OMS 3250

More documents

Recommendations

Info

OMS3250Product Description9.5 Sub-network connection protectionThe "Sub-Network Connection Protection" is defined in ITU-T Rec. G.803 and ITU-T Rec.G.841.When OMS3250 systems are connected in a subnetwork (e.g. a ring topology) the relevant VC-4 of the signal to be protected can be protected, by transmitting it from the input tributary to twooutput interfaces. At the receive side, the available or better-quality signal is selected.The switching between the two directions is based on the following criteria:• AU-AIS and AU-LOP alarms at the VC level (inherent monitoring);• Error performances (BIP information), payload and routing correctness (Unequipped Signaland Trace Identifier) at the VC level (non intrusive monitoring);• Command from the Local Terminal or from Element Manager.In this way, the channel is protected against any single failure in the subnetwork.The following ODUk protection architectures are supported:• 1+1 unidirectional SNC/Nand SNC/IIn these architectures, a permanent bridge is utilised at the transmit end. At the receiverend, a protection switch is realized by selecting one of the signals based on purely localinformation.For protection switching criteria, non-intrusive (SNC/N) or server layer (SNC/I) monitoringshall be used.• 1+1 bi-directional SNC/Nand SNC/IIn these architectures, a permanent bridge is utilised at the transmit end. At the receiveend, a protection switch is realised by selecting one of the signals based on local or remoteinformation. For protection switching criteria, non-intrusive (SNC/N) or server layer (SNC/I)monitoring is used.These types of protection use the automatic protection switching protocol (APS).• 1:N an SNC/I protectionIn this architecture N working subnetwork connections that are to be protected share anadditional subnetwork connection for protection purposes. In a normal condition, thisprotection capacity can be used to carry lower priority “extra traffic”. This extra traffic itself isnot protected and is to be replaced by higher priority working traffic under failure conditions.This architecture requires the APS as protection control.For protection switching criteria, server layer (SNC/I) monitoring is used.The architecture can be unidirectional or bi-directional.For 1+1 architecture the revertive or not-revertive mode of operations is available.For each type of protection, manual external command is available to the operator.Issue 1 Copyright – Refer to Page 2 Page 43 of 74
Product DescriptionOMS32509.6 OS RestorationIt is possible to perform network protection using rerouting. This protection scheme is mainlyoperated by the network management system using the capabilities of cross-connectionreconfiguration offered by OMS3250.Spare capacity is reserved on each link of a meshed network in order to provide alternativeroutes on which traffic can be transported. In case of cable break the traffic transported by thefailed link is redirected along pre-programmed or on-line calculated alternative routes using theavailable reserved capacity.9.7 Fast RestorationAs well as conventional SDH protection schemes the OMS3250 will support ITU-T(ASON/ASTN) based fast network restoration. This method of protection is particularly effectivein mesh network architectures.The OMS3250 will simultaneously support all SDH protection schemes and network restorationmaking it the ideal switching solution for operators wishing to migrate from one scheme toanother. The Marconi solution offers full scalability to meet the needs of large operators whotypically could have hundreds of dynamic elements in their networks.Spare capacity is reserved on each link of a meshed network, in order to provide alternativeroutes on which traffic can be transported. In case of cable break the traffic transported by thefailed link is redirected along pre-programmed or on-line calculated alternative routes using theavailable reserved capacity.This protection scheme can be applied at any cross-connected level, i.e. VC4, VC4-nc andODU.Page 44 of 74 Copyright – Refer to Page 2 Issue 1
Page 1 and 2: Prepared (also subject responsible
Page 3 and 4: Product DescriptionOMS3250Document
Page 5 and 6: Product DescriptionOMS325011.2 Inte
Page 7 and 8: Product DescriptionOMS3250List of T
Page 9 and 10: Product DescriptionOMS3250OCHOptica
Page 11 and 12: Product DescriptionOMS32501 INTRODU
Page 13 and 14: Product DescriptionOMS3250Figure 2:
Page 15 and 16: Product DescriptionOMS3250The OMS32
Page 17 and 18: Product DescriptionOMS3250Figure 6:
Page 19 and 20: Product DescriptionOMS3250Interface
Page 21 and 22: Product DescriptionOMS3250STM-1:S-1
Page 23 and 24: Product DescriptionOMS3250• FEC d
Page 25 and 26: Product DescriptionOMS3250- Extra L
Page 27 and 28: Product DescriptionOMS3250• Incre
Page 29 and 30: Product DescriptionOMS3250• Mappi
Page 31 and 32: Product DescriptionOMS32505 SDH SEC
Page 33 and 34: Product DescriptionOMS3250N1NETWORK
Page 35 and 36: Product DescriptionOMS32507 CONNECT
Page 37 and 38: Product DescriptionOMS3250N dedicat
Page 39 and 40: Product DescriptionOMS3250MSH2KHO-V
Page 41 and 42: Product DescriptionOMS32509 NETWORK
Page 43: Product DescriptionOMS3250A-CC-AAB-
Page 47 and 48: Product DescriptionOMS325011 EQUIPM
Page 49 and 50: Product DescriptionOMS3250and are b
Page 51 and 52: Product DescriptionOMS3250• Overh
Page 53 and 54: Product DescriptionOMS3250F(LCT)Q E
Page 55 and 56: Product DescriptionOMS325011.2.6 Po
Page 57 and 58: Product DescriptionOMS3250The cards
Page 59 and 60: Product DescriptionOMS325011.5.3 Ot
Page 61 and 62: Product DescriptionOMS325012 ALARMS
Page 63 and 64: Product DescriptionOMS3250The power
Page 65 and 66: Product DescriptionOMS3250Performan
Page 67 and 68: Product DescriptionOMS32508 × 64 K
Page 69 and 70: Product DescriptionOMS325015.4 Reco
Page 71 and 72: Product DescriptionOMS3250The main
Page 73 and 74: Product DescriptionOMS3250Relative
Page 75: Product DescriptionOMS3250• EN 60

OMS 3250

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?