Yu, resolved my problem with this query ---->
select cmd1.dev_attr_value as SystemName, cmd.dev_ip, cci.ci_name as Interfaz,
cast(ccia.ci_attr_value as float) * 1.0E-6 as Speed_Mbps, --This is the parameter for calculation
ccia3.ci_attr_value as Alias
from CM_CONFIGURATION_ITEM_ATTRIBUTE ccia
INNER JOIN CM_CONFIGURATION_ITEM cci on cci.ci_id = ccia.ci_id
INNER JOIN CM_DEVICE cmd on cmd.dev_id = cci.dev_id
INNER JOIN CM_DEVICE_ATTRIBUTE cmd1 on cmd1.dev_id = cci.dev_id
INNER JOIN CM_CONFIGURATION_ITEM_ATTRIBUTE ccia2 on ccia.ci_id = ccia2.ci_id
INNER JOIN CM_CONFIGURATION_ITEM_ATTRIBUTE ccia3 on ccia.ci_id = ccia3.ci_id
where ccia.ci_attr_key = 'NomSpeedInBitsPerSec'
and ccia2.ci_attr_value = 'Origin_Name'
and ccia2.ci_attr_key = 'Origin'
and ccia3.ci_attr_key = 'IfAlias'
and cmd1.dev_attr_key = 'SysName'
order by cmd1.dev_attr_key