Packet Transfer Mode ({{bibref|G.993.1|Annex H}}). This object contains the {{object|Link}} interface. {{numentries}} PTM link-layer table (a stackable interface object as described in {{bibref|TR-181i2|Section 4.2}}). Models a layer 2 variable-sized packet interface. A PTM Link entry is typically stacked on top of either a {{object|.FAST.Line.}}, {{object|.DSL.Channel.}}, or a {{object|.DSL.BondingGroup.}} object. When a ''PTM Link'' interface is used, a lower-layer {{object|.DSL.Channel}} interface MUST be configured with PTM encapsulation (see {{param|.DSL.Channel.{i}.LinkEncapsulationUsed}}). Enables or disables the link. This parameter is based on ''ifAdminStatus'' from {{bibref|RFC2863}}. The current operational state of the link (see {{bibref|TR-181i2|Section 4.2.2}}). {{enum}} When {{param|Enable}} is {{false}} then {{param}} SHOULD normally be {{enum|Down}} (or {{enum|NotPresent}} or {{enum|Error}} if there is a fault condition on the interface). When {{param|Enable}} is changed to {{true}} then {{param}} SHOULD change to {{enum|Up}} if and only if the interface is able to transmit and receive network traffic; it SHOULD change to {{enum|Dormant}} if and only if the interface is operable but is waiting for external actions before it can transmit and receive network traffic (and subsequently change to {{enum|Up}} if still operable when the expected actions have completed); it SHOULD change to {{enum|LowerLayerDown}} if and only if the interface is prevented from entering the {{enum|Up}} state because one or more of the interfaces beneath it is down; it SHOULD remain in the {{enum|Error}} state if there is an error or other fault condition detected on the interface; it SHOULD remain in the {{enum|NotPresent}} state if the interface has missing (typically hardware) components; it SHOULD change to {{enum|Unknown}} if the state of the interface can not be determined for some reason. This parameter is based on ''ifOperStatus'' from {{bibref|RFC2863}}. {{datatype|expand}} The textual name of the link as assigned by the CPE. The accumulated time in {{units}} since the link entered its current operational state. {{list}} {{reference|an interface object that is stacked immediately below this interface object}} See {{bibref|TR-181i2|Section 4.2.1}}. The MAC Address of the interface. Note: This is not necessarily the same as the Ethernet header source or destination MAC address, which is associated with the IP interface and is modeled via the {{param|.Ethernet.Link.{i}.MACAddress}} parameter. Throughput statistics for this interface. The CPE MUST reset the interface's Stats parameters (unless otherwise stated in individual object or parameter descriptions) either when the interface becomes operationally down due to a previous administrative down (i.e. the interface's {{param|#.Status}} parameter transitions to a down state after the interface is disabled) or when the interface becomes administratively up (i.e. the interface's {{param|#.Enable}} parameter transitions from {{false}} to {{true}}). Administrative and operational interface status is discussed in {{bibref|TR-181i2|section 4.2.2}}. The total number of bytes transmitted out of the interface, including framing characters. The total number of bytes received on the interface, including framing characters. The total number of packets transmitted out of the interface. The total number of packets received on the interface. The total number of outbound packets that could not be transmitted because of errors. The total number of inbound packets that contained errors preventing them from being delivered to a higher-layer protocol. The total number of packets requested for transmission which were not addressed to a multicast or broadcast address at this layer, including those that were discarded or not sent. The total number of received packets, delivered by this layer to a higher layer, which were not addressed to a multicast or broadcast address at this layer. The total number of outbound packets which were chosen to be discarded even though no errors had been detected to prevent their being transmitted. One possible reason for discarding such a packet could be to free up buffer space. The total number of inbound packets which were chosen to be discarded even though no errors had been detected to prevent their being delivered. One possible reason for discarding such a packet could be to free up buffer space. The total number of packets that higher-level protocols requested for transmission and which were addressed to a multicast address at this layer, including those that were discarded or not sent. The total number of received packets, delivered by this layer to a higher layer, which were addressed to a multicast address at this layer. The total number of packets that higher-level protocols requested for transmission and which were addressed to a broadcast address at this layer, including those that were discarded or not sent. The total number of received packets, delivered by this layer to a higher layer, which were addressed to a broadcast address at this layer. The total number of packets received via the interface which were discarded because of an unknown or unsupported protocol.