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Why is there a separate set of 10 Gigabit fiber-optic transmission standards for WANs/SONET?
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So, I'm reviewing the different IEEE transmission standards for an exam, and I've noticed that for the 10GBASE-X standards, there's two different sets of fiber-optic standards, 10GBASE-xW and 10GBASE-xR. It's noted that the W standards are for WANs and a bit of googling turns up that they're "SONET capable", but I don't really know what that means.
They have the same ranges, same data rates (or at least, not difference is noted), use the same wavelengths (I mean, yes, SW/SR uses a different wavelength of light than LW/LR, but the W and R ones don't differ), and they're both IEEE 802.3z specifications.
and importantly, I haven't seen separate specifications for WAN/SONET and LAN fiber-optic transmission standards in the lower speeds---gigabit and 100M fast ether net just have one set of IEEE fiber-optic transmission standards
So why are there separate specifications for the 10 gigabit standards?
what does it mean to be "SONET capable" and why did we only need that for 10 gigabit speeds?
fiber 10gbase
asked 1 hour ago
Xovvo
284
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up vote
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So, I'm reviewing the different IEEE transmission standards for an exam, and I've noticed that for the 10GBASE-X standards, there's two different sets of fiber-optic standards, 10GBASE-xW and 10GBASE-xR. It's noted that the W standards are for WANs and a bit of googling turns up that they're "SONET capable", but I don't really know what that means.
They have the same ranges, same data rates (or at least, not difference is noted), use the same wavelengths (I mean, yes, SW/SR uses a different wavelength of light than LW/LR, but the W and R ones don't differ), and they're both IEEE 802.3z specifications.
and importantly, I haven't seen separate specifications for WAN/SONET and LAN fiber-optic transmission standards in the lower speeds---gigabit and 100M fast ether net just have one set of IEEE fiber-optic transmission standards
So why are there separate specifications for the 10 gigabit standards?
what does it mean to be "SONET capable" and why did we only need that for 10 gigabit speeds?
fiber 10gbase
asked 1 hour ago
Xovvo
284
1
I think you are trying to compare two completely different protocols: ethernet and SONET. Ethernet is an IEEE protocol (802.3), but SONET is an ITU protocol, originally designed for telephone virtual circuits, but it also often used for data WAN.
– Ron Maupin♦
47 mins ago
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up vote
2
down vote
favorite
up vote
2
down vote
favorite
So, I'm reviewing the different IEEE transmission standards for an exam, and I've noticed that for the 10GBASE-X standards, there's two different sets of fiber-optic standards, 10GBASE-xW and 10GBASE-xR. It's noted that the W standards are for WANs and a bit of googling turns up that they're "SONET capable", but I don't really know what that means.
They have the same ranges, same data rates (or at least, not difference is noted), use the same wavelengths (I mean, yes, SW/SR uses a different wavelength of light than LW/LR, but the W and R ones don't differ), and they're both IEEE 802.3z specifications.
and importantly, I haven't seen separate specifications for WAN/SONET and LAN fiber-optic transmission standards in the lower speeds---gigabit and 100M fast ether net just have one set of IEEE fiber-optic transmission standards
So why are there separate specifications for the 10 gigabit standards?
what does it mean to be "SONET capable" and why did we only need that for 10 gigabit speeds?
fiber 10gbase
asked 1 hour ago
Xovvo
284
So, I'm reviewing the different IEEE transmission standards for an exam, and I've noticed that for the 10GBASE-X standards, there's two different sets of fiber-optic standards, 10GBASE-xW and 10GBASE-xR. It's noted that the W standards are for WANs and a bit of googling turns up that they're "SONET capable", but I don't really know what that means.
