Alcatel USA Sourcing, L.p.

Jim Lotz

Hamid R Baradaran

Prakash Appanna

Hans Christian Mogensen

Tony Huang

Jensheng Lee

Tom Koai

Asymmetrical digital subscriber line (ADSL) upstream subscriber bus interface (SBI) protocol provides a SBI frame format which allows compatibility between an ADSL line card and either an ADSL bank control unit (ABCU) or a conventional narrowband bank control unit (BCU), and compatibility between a conventional plain old telephone service (POTS) line card and either the ABCU or the conventional narrowband BCU.

Asymmetrical digital subscriber line (ADSL) upstream subscriber bus interface (SBI) protocol

A subscriber bus interface (SBI) frame format provides discrimination between asymmetrical digital subscriber line (ADSL) signal traffic and non-ADSL traffic. In the frame format, ASDL identification tag (AIT) bits are assigned to a higher order byte of an SBI time slot of an SBI frame for identifying whether or not a line card transmitting the SBI frame is an ADSL line card. Further, an overhead byte is assigned to a lower order byte of the SBI time slot. The overhead byte includes cell type indicator bits for indicating if the SBI frame contains asynchronous transfer mode (ATM) payload bytes found in ADSL signal traffic. The AIT bits of the higher order byte include an alternating pattern of binary &ldquo;0&rdquo;s and &ldquo;1&rdquo;s to prevent accidental generation of the AIT bits by a non-ADSL line card. The AIT byte and overhead byte are stored in the first time slot of the SBI frame so that the AIT byte will be received first by a control unit to allow the control unit to quickly identify if the frame is being transmitted from an ADSL line card.

Asymmetrical digital subscriber line (ADSL) signal traffic and non-ADSL traffic discriminator

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Jim Lotz