HDSL modules for telecommunications channel unit cards

A method of configuring the channel unit card comprising:

• providing a subscriber bus interface for communicating subscriber bus signals with a digital loop carrier matrix;
• connecting the subscriber line interface with wideband channels;
• and
• selectively coupling a high-bit-rate digital subscriber line (HDSL) module to at least one of the wideband channels to enable HDSL-based communications,
• wherein the channel unit card comprises at least one span circuit having a line interface unit (LIU) portion and a channel framer portion.

A telecommunications channel unit card comprising:

• a subscriber bus interface for communicating subscriber bus interface (SBI) signals with a bandwidth allocator, processor and timing unit (BPT) card;
• wideband channels including a processor capable of processing message-based applications, an application specific integrated circuit (ASIC) between the subscriber bus interface and span circuits capable of converting the subscriber bus interface signals and E1 signals, and three span circuits each including one line interface unit (LIU) portion and one E1 framer portion for interfacing between the ASIC and an external network;
• the E1 framer portion framing the E1 signals for transmission over the external network and for recovering the E1 signals from reception over the external network;
• the line interface unit capable of connecting to the external network when the channel unit card functions as an E1 card;
• and
• two high-bit-rate digital subscriber line (HDSL) modules having their clocks and signals pins connected to the corresponding clocks and signals pins of two corresponding E1 framer portions to facilitate HDSL-based communications between the telecommunications channel unit card and the external network.