The Optical Module Compatibility Of Cisco SFP-1G-LH

CISCO has an optical module product with the model number SFP-1G-LH, which supports 1G connections on 10G switch interfaces. The Moduletek Laboratory tested a sample of this product to help everyone better understand its actual performance when used in practice.

1. Product Overview

The Cisco SFP-1G-LH module is compatible with 10G ports but not with ports operating at only 1G speeds . The official description and physical appearance of the module are as follows:

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.

Figure 1 SFP-1G-LH Physical Demonstration

2. Module Performance in Use

The SFP-1G-LH module was connected to a Cisco C9500X-60L40 switch (version: IOS XE 17.14.01), the SFP ports of this switch support 10/25/50G. The module can establish a normal link at 1G speed and successfully transmit data after using fiber optical fiber to connect to the GLC-LH-SMD module on the Cisco WS-C3560CX-8XPD-S switch ; the module information is correctly recognized by the switch, such as module type and serial number, with no alarms and DOM data is normal.

Table 2 SFP-1G-LH On-Site Testing

Item	Switch Reads Information
Indicator Lights
LINK
Identify
DOM

3. Which switchs support the module?

Not all 10-Gigabit switches of CISCO brand support the SFP-1G-LH module. Based on official CISCO documentation, Moduletek Laboratory has compiled the following list of platforms that support the use of the SFP-1G-LH module.

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 using the SFP-1G-LH module, ensure that the duplex modes at both ends of the link are configured consistently;

2. The compatible device list is current as of the date of publication; new models may be added in the future. Please refer to the Cisco official website for the latest information.

Based on actual testing, the module's performance on switches aligns with Cisco's official claims.

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