OMS 3250

Product DescriptionOMS3250N dedicated cards, with a LO-VC switch on board, can be placed in any of the traffic slots. Asthe card consumes traffic capacity, the LO-VC Switch card performs SDH processing down toLO-VC level (i.e. included TU Pointer processing and LO-VC OH monitoring) of STM-n signalsconnected on the front of the unit.The integration of a LO-VC Switch inside OMS3250 allows cross-connections down to VC-3,VC-2, and VC-12 levels and it is open to support VC-11 cross-connection as well.Up to 8 Sockets are present on the card and can be equipped with different SFP modules toobtain the following configurations:• 2xSTM-16;• 8xSTM-4;• 8xSTM-1Mixed configurations with STM-1, STM-4 and STM-16 are also supported, with the constraintnot to exceed 2 x STM-16-equivalent bandwidth.The LO-VC Switch can be considered a hybrid card: it merges on the same card both theswitching and the traffic processing features.For redundancy purposes OMS3250 can be equipped with two LO-VC Switch cards (Unit A andUnit B): one of them shall operate as “Working” and the other as “Protection”. In addition, inorder to provide the maximum availability each LO-VC Switch card is connected to both the"Working" and the "Protecting" HO-VC switching subsystem and cross connect the tributarytraffic collected by the companion card: both Unit A and Unit B switch the traffic collected byW1,..Wn, E1,..En (Figure 10). The traffic collected by W1,..Wn is processed down to LO-VClevel (i.e. TU pointer processing and LO-VC monitoring included) on Unit A, while the trafficcollected by E1,..En is processed on Unit B. The two units then exchanges the processed datavia backplane links, therefore the two Units of the LO-VC Switching subsystem must be fitted inprecise slots of OMS3250 to provide the redundancy.Page 36 of 74 Copyright – Refer to Page 2 Issue 1