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Compatibility of Cisco SFP-1G-LH Optical Module

Time: 2025-07-18
        Cisco releases the optical module model SFP-1G-LH, which supports 1G rate connection over 10G switch interfaces. Moduletek Laboratory has conducted sample testing on this module to help users understand its actual application performance.
1. Product Overview
        The Cisco SFP-1G-LH module works on 10G-rate ports, but is incompatible with ports that only support 1G speed. Its official specifications and physical appearance are shown below.
Table 1 SFP-1G-LH Product Information
  Product Description
  Product Number
  1000BASE-LX/LH long wavelength module for 10GE ports
  SFP-1G-LH
1000BASE-LX / LH SFP for single mode fiber and multimode fiber
THE SFP-1G-LH module operates in 10G, 10/25G dual rate and 10/25/50G tri-rate ports of Cisco switches and routers but provides 1G connectivity . The SFP-1G-LH interoperates with 1000BASE-LX/LH modules.
The SFP -1G- LH module will only operate in 10G capable ports and will not operate in 1G only ports.
SFP-1G-LH Physical Demonstration
Figure 1 SFP-1G-LH Physical Demonstration
2. Module Practical Performance Test
        The SFP-1G-LH module was inserted into a Cisco C9500X-60L40 switch running IOS XE 17.14.01. The SFP ports on this device support 10/25/50G rate.
        We used optical fiber to connect it with the GLC-LH-SMD module on a Cisco WS-C3560CX-8XPD-S switch. The link established normally at 1G speed and data transmission worked stably.
        The switch can correctly identify module information such as model and serial number; no alarm is generated, and DOM data displays normally.
Table 2 SFP-1G-LH On-Site Test Result
Item

Information Read by Switch
Indicator Lights
LINK
Identification
DOM Data
3. Compatible Switch Platforms
        Not all Cisco 10G switches support the SFP-1G-LH module. Referring to Cisco official documents, Moduletek Laboratory sorts out the compatible device platforms and minimum software version requirements as follows:
Table 3 SFP-1G-LH Compatible Device List
Device Series Device Model Minimum Software Version
Requirement		 Notes
C9500
C9500X-60L4D
IOS XE 17.14.1
 
ASR9000
ASR-9903
IOS XR 64 Bit 7.5.2
 
ASR9000
A9K-4HG-FLEX-TR
IOS XR 64 Bit 7.5.2
 
ASR9000
A9K-4HG-FLEX-SE
IOS XR 64 Bit 7.5.2
 
ASR9000
A99-4HG-FLEX-TR
IOS XR 64 Bit 7.5.2
 
ASR9000
A99-4HG-FLEX-SE
IOS XR 64 Bit 7.5.2
 
ASR9000
ASR-9902
IOS XR 64 Bit 7.5.2
 
ASR9000
A9903-8HG-PEC
IOS XR 64 Bit 7.5.2
 
ASR9000
ASR-9903-FC
IOS XR 64 Bit 7.5.2
 
ASR9000
ASR-9902-FC
IOS XR 64 Bit 7.5.2
 
ASR9000
A9K-4HG-FLEX-FC
IOS XR 64 Bit 7.5.2
 
ASR9000
A99-4HG-FLEX-FC
IOS XR 64 Bit 7.5.2
 
ASR9000
A9903-8HG-PEC-FC
IOS XR 64 Bit 7.5.2
 
C9600
C9600-LC-48YL
IOS XE 17.14.1
 
C9600
C9600-LC-40YL4CD
IOS XE 17.14.1
 
C9600
C9600X-LC-56YL4C
IOS XE 17.14.1
 
8000 Series
86-MPA-24Z-M
IOS XR 24.4.1
 
C9400X
C9400X-SUP-2
IOS XE 17.15.1
 
C9400X
C9400X-SUP-2XL
IOS XE 17.15.1
 
        Notes:
            1. When deploying the SFP-1G-LH module, keep the duplex mode consistent at both ends of the link.
            2. This compatible device list is valid as of the publication date. New models may be added subsequently; please check the official Cisco website for the latest compatibility information.
        Actual verification shows that the field performance of this module is consistent with Cisco official specifications.
        Moduletek is at your service.
        For further inquiries about the above content, please contact us at: sales@moduletek.com
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