NEC Network Controller uPD98502 - Manual (Page 229)

Preliminary User’s Manual S15543EJ1V0UM 229
CHAPTER 4 ATM CELL PROCESSOR
4.1 Overview
This section describes functional specifications of ATM cell processor unit.
4.1.1 Function features
Features of ATM Cell Processor with out Firmware (F/W) is as follows:
• Data Transmission Capacity
Aggregated transmission capacity is 50 Mbps, 25 Mbps for downstream and 25 Mbps for upstream.
• Supports ATM Adaptation Layers (AAL)
AAL-0 (raw cells), AAL-2 and AAL-5 are supported.
• Supports Service Classes
CBR, VBR and UBR.
• Number of VC’s
Maximum of 64 VC’s will be supported.
• Scheduling
Cell rate shaping will be performed in one-cell-time granularity on per VC basis
• Supports OAM function
• Supports switching function
ATM Cell Processor has a 32-bit micro-controller. All the above functions are realized by the Firmware assisted by
H/W circuits.