They have the same ranges, same data rates (or at least, not difference is noted), use the same wavelengths (I mean, yes, SW/SR uses a different wavelength of light than LW/LR, but the W and R ones don't differ), and they're both IEEE 802.3z specifications.
and importantly, I haven't seen separate specifications for WAN/SONET and LAN fiber-optic transmission standards in the lower speeds---gigabit and 100M fast ether net just have one set of IEEE fiber-optic transmission standards
So why are there separate specifications for the 10 gigabit standards?
what does it mean to be "SONET capable" and why did we only need that for 10 gigabit speeds?
fiber 10gbase
fiber 10gbase
asked 1 hour ago
Xovvo
284
asked 1 hour ago
Xovvo
284
asked 1 hour ago
Xovvo
284
asked 1 hour ago
Xovvo
284
asked 1 hour ago
Xovvo
284
284
1
I think you are trying to compare two completely different protocols: ethernet and SONET. Ethernet is an IEEE protocol (802.3), but SONET is an ITU protocol, originally designed for telephone virtual circuits, but it also often used for data WAN.
– Ron Maupin♦
47 mins ago
add a comment |Â
1
I think you are trying to compare two completely different protocols: ethernet and SONET. Ethernet is an IEEE protocol (802.3), but SONET is an ITU protocol, originally designed for telephone virtual circuits, but it also often used for data WAN.
– Ron Maupin♦
47 mins ago
1
1
I think you are trying to compare two completely different protocols: ethernet and SONET. Ethernet is an IEEE protocol (802.3), but SONET is an ITU protocol, originally designed for telephone virtual circuits, but it also often used for data WAN.
– Ron Maupin♦
47 mins ago
I think you are trying to compare two completely different protocols: ethernet and SONET. Ethernet is an IEEE protocol (802.3), but SONET is an ITU protocol, originally designed for telephone virtual circuits, but it also often used for data WAN.
– Ron Maupin♦
47 mins ago
add a comment |Â
1 Answer
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From IEEE 802.3 Clause 50.1: (emphasis mine)
The WAN Interface Sublayer (WIS) is an optional PHY sublayer that may
be used to create a 10GBASE-W PHY that is data-rate and format
compatible with the SONET STS-192c transmission format defined by
ANSI, as well as the Synchronous Digital Hierarchy (SDH) VC-4-64c
container specified by ITU. The purpose of the WIS is to allow
10GBASE-W equipment to generate Ethernet data streams that may be
mapped directly to STS-192c or VC-4-64c streams at the PHY level,
without requiring MAC or higher-layer processing. The WIS therefore
specifies a subset of the logical frame formats in the SONET and SDH
standards. In addition, the WIS constrains the effective data
throughput at its service interface to the payload capacity of
STS-192c / VC-4-64c, i.e., 9.58464 Gb/s. Multiplexed SONET/SDH formats
are not supported.
The WIS does not render a 10GBASE-W PHY compliant
with either SONET or SDH at any rate or format. A 10GBASE-W interface
is not intended to interoperate directly with interfaces that comply
with SONET or SDH standards, or other synchronous networks. Such
interoperation would require full conformance to the optical,
electrical, and logical requirements specified by SONET or SDH, and is
outside the scope and intent of this standard. Operation over
electrically multiplexed payloads of a transmission network is outside
the scope of this standard.
From the perspective of the 10 Gb/s MAC
layer, a 10GBASE-W PHY does not appear different (in either the
functions or service interface) from a PHY without a WIS, with the
exception of sustained data rate. However, a 10GBASE-W interface may
interoperate only with another 10GBASE-W interface.
Basically, the 10GBASE-W PHYs can interface seemlessly on top of a SONET network due to their slightly reduced data rate.
