Description: Specifies the type of V5 Link Primary The primary link carries all the important V5 Protocols. Therefore it needs to have at least one Physical Communi- cation Channel on timeslot 16. There must be exactly one primary link per V5 interface. Secondary The secondary link acts as 'standby' link for the primary link; i.e. if the primary link fails, the secondary link will transport the V5 Protocols instead. Therefore it needs to have an unused PhysComm Channel on timeslot 16. If more than one links are available, there must be exactly one secondary link per V5 interface. Normal All other links are 'normal' links and do not take any predefined responsibility concerning protection mechanisms.