Interworking issues between 10GBE WAN and existing transmission network
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1 IEEE G.802.3ae May St Louis Interworking issues between 10GBE WAN and existing transmission network Jean Loup FERRANT ALCATEL 10GBE WAN interworking issues 1
2 introduction The problem of mapping 100 ppm 10GBE WAN in OTN G.709 frames has been discussed during the last IEEE plenary meeting in March. The purpose of this presentation is to show that this 100 ppm specification will impact interworking with other type of equipment that are already deployed in transmission networks. 10GBE WAN interworking issues 2
3 Network considerations 10GBE specifies a WAN application with an OC192 frame in order to provide interconnection between distant equipments such as routers. The existing transmission network is now based on 2 layers, SONET/SDH and DWDM. In a near future, OTN and all optical networks will be introduced 10GBE WAN interworking issues 3
4 Expected problems with 100 ppm 10GBE WAN In March, it has been shown the impossibility to mapp 100 ppm 10GBE WAN inside the new G.709 frame. The SONET/SDH physical layer has been specified more than 10 years ago with an accuracy of 20 ppm. All existing SONET/SDH interfaces have been specified to accept signals within 20 ppm but not 100 ppm 10GBE WAN interworking issues 4
5 Expected problems with 100 ppm 10GBE WAN This impacts the following equipments: SONET/SDH equipments DWDM with their SONET/SDH interfaces OTN G.709 equipments Many problems can be expected when OC192 10GBE WAN customers discover they cannot transport this signal through existing transmission network. 10GBE WAN interworking issues 5
6 Solutions 2 solutions adapt 10GBE WAN to SONET/SDH adapt SONET/SDH to 10GBE WAN note: ELTE if they exist at OC192 level cannot be considered as a good solution since this would require insertion of a new equipment in the network: this raises questions on management, spacing and redundancy issues. And since this equipment would have a 20ppm oscillator, why not put it directly in the OC192 source? 10GBE WAN interworking issues 6
7 Solution 1: adaptation of 10GBE WAN Insert a 20 ppm option to the WAN application of 10GBE logical, new equipments take care of existing ones easy and inexpensive to implement, as discussed in March: the oscillator generating the 10GBE WAN frame is the only required modification; all other functions impacted by the frequency accuracy, clock recovery, FIFO, etc work within 20ppm since specified to work within 100 ppm 10GBE WAN interworking issues 7
8 Solution 2:adapt SONET interface to 100 ppm Clock recovery of input OC192 interfaces need to be redesigned to accept 100 ppm this means replacement of equipments already in the fields input signal must be adapted to SONET/SDH frequency. The SDH frame allows 1 pointer event each 4 frames: pointer processors could accept 100 ppm deviation, but this has never been requested nor tested. Test equipments are not even qualified for that. 10GBE WAN interworking issues 8
9 Solution 2:adapt SONET interface to 100 ppm Once passed through a pointer processor, the new frame is within 4.6 ppm with 100 pointer rate and can be transported through SONET/SDH. Only the equipment extracting the payload from the 10GBE may present unexpected rate of pointers and high level of wander but this is to the terminal equipment to take care of the client requirement. 10GBE WAN interworking issues 9
10 Solution 2: adapt DWDM equipments OC192 clock recovery should also be modified to accept 100 ppm. This implies redesign and update in the fields. 10GBE WAN interworking issues 10
11 Solution 2: adapt G.709 OTN OC192 clock recovery should also be modified to accept 100 ppm The SDH layer is not accessed in an OTN equipment: it is only mapped in the OTN frame. Adaptation means(see figure on next page): terminate (sink) of an OC192 process the SONET/SDH pointer terminate (source) of a new OC192 frame 10GBE WAN interworking issues 11
12 Required modifications in OTN NE C D R Client data Client CK ±100 ppm SDH termination MSA adaptation SDH Generator System CK ±20 ppm OTU Generator OUT2 G.709 signal 10 Gb/s Ethernet WAN interface SDH/OTU interface 10GBE WAN interworking issues 12
13 Complexity of adapting an OTN NE Implementation of such modification is estimated to be about 400K gates. The total complexity of the adaptation is redesign new clock recovery design a new 400K gates ASIC management of a new layer in OTN NEs, adding complexity to the network manager 10GBE WAN interworking issues 13
14 conclusion These slides have shown how complex, expensive and time consuming it will be to use the current 10GBE WAN interface in existing transmission networks. These interworking problems will severily impact the use of 10GBE WAN when customers discover it is not compatible with OC 192 interfaces. 10GBE WAN interworking issues 14
15 Conclusion and proposal Replacement of a 100 ppm oscillator by a 20 ppm one is not a large modification. Adaptation of SONET based NEs to 100 ppm has been shown to be very complex It is requested that 10GBE WAN application has a 20 ppm option so that customers and operators will not face interworking problems in their existing networks. 10GBE WAN interworking issues 15
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