The long wave -R PHYs are also designed for WAN application but with Ethernet's native data rate (and they're probably much more common).
answered 7 mins ago
Zac67
21.9k21250
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
3
down vote
From IEEE 802.3 Clause 50.1: (emphasis mine)
The WAN Interface Sublayer (WIS) is an optional PHY sublayer that may
be used to create a 10GBASE-W PHY that is data-rate and format
compatible with the SONET STS-192c transmission format defined by
ANSI, as well as the Synchronous Digital Hierarchy (SDH) VC-4-64c
container specified by ITU. The purpose of the WIS is to allow
10GBASE-W equipment to generate Ethernet data streams that may be
mapped directly to STS-192c or VC-4-64c streams at the PHY level,
without requiring MAC or higher-layer processing. The WIS therefore
specifies a subset of the logical frame formats in the SONET and SDH
standards. In addition, the WIS constrains the effective data
throughput at its service interface to the payload capacity of
STS-192c / VC-4-64c, i.e., 9.58464 Gb/s. Multiplexed SONET/SDH formats
are not supported.
The WIS does not render a 10GBASE-W PHY compliant
with either SONET or SDH at any rate or format. A 10GBASE-W interface
is not intended to interoperate directly with interfaces that comply
with SONET or SDH standards, or other synchronous networks. Such
interoperation would require full conformance to the optical,
electrical, and logical requirements specified by SONET or SDH, and is
outside the scope and intent of this standard. Operation over
electrically multiplexed payloads of a transmission network is outside
the scope of this standard.
From the perspective of the 10 Gb/s MAC
layer, a 10GBASE-W PHY does not appear different (in either the
functions or service interface) from a PHY without a WIS, with the
exception of sustained data rate. However, a 10GBASE-W interface may
interoperate only with another 10GBASE-W interface.
Basically, the 10GBASE-W PHYs can interface seemlessly on top of a SONET network due to their slightly reduced data rate.
The long wave -R PHYs are also designed for WAN application but with Ethernet's native data rate (and they're probably much more common).
answered 7 mins ago
Zac67
21.9k21250
add a comment |Â
up vote
3
down vote
From IEEE 802.3 Clause 50.1: (emphasis mine)
The WAN Interface Sublayer (WIS) is an optional PHY sublayer that may
be used to create a 10GBASE-W PHY that is data-rate and format
compatible with the SONET STS-192c transmission format defined by
ANSI, as well as the Synchronous Digital Hierarchy (SDH) VC-4-64c
container specified by ITU. The purpose of the WIS is to allow
10GBASE-W equipment to generate Ethernet data streams that may be
mapped directly to STS-192c or VC-4-64c streams at the PHY level,
without requiring MAC or higher-layer processing. The WIS therefore
specifies a subset of the logical frame formats in the SONET and SDH
standards. In addition, the WIS constrains the effective data
throughput at its service interface to the payload capacity of
STS-192c / VC-4-64c, i.e., 9.58464 Gb/s. Multiplexed SONET/SDH formats
are not supported.
The WIS does not render a 10GBASE-W PHY compliant
with either SONET or SDH at any rate or format. A 10GBASE-W interface
is not intended to interoperate directly with interfaces that comply
with SONET or SDH standards, or other synchronous networks. Such
interoperation would require full conformance to the optical,
electrical, and logical requirements specified by SONET or SDH, and is
outside the scope and intent of this standard. Operation over
electrically multiplexed payloads of a transmission network is outside
the scope of this standard.
From the perspective of the 10 Gb/s MAC
layer, a 10GBASE-W PHY does not appear different (in either the
functions or service interface) from a PHY without a WIS, with the
exception of sustained data rate. However, a 10GBASE-W interface may
interoperate only with another 10GBASE-W interface.
Basically, the 10GBASE-W PHYs can interface seemlessly on top of a SONET network due to their slightly reduced data rate.
The long wave -R PHYs are also designed for WAN application but with Ethernet's native data rate (and they're probably much more common).
answered 7 mins ago
Zac67
21.9k21250
add a comment |Â
up vote
3
down vote
up vote
3
down vote
From IEEE 802.3 Clause 50.1: (emphasis mine)
The WAN Interface Sublayer (WIS) is an optional PHY sublayer that may
be used to create a 10GBASE-W PHY that is data-rate and format
compatible with the SONET STS-192c transmission format defined by
ANSI, as well as the Synchronous Digital Hierarchy (SDH) VC-4-64c
container specified by ITU. The purpose of the WIS is to allow
10GBASE-W equipment to generate Ethernet data streams that may be
mapped directly to STS-192c or VC-4-64c streams at the PHY level,
without requiring MAC or higher-layer processing. The WIS therefore
specifies a subset of the logical frame formats in the SONET and SDH
standards. In addition, the WIS constrains the effective data
throughput at its service interface to the payload capacity of
STS-192c / VC-4-64c, i.e., 9.58464 Gb/s. Multiplexed SONET/SDH formats
are not supported.
