Guralp Systems CMG-6TD - Manual (Page 10)

CMG-6TD Introduction
At this location, which can be up to 500 metres away, a low-power CMG-EAM
data module might act as an access point for the array elements and forward
data onto a higher-bandwidth radio link.
In semi-permanent arrays, a wireless-enabled EAM or laptop PC can be set up
as a temporary access point for the duration of a site visit.
MAN-T60-0002 10 Issue F - February 2014