Motorola MTM800 - 13.2 PEI Link Layer

2-44 Services and Feature Description
6866537D87-F Chapter 2 - MTM800 Product Information Manual September 2008
13.2 PEI Link Layer
The terminal supports AT commands and PPP [Ref 19] as a link layer between the TE2 and MT2.
PPP negotiation will use unnumbered mode only.
The AT phase is compatible with the MS-Windows standard modem type.