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40G Cabling Technical Q&A Document

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Arista 40G Cabling and Transceivers: Q&A

40Gigabit Cables and Transceivers

Q. What 40G cables and transceivers are available from Arista?

A. Arista supports a full range of both copper cables and optical transceivers for 40GbE, compliant

to the IEEE standards. For copper both QSFP+ to QSFP+ (40G to 40G) and QSFP+ to SFP+ (40G

to 4x10G) cables enable short reach options. For longer distances Arista offers a wide range of

optical transceivers for various fiber types and reach requirements.

Product Number

Product Description

40GbE Transceivers

QSFP-40G-SR4

40GBASE-SR4 QSFP+ transceiver, up to 100m over parallel OM3 or 150m over

OM4 multi-mode fiber

QSFP-40G-XSR4

40GBASE-XSR4 QSFP+ transceiver, up to 300m over parallel OM3 or 400m over

OM4 multi-mode fiber

QSFP-40G-UNIV

40G Universal QSFP+ transceiver, up to 150m over duplex OM3 or OM4 fiber, 500m

over duplex single-mode fiber

QSFP-40G-PLRL4

40G QSFP+ optic, up to 1km over parallel SMF (4x10G LR up to 1km) MTP-12

QSFP-40G-PLR4

40G QSFP+ optic, up to 10km over parallel SMF (4x10G LR up to 10km) MTP-12

QSFP-40G-LRL4

40GBASE-LR4 QSFP+ transceiver, up to 1km over single-mode fiber

QSFP-40G-LR4

40GBASE-LR4 QSFP+ transceiver, up to 10km over single-mode fiber

4 x 10GbE QSFP+ to 4 x SFP+ Twinax Copper Cables

CAB-Q-S-0.5M

4 x 10GbE QSFP+ to 4 x SFP+ twinax copper cable, 0.5M

CAB-Q-S-1M

4 x 10GbE QSFP+ to 4 x SFP+ twinax copper cable, 1M

CAB-Q-S-2M

4 x 10GbE QSFP+ to 4 x SFP+ twinax copper cable, 2M

CAB-Q-S-3M

4 x 10GbE QSFP+ to 4 x SFP+ twinax copper cable, 3M

CAB-Q-S-5M

4 x 10GbE QSFP+ to 4 x SFP+ twinax copper cable, 5M

40GbE QSFP+ to QSFP+ Twinax Copper Cables

CAB-Q-Q-0.5M

40GbE QSFP+ to QSFP+ twinax copper cable, 0.5M

CAB-Q-Q-1M

40GbE QSFP+ to QSFP+ twinax copper cable, 1M

CAB-Q-Q-2M

40GbE QSFP+ to QSFP+ twinax copper cable, 2M

CAB-Q-Q-3M

40GbE QSFP+ to QSFP+ twinax copper cable, 3M

CAB-Q-Q-5M

40GbE QSFP+ to QSFP+ twinax copper cable, 5M

CAB-Q-Q-7M

40GbE QSFP+ to QSFP+ twinax copper cable, 7M

40GbE QSFP+ to QSFP+ Active Optical Cables

AOC-Q-Q-40G-3M

QSFP+ to QSFP+ 40GbE Active Optical Cable 3 meter

AOC-Q-Q-40G-5M

QSFP+ to QSFP+ 40GbE Active Optical Cable 5 meter

AOC-Q-Q-40G-7M

QSFP+ to QSFP+ 40GbE Active Optical Cable 7 meter

AOC-Q-Q-40G-10M

QSFP+ to QSFP+ 40GbE Active Optical Cable 10 meter

AOC-Q-Q-40G-15M

QSFP+ to QSFP+ 40GbE Active Optical Cable 15 meter

AOC-Q-Q-40G-20M

QSFP+ to QSFP+ 40GbE Active Optical Cable 20 meter

AOC-Q-Q-40G-25M

QSFP+ to QSFP+ 40GbE Active Optical Cable 25 meter

AOC-Q-Q-40G-30M

QSFP+ to QSFP+ 40GbE Active Optical Cable 30 meter

AOC-Q-Q-40G-50M

QSFP+ to QSFP+ 40GbE Active Optical Cable 50 meter

AOC-Q-Q-40G-75M

QSFP+ to QSFP+ 40GbE Active Optical Cable 75 meter

AOC-Q-Q-40G-100M

QSFP+ to QSFP+ 40GbE Active Optical Cable 100 meter

Summary of content (10 pages)

