Cisco 25 Gigabit Direct Attach Cable SFP-H25G-CU4M

Product overview

The Cisco^® 25GBASE SFP28 (Small Form-Factor Pluggable) portfolio offers customers a wide variety of high-density and low-power 25 Gigabit Ethernet connectivity options for data center and high-performance computing networks applications. The 25G Modules are based on SFP28 form factor.

25G Direct Attached Cables (DAC)

25G Active Optical Cables (AOC)

25G Short Reach (SR) Module

10/25G Cisco Short Reach (CSR) Module

10/25G Long Reach (LR) Module

10/25G Long Reach (LR) Industrial Temperature Module

SFP-10/25G-BXD-I

SFP-10/25G-BXU-I

SFP-25G-ER-I

SFP-25G-BX40D-I

SFP-25G-BXU-I

Features and benefits of Cisco 25G Modules

●     Interoperable with other IEEE-compliant 25G interfaces where applicable.

●     Certified and tested on Cisco SFP28 ports for superior performance, quality, and reliability.

●     High-speed connectivity compliant to IEEE 802.3by and IEEE 802.3cc.

Table 1.           Cisco 25G Portfolio

Cisco SFP-25G copper cables

Cisco SFP28 to SFP28 copper direct-attach 25GBASE-CR1 cables are suitable for very short links and offer a highly cost-effective way to establish a 25-Gigabit link between SFP28 ports of Cisco switches within racks and across adjacent racks. Cisco offers passive copper cables in lengths of x= 1, 1.5, 2, 2.5, 3, 4 and 5 meters.

1m, 1.5m, and 2m cables do not require FEC on the host ports; 2.5m and 3m cables require BASE-R FEC (also known as FC-FEC) on the host ports; 4m and 5m cables require RS-FEC on the host ports.

Cisco SFP-25G active optical cables

Cisco SFP28 to SFP28 Active Optical Cables are direct-attach fiber assemblies with SFP connectors. They are suitable for very short distances and offer a cost-effective way to connect within racks and across adjacent racks. Cisco offers Active Optical Cables in lengths of 1, 2, 3, 4, 5, 7, and 10 meters.

AOC cable require BASE-R FEC, or RS-FEC on the host ports.

Cisco SFP-25G-SR-S

The Cisco 25GBASE-SR Module supports a link length of 70/100m on OM3/4 MMF.

This module requires RS-FEC on the host ports.

Cisco SFP-25G-SL

The Cisco 25GBASE-SL Module supports a link length of 20/30m on OM3/4 MMF.

The Cisco SFP-25G-SL (Short Link) module requires RS-FEC on the host ports

Cisco SFP-10/25G-CSR-S

The Cisco 10/25GBASE-CSR Module supports a link length of up to 300/400m over OM3/4 at 10G, and up to 300/400m over OM3/4 at 25G^*. It also supports link lengths of 82m over OM2 at 10G, and up to 70m over OM2 at 25G.

This module requires RS-FEC on the host port for full reach operation at 25G. Using BASE-R FEC the module can support 70/100m over OM3/4 and with-out FEC it can support 30/50m over OM3/4 at 25G*. For 10G operation FEC is not required.

^*Depends upon fiber quality.

Cisco SFP-10/25G-LR-S

The Cisco 10/25GBASE-LR Module supports a link length of 10 kilometers on standard Single-Mode Fiber (SMF) G.652 at both 10G and 25G.

This module requires RS-FEC on the host ports for operation at 25G.

Cisco SFP-10/25G-LR-I

The Cisco 10/25GBASE-LR Module supports a link length of 10 kilometers on standard Single-Mode Fiber (SMF) G.652 at both 10G and 25G. The module requires RS-FEC on the host ports for full reach operation at 25G. This module has an industrial temperature range. This module also supports CPRI datarates options 7, 8, 9 and 10.

In some applications using BASE-R FEC the module can support 3.5km and without FEC it can support 1.5km, depending on fiber quality.

Cisco SFP-10/25G-BXD-I and SFP-10/25G-BXU-I (single-fiber bidirectional applications)

The Cisco 10GBASE-LR/10GBASE-BR/25GBASE-BR Module supports a link length of 10 kilometers on a single strand of standard Single-Mode Fiber (SMF) G.652 at both 10G and 25G. A SFP-10/25G-BXD-I device is always connected to a SFP-10/25G-BXU-I device with a single strand of standard SMF. The communication over a single strand of fiber is achieved by separating the transmission wavelength of the two devices. SFP-10/25G-BXD-I transmits at 1330nm channel and receives at 1270nm signal. The SFP-10/25G-BXU-I transmits at a 1270nm wavelength and receives a 1330nm signal.

