wfDs1E1PortMapDslId 1.3.6.1.4.1.18.3.4.9.2.1.5

When this T1/E1 interface is configured for Primary Rate ISDN (PRI) this attribute provides the ID of this Digital Subscriber Loop (DSL) interface. Each T1 or E1 PRI interface on a particular slot is assigned a unique DSL ID.