+ * GateSpec describes specific authorization parameters defining a Gate (i.e., QoS limits, timers, etc.).
+ *
+ * From the Packetcable Multimedia specification section 6.1.4
+ *
+ * The GateSpec describes some high-level attributes of the Gate, and contains information regarding the treatment of
+ * other objects specified in the Gate message. Information contained in a GateSpec is outlined below.
+ *
+ * * SessionClassID
+ * * Direction
+ * * Authorized Timer
+ * * Reserved Timer
+ * * Committed Timer
+ * * Committed Recovery Timer
+ * * DSCP/TOS Overwrite
+ * * DSCP/TOS Mask
+ *
+ * SessionClassID provides a way for the Application Manager and the Policy Server to group Gates into different
+ * classes with different authorization characteristics. For example, one could use the SessionClassID to represent
+ * some prioritization or preemption scheme that would allow either the Policy Server or the CMTS to preempt a preauthorized
+ * Gate in favor of allowing a new Gate with a higher priority to be authorized.
+ *
+ * Direction indicates whether the Gate is for an upstream or downstream flow. Depending on this direction, the CMTS
+ * MUST reserve and activate the DOCSIS flows accordingly. For Multicast Gates the CMTS needs to only support
+ * flows or gates in the downstream direction.
+ *
+ * Authorized Timer limits the amount of time the authorization must remain valid before it is reserved (see
+ * Section 6.2).
+ *
+ * Reserved Timer limits the amount of time the reservation must remain valid before the resources are committed (see
+ * Section 6.2).
+ *
+ * Committed Timer limits the amount of time a committed service flow may remain idle.
+ *
+ * Committed Recovery Timer limits the amount of time that a committed service flow can remain without a
+ * subsequent refresh message from the PS/AM once the PS/AM has been notified of inactivity (see Section 6.2).
+ * DSCP/TOS Overwrite field can be used to overwrite the DSCP/TOS field of packets associated with the DOCSIS
+ * Service Flow that corresponds to the Gate. This field may be unspecified in which case the DSCP/TOS field in the
+ * packet is not over-written by the CMTS. This field may be used in both the upstream and downstream directions.
+ * The CMTS MUST support DSCP/TOS overwrite for upstream gates. The CMTS MAY support DSCP/TOS
+ * overwrite for downstream gates. If DSCP/TOS is enabled in a downstream gate and the CMTS does not support that
+ * function, then the field is ignored. The manner in which the CMTS interprets the DSCP/TOS Overwrite & Mask
+ * fields and transforms it into the corresponding DOCSIS Service Flow Parameters is defined in Section 6.4.2.5.