Specifications: 
Compatible Cisco P/N: GLC-T(10/100/1000)/ SFP-GE-T(10/100/1000)
1000BASE-T SFP transceiver module for Category 5e copper wire, RJ-45 connector 
Form Factor: SFP 
Data Rate: 10/100/1000M
Reach: 100m 
Fiber Type: CAT5E 
DDM/DOM: No 
Temp. Range(°C): 0~70

How to decide if you need to buy a 10/100/1000base-t sfp module or a pure 1000base-t sfp module ?

1. Which one to choose depends on if the switch support SGMII interface or SERDES interface. 
Case 1: When the switch supports SGMII interface, you need to choose 10/100/1000 multi rate sfp-t module. 
Case 2: When the switch supports SERDES interface, you need to choose pure 1000Mbps sfp-t module. 
Case 3: When the switch supports SGMII interface and SERDES interface, you can choose either 10/100/1000 multi rate or pure 1000Mbps sfp-t module.

2. Which one to choose also depends on what data rate the switch can support. 
Case 1: When the switch supports 10M/100M, you can only choose 10/100/1000 multi rate sfp-t module. 
Case 2: When the switch data rate supports 1000M, you can choose either 10/100/1000 multi rate or pure 1000Mbps sfp-t module. 
Case 3: Some special switches can support data rate 10G or 40G, but can backwards compatible with 1000M data rate, you need to reset data rate to 1000M, otherwise it might not work because of dismatch.

• This is 10/100/1000M Multi-Rate SFP-T, compatible for GLC-T(10/100/1000)/ SFP-GE-T(10/100/1000) (Coding as SFP-GE-T)
• 1000BASE-T SFP transceiver module for Category 5e copper wire, RJ-45 connector
• 10/100/1000 SFP RJ45/ SFP Copper/ SFP-T/ 1000Base-T
• 100% Compatible with Cisco.10Gtek owns Compatibility LAB to meet the coding requirements for various brands of switches and routers. Each transceiver is individually tested on Cisco switches and we will make sure 100% compatible before delivery
• This is a real 10/100/1000 Auto-negotiation SFP-T module, just same as how it is advertised. Since some other sellers announce it is 10/100/1000, but it turns out not work properly on 10M or 100M. 10Gtek can offer Money-back guarantee if it does't work

This is 10/100/1000M Multi-Rate SFP-T, compatible for GLC-T(10/100/1000)/ SFP-GE-T(10/100/1000) (Coding as SFP-GE-T)10Gtek