CX28394/28395/28398
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
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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
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•
Functional Block Diagram
•
Receive
Dual Rail or
NRZ
RX
Slip
Buffer
Receive
System
Bus
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•
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•
ZCS*
Decode
T1/E1
Receive
Framer
Receive
Dual Rail or
NRZ
ZCS*
Encode
Overhead
Insertion
TX
Slip
Buffer
T1/E1
Transmit
Framer
Transmit
System
Bus
Applications
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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
Data Link Controllers
DL1+DL2
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.
.
Framer #1
External Data Link
DL3*
Framer #N
Control/Status
Registers
Framer #N
8394-8-5_019
JTAG
Test Port
* CX28394 and CX28398 only.
Motorola/Intel
Processor Bus
CX28394 - 4 Frames
CX28398 - 8 Frames
CX28395 - 16 Frames
Data Sheet
100054E
June 2000
CONEXANT [ CONEXANT SYSTEMS, INC ]