The module requires RS-FEC on the host ports for full reach operation at 25G. This module has an industrial temperature range. This module also supports CPRI datarates options 7, 8, 9 and 10.

In some applications using BASE-R FEC the module can support 3.5km and without FEC it can support 1.5km, depending on fiber quality.

Cisco SFP-25G-ER-I

The Cisco 25GBASE-ER Module supports a link length of 40 kilometers on standard Single-Mode Fiber (SMF) G.652 at 25G.

The module requires RS-FEC on the host ports for full reach operation at 25G. This module has an industrial temperature range.

Cisco SFP-25G-BX40D-I and SFP-25G-BX40U-I (single-fiber bidirectional applications)

The Cisco 25GBASE-BR40 Modules support link lengths of 40km over a single strand of standard Single-Mode Fiber (SMF) G.652 at 25G. An SFP-25G-BX40D-I device is always connected to an SFP-25G-BX40U-I device with a single strand of standard SMF. The communication over a single strand is achieved by separating the transmission wavelength of the two devices. SFP-25G-BX40D-I transmits at 1314nm wavelength and receives at 1289nm wavelength. The SFP-25G-BX40U-I transmits at 1289nm and receives at 1314nm wavelengths.

These modules require RS-FEC on the host ports for full reach operation at 25G. These modules have an industrial temperature range.

Technical specifications

Platform support

Cisco 25G transceivers are supported on Cisco switches. For more details, refer to the document “Transceiver Module Group (TMG) Compatibility Matrix”.

Connectors and cabling

Refer to Table 2 for cabling specifications for each 25G product.

Table 2.           25G Port cabling specifications

Table 3.           SFP28 port cabling specifications

Table 4.           Optical transmit and receive specifications

Connectors: Dual LC/PC connector (SFP-25G-SR-S, SFP-10/25G-CSR-S SFP-10/25G-LR-S, SFP-10/25G-LR-I and SFP-25G-ER-I).

Fiber Channel over Ethernet: The 25G DAC’s (SFP-H25G-CUxxM), AOC’s (SFP-25G-AOCxxM) and transceivers (SFP-25G-SR-S, SFP-10/25G-CSR-S and SFP-10/25G-LR-S) support FCoE with the appropriate host s/w support.

Note:       Only connections with patch cords with PC or UPC connectors are supported. Patch cords with APC connectors are not supported. All cables and cable assemblies used must be compliant with the standards specified in the standards section.

Environmental conditions

Operating temperature range:

●     Commercial temperature range: 0 to 70°C (32 to 158°F)

●     Industrial temperature range: -40 to 85°C (-40 to 185°F)

●     Storage temperature range: -40 to 85°C (-40 to 185°F)

Ordering information

Table 5 provides the ordering information for Cisco 25G cables and transceivers.

Table 5.           Ordering information

Regulatory and standards compliance

Standards:

●     SFF-8402: SFP+ 28 Gb/s 1x Pluggable Transceiver Solution (SFP28) - Rev 1.0 March 30, 2014.

●     SFF-8472: Diagnostic Monitoring Interface for Optical Transceivers - Rev 12 August 29, 2014.

●     IEEE 802.3^™ - 2015 IEEE Standard for Ethernet.

●     IEEE P802.3by^™ - 2016 Amendment 2: Media Access Control Parameters, Physical Layers, and Management Parameters for 25 Gb/s Operation.

●     IEEE P802.3cc^™ - 2017 Amendment 11: Physical Layer and Management Parameters for Serial 25 Gb/s Ethernet Operation Over Single-Mode Fiber.

●     IEEE P802.3cp - Clause 159 Physical Layer specification for a 25Gb/s bidirectional link over one singe-mode fiber with reach up to 40km.

●     RoHS 6

Safety:

●     Laser Class 1 21CFR-1040 LN#50 7/2001

●     Laser Class 1 IEC60825-1

●     Cable jacket of SFP copper modules is UL E116441 Compliant

●     SFP copper cables are ELV Compliant

Additional information

For more information about Cisco 25GBASE SFP28 optics and copper modules, contact your sales representative or visit https://www.cisco.com/c/en/us/products/interfaces-modules/25-gigabit-modules/index.html.