The power jack is a standard DC barrel, 4.0mm OD 1.7mm ID.
The ext connector is detailed here (including model data!):
CODE
http://catalog.tycoelectronics.com/catalog/bin/TE.Connect?S=24100&M=PPROP&P=&BML=10000-M&LG=1&PG=1&IDS=321950,321232,372004,372007,382493,321233,442539,437007&N=7