The CN8223 ATM Transmitter/Receiver with UTOPIA Level 1 interface provides a single-access ATM service termination for User-to-Network (UNI) and Network-to-Network Interfacing (NNI) in conformance with ATM Forum UNI and NNI Specification 94/0317; Bellcore Specifications TR-TSV-000772, TR-TSV-000773, TR-NWT-000253, and T1S1/92-185; ITU Recommendations I.432, G.707, G.751, G.832, and Q.921; and ETSI prETS 300 213 and 300 214. Both Customer Premise Equipment (CPE) and switching system interface functions are provided.

Distinguishing Features
• Integrates 7 line framers with ATM
   layer processing according to ATM
   Forum UNI and NNI Specifications
• UTOPIA Level 1 interface
• Internal framers for DS3, E3 (G.751,
   G.832), E4 (G.832), STS-1, STS-3c,
   STM-1
• PLCP and G.804 HEC cell alignment
   for all data rates from 1.544 Mbps to
   155 Mbps
• Direct interface to TAXITM or external
   T1/E1 framers
• ATM and SMDS cell modes
• 4 FIFO ports with header screening,
   formatting, and transmit priority
   controls
• Idle cells generated and screened
• Statistics counts latched on
   one-second intervals
• Error detection and insertion
• Option insertion or generation of all
   line and cell overhead
• Serial or parallel line interface
• Available evaluation module
   reference design and software
• Supports Automatic Protection
   Switching (APS)

Applications
• WAN equipment
• ATM switches
• Test equipment
• ATM routers and hub