OMS 3250

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OMS3250Product Description8 UPGRADE TO OMS3260The upgrade of OMS3250 to a port subrack for OMS3260 (960 Gb/s capacity), involves thereplacement of the Switch units with Switch interface units.Each Switch interface unit is connected to the OMS3260 core via ribbon cables each containing8 fibres (4Tx and 4Rx), the traffic transmitted is arranged into the proprietary internal frame.Up to 24 port subracks can be added to OMS3260, each port subrack is allocated a shelfnumber (SN Id). This is configured and displayed on the alarm module.Each Port Subrack can be provided with Expansion Subracks available for the OMS3250.Issue 1 Copyright – Refer to Page 2 Page 39 of 74
Product DescriptionOMS32509 NETWORK APPLICATIONS AND PROTECTIONSThe OMS3250 cross connect system allows the connection of complex network configurations,such as rings, chains and stars. These topologies can also be mixed.The switching functions and the range of possible tributaries allow flexible reconfiguration of thetraffic as far as both the destination and the capacity of the transmitted circuits are concerned.The possible protection features at network level are:• MSP protection on STM-N line and tributary interfaces according to ITU-T/G.841;• "Sub-Network Connection Protection", according to ITU-T/G.841, at VC-4 VC-4-Xc, VC-3,VC-2 and VC-12 level;• "MS-SPRing" protection on STM-16 and STM-64 rings according to ITU-T/G.841.• "Ring Interworking Protection", according to ITU-T/G.842;• Fast Restoration via ASTN• OTN Protections (i.e. ODUk SNC/I and SNC/N).Also mixed protection can be applied, for example MS SPRING and SNC-P, MS-SPRing andFast Restoration or ODUk SNC/x and SNC-P.9.1 MSP protectionThe MSP function provides protection for the STM-N signal against channel-associated failureswithin a multiplex section. All possible options specified for the "Multiplex Section Protection(MSP) Protocol" (bytes K1 and K2), as defined in ITU-T/G.783 and G.841, can be used.The following criteria may be used at the receive end for switching to the protection path:• Signal Fail (LOS, LOF, MS-AIS, Excessive BER) at section level;• Signal Degrade (BER exceeds a preset threshold in the range of 10-5 to 10-9);• Command from the Local Terminal or from ServiceOn Optical Element Manager andManagement System.On STM-1/4/16/64 tributary interfaces, MSP protection is available, using a 1+1 or 1:Narchitecture; with N up to 4.When the MSP 1:N (N≥1) is provided, optional extra traffic is supported.9.2 MS-SPRing ProtectionOMS3250 equipment provides the MS-SPRing ("SDH Multiplex Section Shared ProtectionRing") protection mechanism. Its general features are defined in ITU-T Rec. 803, while thecomplete description of the protocol can be found in ITU-T Rec. G.841. Both two and four fibreoptions are supported.Page 40 of 74 Copyright – Refer to Page 2 Issue 1
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