Linking Cisco Catalyst 3750G with 3Com Switch 4210 by Ensign Technology SFP Transceivers

Information from SFP modules:

1. Ensign Technology SFP Transceiver 1.25Gbps SC,3.3V,SM,20km,TX=1310nm
2. Ensign Technology SFP G-SFP-150-1SM-20SC SC,3.3V,SM,20km,TX=1550nm

Cisco Catalyst 3750G configuration:

#show inventory 
NAME: "GigabitEthernet2/0/26", DESCR: "unsupported"
PID:                     , VID: V48, SN: E61V194001251  

#show running-config
...
service unsupported-transceiver

interface GigabitEthernet2/0/26
 speed nonegotiate
 ...

3Com Switch 4210 18-Port configuration:

#display current-configuration interface gi 1/0/20
interface GigabitEthernet1/0/20
 duplex full
 speed 1000
 ...