Interface between GPRS Support Nodes (GSNs) within a PLMN Gn interface

(+)HPI interface

(+)USB-GPIB General Purpose Interface

1 -Wire interface

12-LEAD ECG interface

155 M interface

16 E1 Interface Board GE16

1DL Interface Definition Language

1-Wire interface

2 M interface

232 interface

232 Serial interface

3D interface

3-d planar crack terminating at the interface

3D user interface

3-line serial interface

3-wire interface

4 wire EM interface

485 Interface