The CM-TBG is a dual GSM telephone expansion card. It extends the talkback capability of the CM-TB8 by allowing mobile telephone calls to be made and received via two independent quad band mobile telephone modules.

Technical Specification For CM-TBG
Module Type:Quad-Band EGSM 850 / 900 / 1800 /1900MHz
Output Power:Class 4 (2W) @ 850 / 900MHz
Class 1 (1W) @ 1800 / 1900MHz
Sensitivity:-107 dBm (typ.) @ 850 / 900MHz
-106 dBm (typ.) @ 1800 / 1900MHz
Approvals:Fully type approved conforming to R&TTE CE, GCF, FCC, PTCRB, IC, Anatel
Connections:2 x SMA Socket antenna
CM-TBG:Add-in card for CM-TB8 with 2 x GSM line.
CM-TB8G :CM-TB8 including CM-TBG.