Optical carrier is a standardized set of specifications of transmission speeds that describe a range of digital signals that can be carried on synchronous optical networking (SONET) fiber optic networks.^[1] The number attached to the optical carrier abbreviation, e.g., OC-48, is directly proportional to the data rate of the bitstream of the digital signal.

The rule for calculating the speed of optical-carrier-classified lines is that a specification given as OC-n designates a speed of n × 51.84 Mbit/s.^[2]

Contents 1 Optical carrier specifications 1.1 OC-1 1.2 OC-3 / STM-1x 1.3 OC-3c 1.4 OC-12 / STM-4x 1.5 OC-24 1.6 OC-48 / STM-16x / 2.5G SONET 1.7 OC-96 1.8 OC-192 / STM-64x / 10G SONET 1.9 OC-768 / STM-256x 2 References

[edit] Optical carrier specifications

Optical carrier classifications are based on the abbreviation OC followed by a number specifying a multiple of 51.84 Mbit/s: n × 51.84 Mbit/s => OC-n. For example, an OC-3 transmission medium has 3 times the transmission capacity of OC-1.

[edit] OC-1

OC-1 is a SONET line with transmission speeds of up to 51.84 Mbit/s (payload: 50.112 Mbit/s; overhead: 1.728 Mbit/s) using optical fiber.

[edit] OC-3 / STM-1x

OC-3 is a network line with transmission speeds of up to 155.52 Mbit/s (payload: 148.608 Mbit/s; overhead: 6.912 Mbit/s, including path overhead) using fiber optics. Depending on the system OC-3 is also known as STS-3 (electrical level) and STM-1 (SDH).

When OC-3 is not multiplexed by carrying the data from a single source, the letter c (standing for concatenated) is appended: OC-3c.

[edit] OC-3c

OC-3c ("c" stands for "concatenated") concatenates three STS-1(OC-1) frames into a single OC-3 look alike stream. The three STS-1 (OC-1) streams interleaved with each other such that the first column is from the first stream, the second column is from the second stream, and the third is from the third stream. Concatenated STS(OC) frames carry only one column of path overhead because they cannot be divided into finer granularity signals. Hence, OC-3c can transmit more payload to accommodate a CEPT-4 139.264 Mbit/s signal. The payload rate is 149.76 Mbit/s and overhead is 5.76 Mbit/s.

[edit] OC-12 / STM-4x

OC-12 is a network line with transmission speeds of up to 622.08 Mbit/s (payload: 601.344 Mbit/s; overhead: 20.736 Mbit/s).

OC-12 lines are commonly used by ISPs as WAN connections. While a large ISP would not use an OC-12 as a backbone (main link), it would for smaller, regional or local connections. This connection speed is also often used by mid-sized (below Tier 2) internet customers, such as web hosting companies or smaller ISPs buying service from larger ones.

[edit] OC-24

OC-24 is a network line with transmission speeds of up to 1244.16 Mbit/s (payload: 1202.208 Mbit/s; overhead: 41.472 Mbit/s). Implementations of OC-24 in commercial deployments are rare.

[edit] OC-48 / STM-16x / 2.5G SONET

OC-48 is a network line with transmission speeds of up to 2488.32 Mbit/s (payload: 2405.376 Mbit/s; overhead: 82.944 Mbit/s).

With usually cheap interface prices and being faster than OC-3, OC-12 connections, and even surpassing gigabit Ethernet, OC-48 connections are used as the backbones of many regional ISPs. Interconnections between large ISPs for purposes of peering or transit are quite common. As of 2005, the only connections in widespread use that surpass OC-48 speeds are OC-192 and 10 gigabit Ethernet.

OC-48 is also used as transmission speed for tributaries from OC-192 nodes in order to optimize card slot utilization where lower speed deployments are used. Dropping at OC-12, OC-3 or STS-1 speeds are more commonly found on OC-48 terminals, where use of these cards on an OC-192 would not allow for full use of the available bandwidth.

[edit] OC-96

OC-96 is a network line with transmission speeds of up to 4976.64 Mbit/s (payload: 4810.752 Mbit/s; overhead: 165.888 Mbit/s). Implementations of OC-96 in commercial deployments are rare, if ever used at all.

[edit] OC-192 / STM-64x / 10G SONET

OC-192 is a network line with transmission speeds of up to 9953.28 Mbit/s (payload: 9621.504 Mbit/s; overhead: 331.776 Mbit/s).

A standardized variant of 10 gigabit Ethernet (10GbE), called WAN-PHY, is designed to inter-operate with OC-192 transport equipment while the common version of 10GbE is called LAN-PHY (which is not compatible with OC-192 transport equipment in its native form). The naming is somewhat misleading, because both variants can be used on a wide area network.

As of 2005, OC-192 connections are most common for use on backbones of large ISPs.

[edit] OC-768 / STM-256x

OC-768 is a network line with transmission speeds of up to 39,813.12 Mbit/s (payload: 38,486.016 Mbit/s; overhead: 1,327.104 Mbit/s).

On October 23, 2008, AT&T announced the completion of upgrades to OC-768 on 80,000 fiber-optic wavelength miles of their IP/MPLS backbone network.^[3] OC-768 SONET interfaces have been available with short-reach optical interfaces from Cisco since as early as 2006. Infinera made a field trial demonstration data transmission on a live production network involving the service transmission of a 40 Gbit/s OC-768/STM-256 service over a 1,969 km terrestrial network spanning Europe and the U.S. In November 2008, an OC-768 connection was successfully brought up on the TAT-14/SeaGirt transatlantic cable,^[4] with the longest hop being 7,500km.

[edit] References

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