Quad/x16/Octal—T1/E1/J1 Framers



The CX28394/28395/28398 is a family of multiple framers for T1/E1/J1 and Integrated Service Digital Network (ISDN) primary rate interfaces operating at 1.544 Mbps or 2.048 Mbps. All framers are totally independent, and each combines a sophisticated framing synchronizer and transmit/receive slip buffers. Operations are controlled through a series of memory-mapped registers accessible via a parallel microprocessor port. Extensive register support is provided for alarm and error monitoring, signaling supervision (including ISDN D-channel/SS7 process), per-channel trunk conditioning, and Facility Data Link (FDL) maintenance. A flexible serial Time Division Multiplexed (TDM) system interface that supports bus rates from 1.536 to 8.192 MHz is featured.

Extensive test and diagnostic functions include a full set of loopbacks, Pseudo Random Bit Sequence (PRBS) test pattern generation, Bit Error Rate (BER) meter, and forced error insertion.

Distinguishing Features

• Up to 16 T1/E1/J1 Framers in one package

• Extensive support of various protocols

• T1: SF, ESF, SLC®96, T1DM, TTC JT(J1)

• E1: PCM-30, G.704, G.706, G.732, ISDN primary rate (ETS300 011, INS 500)

• Extracts and inserts signaling bits

• Dual HDLC controllers per framer for data link and LAPD/SS7 signaling

• Two-frame transmit and receive PCM slip buffers

• Separate or multiplexed system bus interfaces

• Parallel 8-bit microprocessor port supports Intel or Motorola buses

• BERT generation and counting

• B8ZS/HDB3/Bit 7 zero suppression (CX28394 and CX28398 only)

• Operates from a single +3.3 Vdc ±5% power supply

• Low-power CMOS technology



Applications

• Multiline T1/E1 Channel Service Unit/Data Service Unit (CSU/DSU)

• Digital Access Cross-Connect System (DACS)

• T1/E1 Multiplexer (MUX)

• PBXs and PCM channel bank

• ISDN Primary Rate Access (PRA)

• Frame Relay Switches and Access Devices (FRADS)

• SONET/SDH add/drop multiplexers

• T3/E3 channelized access concentrators