Man pages matching name device::modem::protocol::xmodem in section 3pm:

Device::Modem::Protocol::Xmodem.3pm.en	debian 10 / libdevice-modem-perl
Device::Modem::Protocol::Xmodem.3pm.en	debian 11 / libdevice-modem-perl
Device::Modem::Protocol::Xmodem.3pm.en	debian 12 / libdevice-modem-perl