United States
Q
What is a Cisco 25G optical module?
A
A Cisco 25G optical module is a pluggable transceiver designed for 25 Gigabit Ethernet applications, converting electrical signals to optical signals for high-speed data transmission.
Q
Which form factors are available for Cisco 25G optical modules?
A
Cisco 25G optical modules are available in SFP28 form factor for single-lane links and QSFP28 breakout modules supporting four 25G lanes from a single port.
Q
What types of Cisco 25G optical modules does Cisco offer?
A
Cisco offers 25G SR (Short Reach), LR (Long Reach), and PSM4 modules, each supporting different distances over multimode or single-mode fiber.
Q
What is the maximum transmission distance for Cisco 25G SR modules?
A
Cisco 25G SR modules support up to 100 meters over OM3 multimode fiber and up to 70 meters over OM4 fiber at 850 nm wavelength.
Q
How far can Cisco 25G LR modules transmit data?
A
Cisco 25G LR modules support distances up to 10 kilometers over single-mode fiber at 1310 nm wavelength.
Q
Which Cisco switches support 25G optical modules?
A
Cisco 25G optical modules are supported on Nexus 9000, Nexus 3000, Catalyst 9500, Catalyst 9300, and UCS Fabric Interconnect series.
Q
Are Cisco 25G optical modules compatible with third-party optics?
A
Cisco 25G optical modules are Cisco-tested and validated; third-party optics may work but are not covered under Cisco warranties or support agreements.
Q
How do I install a Cisco 25G optical module?
A
To install, align the module with the switch port, gently insert until it clicks, then attach the LC or MPO patch cable according to the module type.
Q
How can I verify my Cisco 25G optical module is operational?
A
Use the ‘show interface transceiver details’ CLI command to check module status, temperature, voltage, and receive/transmit power levels.
Q
What is the typical power consumption of a Cisco 25G SFP28 module?
A
Cisco 25G SFP28 modules consume approximately 1.2 to 1.5 watts under normal operating conditions per port.
Q
What wavelength do Cisco 25G optical modules use?
A
Cisco 25G SR modules operate at 850 nm and LR/ER modules at 1310 nm, while PSM4 uses multiple 1310 nm lanes in a MPO connector.
Q
What is the difference between 25G SR and 25G LR modules?
A
25G SR modules are multimode optics for short distances (up to 100 m), while 25G LR modules are single-mode optics for distances up to 10 km.
Q
Can I use Cisco 25G direct attach cables instead of optical modules?
A
Direct attach cables (DAC) provide low-cost, short-reach connectivity up to 10 m, whereas optical modules with fiber support longer distances and flexible upgrades.
Q
How do I troubleshoot link issues with Cisco 25G modules?
A
Check transceiver diagnostics with ‘show interface transceiver’, verify fiber cleanliness, replace faulty cables, and confirm switch port configuration.
Q
How do I update the firmware on Cisco 25G optical modules?
A
Cisco 25G modules are typically firmware-free; module behavior is coordinated via the switch IOS or NX-OS software which you update through standard image upgrade procedures.
Q
What warranty and support options are available for Cisco 25G modules?
A
Cisco 25G optical modules come with a one-year limited hardware warranty; extended support is available through Cisco SMARTnet or Cisco Solution Support contracts.