The WIS does not render a 10GBASE-W PHY compliant
with either SONET or SDH at any rate or format. A 10GBASE-W interface
is not intended to interoperate directly with interfaces that comply
with SONET or SDH standards, or other synchronous networks. Such
interoperation would require full conformance to the optical,
electrical, and logical requirements specified by SONET or SDH, and is
outside the scope and intent of this standard. Operation over
electrically multiplexed payloads of a transmission network is outside
the scope of this standard.
From the perspective of the 10 Gb/s MAC
layer, a 10GBASE-W PHY does not appear different (in either the
functions or service interface) from a PHY without a WIS, with the
exception of sustained data rate. However, a 10GBASE-W interface may
interoperate only with another 10GBASE-W interface.
Basically, the 10GBASE-W PHYs can interface seemlessly on top of a SONET network due to their slightly reduced data rate.
The long wave -R PHYs are also designed for WAN application but with Ethernet's native data rate (and they're probably much more common).
answered 7 mins ago
Zac67
21.9k21250
From IEEE 802.3 Clause 50.1: (emphasis mine)
The WAN Interface Sublayer (WIS) is an optional PHY sublayer that may
be used to create a 10GBASE-W PHY that is data-rate and format
compatible with the SONET STS-192c transmission format defined by
ANSI, as well as the Synchronous Digital Hierarchy (SDH) VC-4-64c
container specified by ITU. The purpose of the WIS is to allow
10GBASE-W equipment to generate Ethernet data streams that may be
mapped directly to STS-192c or VC-4-64c streams at the PHY level,
without requiring MAC or higher-layer processing. The WIS therefore
specifies a subset of the logical frame formats in the SONET and SDH
standards. In addition, the WIS constrains the effective data
throughput at its service interface to the payload capacity of
STS-192c / VC-4-64c, i.e., 9.58464 Gb/s. Multiplexed SONET/SDH formats
are not supported.
The WIS does not render a 10GBASE-W PHY compliant
with either SONET or SDH at any rate or format. A 10GBASE-W interface
is not intended to interoperate directly with interfaces that comply
with SONET or SDH standards, or other synchronous networks. Such
interoperation would require full conformance to the optical,
electrical, and logical requirements specified by SONET or SDH, and is
outside the scope and intent of this standard. Operation over
electrically multiplexed payloads of a transmission network is outside
the scope of this standard.
From the perspective of the 10 Gb/s MAC
layer, a 10GBASE-W PHY does not appear different (in either the
functions or service interface) from a PHY without a WIS, with the
exception of sustained data rate. However, a 10GBASE-W interface may
interoperate only with another 10GBASE-W interface.
Basically, the 10GBASE-W PHYs can interface seemlessly on top of a SONET network due to their slightly reduced data rate.
The long wave -R PHYs are also designed for WAN application but with Ethernet's native data rate (and they're probably much more common).
answered 7 mins ago
Zac67
21.9k21250
answered 7 mins ago
Zac67
21.9k21250
answered 7 mins ago
Zac67
21.9k21250
answered 7 mins ago
Zac67
21.9k21250
21.9k21250
add a comment |Â
add a comment |Â
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1
I think you are trying to compare two completely different protocols: ethernet and SONET. Ethernet is an IEEE protocol (802.3), but SONET is an ITU protocol, originally designed for telephone virtual circuits, but it also often used for data WAN.
– Ron Maupin♦
47 mins ago