OMS 3250

OMS3250Product DescriptionEoW8 Ports(64k Datachannel)......4 Ports(n*64k Datachannel)..Aux CardGenericLine SlotsOptics Slots(STM-256OICs)Tribs SlotsMSH-2KTribs(1 - 32)Figure 19: Distribution of OH BytesThe transport of terminated SOH bytes uses various mechanisms.• Bytes that need to be transported to/from the Comms card (e.g. DCC bytes) are packetisedand transported over the Ethernet Comms Bus. (Figure 18)• Bytes that need to be transported to/from the Switch (e.g. K1, K2, etc.) use the internalpseudo SOH (pSOH) associated with the traffic stream. (Figure 16)• Bytes that need to be transported to the Aux card (e.g. E1, E2, F1, CMux-2 Aux bytes, etc.)use a dedicated OH bus. (Figure 19)Overhead bypass for bytes that would normally be transported to the Aux card (e.g. E1, E2,F1, CMux-Aux bytes1 & 2, etc.) are achieved by cross-connecting them on the Aux card.The access to OH bytes is provided by the overhead distribution bus, which connects the trafficcards to the Controller/ Communications and Auxiliary cards.Issue 1 Copyright – Refer to Page 2 Page 53 of 74