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FibeAir IP-10 G-Series
TDM Adaptive Band Recovery (ABR) Path Protection
®
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Proprietary and Confidential
BW utilization with standard SNCP
A major drawbac of rin! topolo!y i" the allocation of red#ndant bandwidth in
order to en"#re networ availability$
2
%or e&le' the widelyimplemented
*CP +,+ #nidirectional protection
"cheme re-#ire" the "im#ltaneo#"
tran"mi""ion of information in bothdirection" on the rin!
Thi" ca#"e" a lo"" of #p to ./0 of the
rin!1" total bandwidth capacity2
Active Trail
Duplicated(Protective)
Trail
SNCP trails
consume double
BW, hence less is
available for ETH
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A novel approach to BW Efficiency
3 Cera!on1" %ibeAir 4P+/' i" capable of protectin! TDM "ervice" witho#tre"ervin! lar!e -#antitie" of bandwidth
3 Cera!on1" novel approach improve" the efficiency of rin!ba"ed protection'#"in! a techni-#e called Protected Adaptive Bandwidth Recovery (5ABR6)
which enable" f#ll #tili7ation of the bidirectional capabilitie" inherent in rin!technolo!ie"
3 4n the event of a fail#re' the "y"tem revert" bac to "tandard *CP and the#n#"ed capacity i" reallocated for TDM tran"mi""ion
3
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Proprietary and Confidential
A novel approach to BW Efficiency
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8ith ABR' the TDMba"ed information
i" tran"mitted in one direction only'
while the #n#"ed protection capacity i"
allocated for 9thernet traffic
Active Trail
!used or "Pe!di!#$S%&P trail capacit' is
allocated or T*services
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ABR :peration
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Proprietary and Confidential
ABR SNCP Operation
The ABR feat#re con"i"t" of the followin! component"$
+; i!nalin! i" di"trib#ted between the endpoint" of every trail point to
e&chan!e information abo#t the -#ality of the received "i!nal"
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ABR SNCP Operation: Sinalin
i!nalin! i" di"trib#ted between the endpoint" of every trail point to e&chan!e
information abo#t the -#ality of the received "i!nal"
3 9ach endpoint may "end an RD4 "i!nal alon! each path (primary and
"econdary) to the other end point
3 RD4 i" "ent whenever a valid TDM trail "i!nal i" not received
,
1 o4
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ABR SNCP Operation: !oics
=o!ic determine" in which ca"e" traffic can or cannot be "ent thro#!h one of
the path"$
3 @nder normal condition"' TDM traffic i" "ent only thro#!h the primary path
3 4n order to mae proper #"e of the freed capacity' it i" nece""ary for the 9thernettraffic to #"e the "ame path in both direction"
3 %or thi" rea"on' any fail#re in the primary path will ca#"e both "ide" to revert tothe normal mode of operation ("endin! traffic thro#!h both path"); Traffic will
ret#rn to the primary path after the fail#re condition ha" been cleared (themechani"m i" revertive)
3 4n order to prevent jitterin! of the path and #nnece""ary traffic "witche" in ca"e ofintermittent primary path fail#re"' there i" a revertive timer; Thi" timer determine"
the amo#nt of time re-#ire after no fail#re i" detected in the primary path before
cea"in! traffic tran"mi""ion thro#!h the "econdary path
2 o4
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3 o4
ABR SNCP Operation: Auto BW Release
Auto"atically freein #andwidth whenever $%& traffic is not #ein sent:
3 8henever valid TDM traffic i" not available at the radio interface for tran"mi""ion'it" bandwidth i" a#tomatically reallocated for 9thernet traffic
3 Thi" i" relevant not only for ABR trail"' b#t for all $%& traffic' 4n other word"'bandwidth i" freed #p whenever there i" no information to tran"mit; Thi" may
occ#r in the followin! circ#m"tance"$
+; A fail#re ha" occ#rred which interr#pt" TDM traffic in a certain trail; Thi"
may tae place in a radio lin or an internal connection; A4 "i!nal i" detected at the inp#t (if A4 detection feat#re i" enabled)
.
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4 o4
ABR SNCP Operation: Receivin Standard SNCP
Selectin the inco"in traffic nor"ally as e(plained for SNCP trails:
3 The ABR mechani"m i" relevant only for the tran"mi""ion
3 Reception i" dealt with in the "ame manner a" normal *CP trail"
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ABR Confi!#ration
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ABR SNCP Confiuration
A new type of trail" (ABR trail") i" defined' in addition to protected and#nprotected trail";
ABR trail" are confi!#red e&actly in the "ame way a" normal *CP trail" and
are "#bject to the "ame validation"; Thi" i" beca#"e in the wor"tca"e (fail#re
condition) ABR trail" behave lie normal *CP trail"' occ#pyin! bandwidth in
both path";
The followin! are e&tra confi!#ration and behavior e&cl#"ive for ABR trail"$
3Revertive ti"er $ the "ame timer i" #"ed for all trail"
3)orcin ABR trails$ when forcin! reception of an ABR trail from the "econdary path the"y"tem will a#tomatically ca#"e both endpoint" to tran"mit traffic thro#!h that path'
re!ardle"" of fail#re condition"; The traffic will cea"e to be "ent when 5force none6 i"
confi!#red
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ABR SNCP *ser +ndications
The followin! indication" are added for TDM trail"$
3 RD4 indication i" !iven per trail to the #"er
3 eparate "tat#" indication" are !iven for each path$
3 %or *CP trail"' "tat#" i" alway" !iven for primary and "econdary path"
3 %or ABR trail"' "tat#" i" !iven for path" which are c#rrently tran"mittin! with nofail#re condition" thi" mean" the primary path only;
3 PM" are collected a" follow"$
+; Primary i" active *o PM co#nted on "econdary;
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Thank You !
trai!i!#/cera#o!co