newbie to digital tv (Newcastle Area)

[Mr]

we have a panasonic TU-CT20A
just did a search and we have the following channels

2 - ABC TV NSW
3 - SBS Digital 1
5 - SC10 Newcastle
6 - Prime Newcastle
8 - NBN Digital
20 - ABC HDTV
21 - ABC 2
22 - ABC 3
23 - ABC 4
30 - SBS HD
31 - SBS EPG
33 - SBS Digital
38 - SBS Radio 1
39 - SBS Radio 2
61 -Prime View 1
62 - Prime View 2
80 - NBN HD
200 - ABC Dig Radio


is this all the channels available in my area
why are so many channels repeated ? , sbs is the only channel with the epg
, i thought they all had it

thanks stephen