My guess is that they bundled OC48 traffic and split it at the far end ( edge switch -->oc768---> edge switch ). They could have used real voice/video data ( unlikely ) or probably had an ATM test cell sequence ( standard random bit content called PRBS sequences)in 16 OC-48 sreams...which can be multiplexed into 4 x OC-192 streams...which is multiplexed into 1xOC-768 and demultiplexed in the same manor at the far end.
SONET switches do not manipulate data streams in the same way as PC decodes IP packets. Special framing chips generate/decode the electrical stream which is the conversion of light to electrical. The chips decode the payload and send it to forwarding hardware which in turn sends to a backplane fabric and out to some other piece of similar hardware. Multiple custom ASICS provide a physical route for the data. At OC768 though the data stream is probably not touched at all just pure light to electrical job.
The transmission is diskless and ramless in this context, especially since the generator equipment is creating payloads in hardware.
T1,T3 are transmission rates that descibe electrical interfaces. A T1 link is 1.5mb ( bits ) T3 = 45mb. OC ( optical carrier ) is a BellCore description of transmission in SONET networks. ( Synchronous Optical Network ).
The speed of OC-n is derived from the number of interleaved STS streams. STS-1 is 51mb per second All OC-n rates ( lowest is OC-3 which sts-1x3 ) are derived from a multiple of this.
OC-768 = 768xSTS1 rate = 39168mb per second OC-48 = 48xSTS-1 rate = 2448mb per second OC-3 = 3xSTS-1 rate = 153mb per second
OC-n rates can be described as concatenated ( a fat pipe ). or Channelized whereby an OC pipe contains multiple channels ( STS payloads )each of which can contain different payloads ( packets or atm cells ). Oc-3c is a concat. fat pipe. Oc-3 is a channelized pipe.
Slashdot Mirror
I think if you include the SONET headers yes 155 megabits per second...If you mean the payload...its 153.
My guess is that they bundled OC48 traffic and split it at the far end ( edge switch -->oc768---> edge switch ). They could have used real voice/video data ( unlikely ) or probably had an ATM test cell sequence ( standard random bit content called PRBS sequences)in 16 OC-48 sreams ...which can be multiplexed into 4 x OC-192 streams...which is multiplexed into 1xOC-768 and demultiplexed in the same manor at the far end.
SONET switches do not manipulate data streams in the same way as PC decodes IP packets. Special framing chips generate/decode the electrical stream which is the conversion of light to electrical. The chips decode the payload and send it to forwarding hardware which in turn sends to a backplane fabric and out to some other piece of similar hardware. Multiple custom ASICS provide a physical route for the data. At OC768 though the data stream is probably not touched at all just pure light to electrical job.
The transmission is diskless and ramless in this context, especially since the generator equipment is creating payloads in hardware.
T1,T3 are transmission rates that descibe electrical interfaces. A T1 link is 1.5mb ( bits )
T3 = 45mb. OC ( optical carrier ) is a BellCore
description of transmission in SONET networks. ( Synchronous Optical Network ).
The speed of OC-n is derived from the number of interleaved STS streams. STS-1 is 51mb per second
All OC-n rates ( lowest is OC-3 which sts-1x3 ) are derived from a multiple of this.
OC-768 = 768xSTS1 rate = 39168mb per second
OC-48 = 48xSTS-1 rate = 2448mb per second
OC-3 = 3xSTS-1 rate = 153mb per second
OC-n rates can be described as concatenated ( a fat pipe ). or Channelized whereby an OC pipe contains multiple channels ( STS payloads )each
of which can contain different payloads ( packets or atm cells ).
Oc-3c is a concat. fat pipe.
Oc-3 is a channelized pipe.