payload segments.
Glossar y GL-3 Cisco uBR10012 Universal Broadband Rout er Hardware Installation Guide 78-11450-03 Rev.B0 B Backplane The circuit board at the back of the chassis that all component s plug into. It provides the physical connection between an interface processor or line car d, and the data and po wer distrib ution buses inside a chassis.
Glossary GL-4 Cisco uBR10012 Universal Broadband Rout er Hardware Installation Guide 78-11450-03 Rev.B0 CO Central off ice. The local telephone company of fice to which all lo cal loops in a gi ve n area connect and in which circuit switchi ng of subscriber lines occurs.
Glossar y GL-5 Cisco uBR10012 Universal Broadband Rout er Hardware Installation Guide 78-11450-03 Rev.B0 E E1 W ide-area digital transmission scheme used predominantl y in Eu rope that carries data at a rate of 2 .048 Mbps. E1 lines can be leased for priv ate us e from common carriers.
Glossary GL-6 Cisco uBR10012 Universal Broadband Rout er Hardware Installation Guide 78-11450-03 Rev.B0 Frame Relay Industry-standard, switched data link layer protocol that handles multiple virtual circuits using HDLC encapsulation between connected de vices.
Glossar y GL-7 Cisco uBR10012 Universal Broadband Rout er Hardware Installation Guide 78-11450-03 Rev.B0 IOS Internet Operating System. See Cisco IOS . IP Internet Protoc ol. Network layer prot ocol in the TC P/ IP stack o ffering a co nnectionless internetwork service.
Glossary GL-8 Cisco uBR10012 Universal Broadband Rout er Hardware Installation Guide 78-11450-03 Rev.B0 M M13 Generic term for equipment t hat multiple xes DS1s into DS3s. Sometimes used to describe a specif ic DS3 multiplex format. Some standards use this term to describe a synchronous multiple xing format also kno w as SYNTRAN.
Glossar y GL-9 Cisco uBR10012 Universal Broadband Rout er Hardware Installation Guide 78-11450-03 Rev.B0 Multicast Single packets copied by the netw ork and sent to a specific subset of ne twork addresses. Thes e addresses are specified in the Destin atio n Address field.
Glossary GL-10 Cisco uBR10012 Universal Broadband Rout er Hardware Installation Guide 78-11450-03 Rev.B0 Optical carrier See OC . Optical fiber See Fiber -optic cable . P Packet Logical grouping of information that incl udes a header containing control information and (usually) user data.
Glossar y GL-11 Cisco uBR10012 Universal Broadband Rout er Hardware Installation Guide 78-11450-03 Rev.B0 PRE Performance routing engi ne. The central routing unit fo r the Cisco uBR10012 uni versal bro a dband router .
Glossary GL-12 Cisco uBR10012 Universal Broadband Rout er Hardware Installation Guide 78-11450-03 Rev.B0 S SAR Segmentation an d reassembly . One of the two sublayers o f the AAL common part con verge.
Glossar y GL-13 Cisco uBR10012 Universal Broadband Rout er Hardware Installation Guide 78-11450-03 Rev.B0 T3 Digital W AN carrier facility . T3 transmits DS3-formatted data at 44.736 Mbp s through the telephone switching network. TAC A Cisco T echnical Assistance Cente r .
Glossary GL-14 Cisco uBR10012 Universal Broadband Rout er Hardware Installation Guide 78-11450-03 Rev.B0 U UBR See Univ ersal Broa dband Rout er . Unchannelized DS3 See Clear channel DS3 . Unicast A message sent to a single network destinati on. Compare with Broadcast and Multicast .
Glossar y GL-15 Cisco uBR10012 Universal Broadband Rout er Hardware Installation Guide 78-11450-03 Rev.B0 Wide-area network See WA N . WRED W eighted Random Early Detection. RED uses an algo r ithm to r andomly discar d packets.The result of the drop is that the source detects the d ropped traf f ic and slows its transmission.
Glossary GL-16 Cisco uBR10012 Universal Broadband Rout er Hardware Installation Guide 78-11450-03 Rev.B0.
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