DS33Z44

Specialized Overview

The DS33Z44 is a quad Ethernet mapper that extends four 10/100 Ethernet LAN segments by encapsulating MAC frames in HDLC or X.86 (LAPS) for transmission over four PDH/TDM data streams. It supports bidirectional synchronous interconnect up to 52Mbps across xDSL, T1/E1/J1, T3/E3, V.35/Optical, OC-1/EC-1, and SONET/SDH Tributary links. The device performs store-and-forward packet processing with full wire-speed transport capability. It features built-in Committed Information Rate controllers providing fractional bandwidth allocation up to the line rate in increments of 512kbps. The component operates at 1.8V with 3.3V tolerant I/O and is housed in a 256-pin CSBGA package.

Specialized Feature Summary

• Four 10/100 IEEE 802.3 Ethernet MACs supporting MII and RMII interfaces with half/full-duplex operation and automatic flow control
• Four 52Mbps synchronous TDM serial ports featuring independent transmit and receive timing capabilities
• HDLC/LAPS encapsulation support with programmable FCS and interframe fill parameters
• Committed Information Rate controllers enabling fractional bandwidth allocations in 512kbps increments

Specialized Applications

• Transparent LAN Service
• LAN Extension
• Ethernet Delivery Over T1/E1/J1, T3/E3, OC-1/EC-1, G.SHDSL, or HDSL2/4

Specialized Procurement Notes

Verify the specific revision status before procurement, as multiple revisions may be available through various sales channels. Consult official errata documentation for any deviations from published specifications associated with the manufacturing lot. Confirm the exact pin-package configuration matches the design requirements prior to ordering.

Specialized Selection Notes

Select this component when extending multiple Ethernet segments over PDH/TDM infrastructure is required. Ensure the system design accommodates an external 16MB, 100MHz SDRAM buffer for packet storage. Verify compatibility with the intended host processor interface or confirm if standalone hardware mode operation meets the application needs.

Specialized Part Context

This device belongs to the DS33Z series of telecom interface ICs designed for Ethernet-to-PDH mapping. It serves as a bridge between local area networks and wide area network transport layers. The component integrates MAC functions with serial interface logic to facilitate transparent data transport over legacy telecommunications circuits.

Specialized Replacement Considerations

Consult the manufacturer's product change notification documents for officially confirmed substitute part numbers. Do not assume functional equivalence with other models in the family without verifying register compatibility and electrical specifications against current datasheets.