Background/Introduction:
In country T, Operator T’s backbone transmission has to be significantly enhanced in order to support the incoming 3G and HSDPA traffic as they are planning to make up for their growth as relative latecomers to the data services (3G & HSDPA) in mobile networks. Therefore they have decided to utilize the newly available 40G OTUs in order to create a backhaul which could cater for all of their needs in terms of their backbone traffics. The equipments being utilized would be a host of OSN1800, OSN6800 and OSN8800.
Factors & Consideration:
As operator T’s traffic requirement are huge, and their newly planned network would include approximately 25 OADM nodes (OSN8800 & OSN6800), 6 ROADM (OSN8800 and OSN6800) nodes and also more than 20 Access nodes (OSN1800), there would be a challenge where the traffics has to be groomed via different product series in order to achieve the 40G OTU solution. Before the project could be implemented with a certain level of confidence, we would have to understand the limitations of the various families of products and also the corresponding boards which are involved. The strategy of the traffic grooming and relays are described as below:
Access Nodes (OSN1800):
i. ELOM board: Utilized for GE Services at the sites which utilize OSN1800. The ELOM board effective acts as an OTU which transpose a maximum of 8 GE Services into an ODU1 equivalent service. When all 8 GE services are utilized, we can transpose an equivalent of 4 x ODU1 into the network.
ii. LSX board: Utilized whenever 1 unit 10GE or STM-64 services would be necessary.
OADM Nodes (OSN8800 and OSN6800):
i. TOM Board: If there were to be GE traffics that which would be added or dropped at OADM nodes, they would be implemented via the TOM board. The TOM board is also similar to the ELOM board, in which it can transpose a maximum of 8GE Services. However the TOM board offers flexibility in which the cross connection can be performed at ODU1 or ODU0 level. For interfacing traffics which are coming from ELOM, we would utilize the ODU1 level.
ii. ND2 Board: Used to interface with ELOM boards as part of the electrical grooming from ODU1 to ODU2 signal. The ND2 board can also map the LSX signal into an ODU2 signal directly. The ND2 has two ports and it can effectively support a maximum of 2 x ODU2.
iii. NS3 Board: The NS3 board is used in tandem with the ND2 board. It functions to groom signals from 16ODU1 or 4ODU2 into an ODU3 equivalent signal.
iv. TQX Board: This board can transpose a maximum 4 units of 10GE services and map them into 4 different and independent ODU2 equivalent services.
ROADM nodes (OSN6800 and OSN8800):
The ROADM node uses the TOM, TQX & NS3 boards just as their OADM counterparts. The only difference is that these nodes are connected in multiple directions via the optical layer combination of WSM9 and RDU9. These are also the nodes where the traffic would be heavily added or dropped. Therefore, there are cases where OSN8800 T64 (with the front and back chassis) would be use in order to house more OTU boards.
Comments are closed