PAGE 1
40G Cabling Technical Q&A Document Arista 40G Cabling and Transceivers: Q&A 40Gigabit Cables and Transceivers Q. What 40G cables and transceivers are available from Arista? A. Arista supports a full range of both copper cables and optical transceivers for 40GbE, compliant to the IEEE standards. For copper both QSFP+ to QSFP+ (40G to 40G) and QSFP+ to SFP+ (40G to 4x10G) cables enable short reach options.
PAGE 2
40G Cabling Technical Q&A Document Additional optics and cables may be released in future. Q. What is the 40GbE max supported distances? A. The IEEE 40GBASE-X standard describes the following: • • • • 40GBASE-SR4 supports up to 100m on OM3, and 150m on OM4. There is no support for OM2 or OM1 (these are considered legacy). 40GBASE-LR4 supports up to 10km on 9u SM fiber (same fiber used for 10G single mode 10GBASE-LR). 40GBASE-CR4 supports up to 7m.
PAGE 3
40G Cabling Technical Q&A Document of connector for MTP-12 cables but this does not exist in the market for single-mode fiber. APC is the only available choice for single-mode MTP-12 fiber. Q. Can a customer use third party QSFP+ to QSFP+ and SFP+ cables? A. Arista does not restrict the use of third party copper cables. These cables need to comply with the IEEE specifications, to allow them to be correctly recognized by the Arista switch. Interfaces with cables not recognized correctly will be disabled.
PAGE 4
0G Cabling Technical Q&A Document In many existing DC environments LC-MTP cables are used to support high density fiber trunks between switches, rack patch panels and main distribution cabling panels (MDA) as shown below: An example cable diagram from Corning is shown below for an MTP12-4xLC harness assembly with a set of part numbers in the table below.
PAGE 5
40G Cabling Technical Q&A Document Q. What is the specification for the MTP-LC cable? A. According to the IEEE 40GBASE-SR4 specifications, the 40G signal is carried over a single MTP-12 fiber, with only 8 of the 12 fibers used, where the remaining four are not used, and can optionally be not present in the cable (to save cost). The specific mapping of Tx and Rx ports to fiber strands is defined in the standard, with 1-4, and 9-12 used as shown below. This would be an MTP-12 to an MTP-12.
PAGE 6
40G Cabling Technical Q&A Document Q. What is the specification for the QSFP+ to QSFP+ cable? A regular MTP-12 to MTP-12 cable as shown below is also used for direct 40G to 40G connections. At the MTP ends there are 12 fibers (an MTP-12), and two guide pins (or sockets), which can be seen in the photograph below.
PAGE 7
40G Cabling Technical Q&A Document Q. Where else can the MTP-12 and MTP-24 cables be purchased? To enable customers to rapidly test and implement a whole variety of 40G and 100G interfaces a range of fiber cables can be ordered directly from Arista Networks. These cables come in a choice of 3m (12’) and 5m (15’), which addresses the most common lengths needed for small installations or when doing product evaluation and testing.
PAGE 8
40G Cabling Technical Q&A Document Q. What other options are available apart from break-out cables? Using an MTP-LC fan-out with an MTP-12 at one end, a 40G interface can be adapted from one port of 40G into 4x10G and uses the same cabling to convert multiple 10G links into a single cable. In addition to using a fan-out cable, there are also a number of cabling system solutions that use a “cassette” style system to break out the MTP into individual LC pairs (as below - (1) MTP-12 into (6) LC pairs).
PAGE 9
40G Cabling Technical Q&A Document Arista 40GbE Product Configuration: Q. How do you change the QSFP+ ports to support 10G or 40G mode? A. On all Arista switches with 40GbE ports the QSFP+ ports can support 4x10G or 1x40G on any port (independently configurable).
PAGE 10
40G Cabling Technical Q&A Document In 4.8 and later the command was deprecated. Q. How are the 7050Q shared QSFP+ ports changed to the SFP+ ports? A. By default the Arista 7050Q has the 8 SFP+ ports disabled, and they must be enabled before being used. There is a hardware command to activate the SFP+ ports, and disable the associated QSFP+ ports.