> For the complete documentation index, see [llms.txt](https://gsm-hacking.telco-sec.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://gsm-hacking.telco-sec.com/2g-in-a-b0x/bts.md).
# BTS
Here we need to configure 2 parts
```
sudo vi /etc/osmocom/osmo-bts.cfg
```
```
phy 0
instance 0
osmotrx rx-gain 30 ! Set the receiver gain (configured in the hardware) in dB.
osmotrx tx-attenuation 30 ! Set the transmitter attenuation (configured in the hardware) in dB.
osmotrx ip local 127.0.0.1
osmotrx ip remote 127.0.0.1
no osmotrx timing-advance-loop
```
```
bts 0
oml remote-ip 127.0.0.1
ipa unit-id 6969 0
gsmtap-sapi pdtch
gsmtap-sapi ccch
band 900
trx 0
phy 0 instance 0
```
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