adsb messages decoded

#1
adsbScope 2.7 has a little window where you can watch decoded messages scroll by..
Can anyone here explain to me (a novice at electronic plane watching)
what does crosslink means in this context? And maybe Short-air-sourv??

Do planes that just Squawk their ID and altitude have their transmissions repeated/relayed by other aircraft? Or, am I hearing a ground station that's repeating/relaying ID and altitude squawks?


4CAB07 Extended-squitt. Ireland 40000ft B:43.1953 L:-70.2733 Rc<185m CA:L2-air
AD1DDB Short-air-sourv. USA AC:1100ft crosslink
A63B1D All-call-reply USA CA:L2-air
AD1DDB Short-air-sourv. USA AC:1100ft crosslink
A11F59 Short-air-sourv. USA AC:31050ft crosslink
C04053 Short-air-sourv. Canada AC:36375ft
A11F59 Short-air-sourv. USA AC:31050ft crosslink
AD1DDB Short-air-sourv. USA AC:1100ft crosslink
A168F5 All-call-reply USA Inter:II-10 CA:L2-air
AD1DDB Short-air-sourv. USA AC:1100ft crosslink
A168F5 All-call-reply USA Inter:II-10 CA:L2-air
ACDA41 Short-air-sourv. USA AC:18650ft crosslink
A3EFA2 Short-air-sourv. USA AC:18925ft crosslink
A13EC0 Short-air-sourv. USA AC:3825ft no-ACAS
4B187A Extended-squitt. Switzerland V=443 HD=-137 Var=64 CA:L2-air
A8F77C Short-air-sourv. USA AC:33025ft crosslink Vmax:300..600kts
A8A110 All-call-reply USA Inter:II-10 CA:L2-air
A13EC0 Short-air-sourv. USA AC:3825ft no-ACAS
400423 Short-air-sourv. UK AC:36000ft crosslink Vmax:300..600kts
A8A110 All-call-reply USA Inter:II-10 CA:L2-air
A8A110 All-call-reply USA Inter:II-10 CA:L2-air
A79F25 Short-air-sourv. USA AC:17600ft no-ACAS
AC0538 All-call-reply USA CA:L1
A9067B Extended-squitt. USA V=476 HD=70 Var=0 CA:L2-air
A27600 All-call-reply USA Inter:II-3 CA:L2-air
A27600 Short-air-sourv. USA AC:18850ft crosslink
AD076E All-call-reply USA
A258FC All-call-reply USA CA:L2-air
3C4AD2 Sourv.-alt-reply Germany AC:35975ft
A27600 All-call-reply USA Inter:II-3 CA:L2-air
A8A110 Extended-squitt. USA 33000ft B:40.6223 L:-72.1060 Rc<185m CA:L2-air
AD076E Sourv.-alt-reply USA AC:19125ft
C04053 All-call-reply Canada CA:L2-air
AD8054 All-call-reply USA CA:L2-air
A43565 Short-air-sourv. USA AC:10775ft Vmax:300..600kts
 
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