This AtmServiceCategory object selects the ATM service category for this connection, with the description noting that the 'other' category can't actually be written and any attempt defaults to ubr(6). An admin chooses this to match the QoS behavior the circuit needs, such as constant bit rate for voice or unspecified bit rate for best-effort data. For example, an admin provisioning a circuit for bursty data traffic without strict guarantees would set csAtmConnType to ubr(6), while a voice circuit needing guaranteed bandwidth would use a CBR setting.