good day everyone,
i am new to linux and i am trying out knoppix. my problem is about my modem USR 56 k pci model. i can use it in windows but i can't use it with knoppix. when i changed its location to tty3 or stty3?? it says "the modem is busy".or sometimes "modem not found" i want to know what pci modem model would you recommend? that is compatible with windows and with knoppix.
all replies are very much appreciated!!!!
thanks in advance

OPNsense pfSense 8-Core Atom C3758 2.2GHz 8GB DDR4 64GB SSD 8x NIC QAT AES VPN
$145.00
OPNsense Firewall 16-Core Atom C3958 16GB DDR4 RAM 64GB SSD 8x 1Gbe QAT AES-NI
$195.00
Zero Trace Pen: All-in-one Tor Network Anonymous Drive + Cryptocurrency Wallet
$147.00
Check Point 1590 Firewall & w builtin WiFI and builtin LTE sim slot
$95.99
OPNsense pfSense 16-Core Atom C3958 16GB ECC RAM 512GB SSD 8-Port QAT AES-NI VPN
$258.00
Fortinet FortiGate 60F FG-60F UTM UTP License Until 2027 Network Security FW VPN
$229.99
Fortinet FortiGate 60F FG-60F Firewall Tested Reset Deregistered OEM PSU
$99.99
Netgate SG-2100 pfSense Plus 26.07 Firewall VPN Router - Wiped, Fresh Install
$174.99
Alta Labs Route10 10Gbps Router Firewall 2x SFP+ 4x 2.5GbE 2x PoE+
$174.99
SonicWall TZ280 Firewall 03-SSC-6933 Advanced Edition 3YR NEW SEALED
$999.99