The range of Cisco® 10GBASE XENPAK modules offers a wide variety of 10 Gigabit Ethernet connectivity options for data center, enterprise wiring closet, and service provider transport applications (Figure 1).
Figure 1. Cisco 10GBASE XENPAK Modules
Main features of Cisco 10GBASE XENPAK modules include:
• Supports 10GBASE Ethernet
• Hot-swappable input/output device plugs into an Ethernet XENPAK port of a Cisco switch or router to link the port with the network
• Provides flexibility of interface choice
• Supports "pay-as-you-populate" model
• Supports the Cisco quality identification feature that enables a Cisco switch or router to identify whether the module is a Cisco certified and tested XENPAK module
• Interoperable with respective Cisco 10-Gigabit X2, XFP and SFP+ modules on the same link
Cisco offers six modules in this product family:
• Cisco XENPAK-10GB-CX4: Supports link lengths of up to 15m on CX4 cable.
• Cisco XENPAK-10GB-LRM: Supports link lengths 220m on standard FDDI-grade multimode fiber (MMF). To ensure that specifications are met over FDDI-grade, OM1 and OM2 fibers, the transmitter should be coupled through a mode conditioning patch cord. No mode conditioning patch cord is required for applications over OM3. For additional information on mode conditioning patch cord requirements please see: http://www.cisco.com/en/US/prod/collateral/modules/ps5455/product_bulletin_c25-530836.html.
The Cisco 10GBASE-LRM Module also supports link lengths of 300m on standard single-mode fiber (SMF, G.652).
• Cisco XENPAK-10GB-SR: Supports a link length of 26m on standard FDDI grade MMF. Up to 300m link lengths are possible when using 2000 MHz/km MMF (OM3). Up to 400m link lengths are possible when using 4700 MHz/km MMF (OM4).
• Cisco XENPAK-10GB-LR+: Supports a link length of 10 km on standard single-mode fiber (SMF) (G.652).
• Cisco XENPAK-10GB-ER+: Supports a link length of up to 40 km on SMF (G.652).
• Cisco XENPAK-10GB-ZR: Supports link lengths of up to about 80 km on SMF. This interface is not part of the 10 Gigabyte Ethernet standard but is built according to Cisco optical specifications.
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.
Table 1 provides cabling specifications for the Cisco XENPAK modules.
Table 1. XENPAK Port Cabling Specifications
Core Size (micron)
Modal Bandwidth (MHz/km)
Cisco XENPAK-10GB-ER+ ***
Operates on any SMF type
* Minimum cabling distance for optical XENPAK modules (-LX4, -SR, -LR, -ER) is 2m, according to the IEEE 802.3ae standard, and minimum cabling distance for -LRM modules is 0.5m, according to IEEE 802.3aq standard.
** Data based on standard G.652 SMF. Even though dispersion-shifted fiber enables reducing signal dispersion to travel longer distances, the signal attenuation still limits its distance.
*** Requires 5 dB 1550 nm fixed loss attenuator for < 20 km. Attenuator is available as a spare. The part number is WS-X6K-5DB-ATT=.
**** Links longer than 30 km are considered engineered links.
Table 2 shows the main optical characteristics for the Cisco XENPAK modules. The Cisco XENPAK-10GB-CX4 is not an optical module and therefore is not listed in the table.
Table 2. Optical Transmit and Receive Specifications for IEEE 802.3 standard compliant modules
Transmit Power (dBm)
Receive Power (dBm)
Transmit and Receive Wavelength range (nm)
10GBASE-LRM 1300nm MMF
-8.4 (in average) and -6.4 (in OMA)**
1260 to 1355
850 nm MMF
840 to 860
1310 nm SMF
1260 to 1355
1260 to 1565***
1550 nm SMF
1530 to 1565
1260 to 1565***
* The launch power shall be the lesser of the class 1 safety limit or the maximum receive power. Class 1 laser requirements are defined by IEC 60825-1: 2001
** Both average and OMA specifications need to be met simultaneously
*** Even though the receiver can tolerate a wide wavelength range, the specifications are guaranteed for a signal within the transmit wavelength range
Table 3 details optical specifications for the Cisco XENPAK-10GB-ZR modules.
Table 3. XENPAK-10GB-ZR Optical Parameters
Notes and Conditions
Side-mode suppression ratio
Transmitter extinction ratio
Transmitter optical output power
Average power coupled into single-mode fiber
Receiver optical input wavelength
Receiver damage threshold
Optical input power
At bit error rate (BER) = 10e -12 with IEEE 802.3 test pattern
Dispersion power penalty at 1600 ps/nm
At bit error rate (BER) = 10e-12 with IEEE 802.3 test pattern
Note: Parameters are specified over temperature and at end of life unless otherwise noted. When shorter distances of single-mode fiber are used, an inline optical attenuator must be used to avoid overloading and damaging the receiver.
Dimensions (DxWxH): 4.76" x 1.42" x 0.47" (121 x 36 x 18 mm). Cisco XENPAK modules typically weigh less than 300 g.
Environmental Conditions and Power Requirements
• Operating temperature range is between 0 and 40°C (32 to 104°F); storage temperature range is -40 to 75°C (-40 to 167°F).
• Maximum power consumption per Cisco XENPAK module is 8W.
• Standard warranty: 90 days
• Extended warranty (optional): Cisco XENPAK modules can be covered in a Cisco SMARTnet® support contract for the Cisco switch or router chassis
Table 4 provides the ordering information for Cisco XENPAK modules and related cables.
Table 4. Ordering Cisco XENPAK Modules and Respective Cables