This read-write octet string holds the SMDS address associated with this trunk-side port, either the local address shared by all optimum paths for an SSI feeder port, or the specific remote address for an SSI optimum-path port, encoded per the SMDS address format with leading fixed nibbles, 10 BCD-encoded digits, and padded trailing bits. An admin configures this to match the carrier-assigned SMDS address for the circuit, since a mismatch would prevent the SMDS switch from correctly routing cells associated with this trunk path. For example, an admin provisioning a new SSI optimum path would populate lportSmdsTrkAddr with the correctly BCD-encoded 10-digit SMDS address assigned to the remote end of that specific path.