CX28398 Conexant Systems, CX28398 Datasheet
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CX28398
Manufacturer Part Number
CX28398
Description
(CX28394 - CX28398) Quad/x16/Octal?T1/E1/J1 Framers
Manufacturer
Conexant Systems
Datasheet
1.CX28398.pdf
(305 pages)
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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.
Functional Block Diagram
. .
.
Data Sheet
* CX28394 and CX28398 only.
Framer #1
Dual Rail or
Dual Rail or
Framer #N
Receive
Receive
NRZ
NRZ
Decode
Encode
Test Port
ZCS*
ZCS*
JTAG
Control/Status
Processor Bus
Motorola/Intel
Overhead
Receive
Insertion
Framer
Registers
T1/E1
Data Link Controllers
External Data Link
Transmit
Framer
T1/E1
Buffer
Buffer
Slip
Slip
RX
TX
DL1+DL2
DL3*
CX28394 - 4 Frames
CX28398 - 8 Frames
CX28395 - 16 Frames
Framer #N
Receive
System
Bus
Transmit
System
Bus
Distinguishing Features
• Up to 16 T1/E1/J1 Framers in one
• Extensive support of various
• T1: SF, ESF, SLC
• E1: PCM-30, G.704, G.706, G.732,
• Extracts and inserts signaling bits
• Dual HDLC controllers per framer for
• Two-frame transmit and receive PCM
• Separate or multiplexed system bus
• Parallel 8-bit microprocessor port
• BERT generation and counting
• B8ZS/HDB3/Bit 7 zero suppression
• Operates from a single +3.3 Vdc
• Low-power CMOS technology
Applications
• Multiline T1/E1 Channel Service
• Digital Access Cross-Connect
• T1/E1 Multiplexer (MUX)
• PBXs and PCM channel bank
• ISDN Primary Rate Access (PRA)
• Frame Relay Switches and Access
• SONET/SDH add/drop multiplexers
• T3/E3 channelized access
package
protocols
TTC JT(J1)
ISDN primary rate (ETS300 011,
INS 500)
data link and LAPD/SS7 signaling
slip buffers
interfaces
supports Intel or Motorola buses
(CX28394 and CX28398 only)
Unit/Data Service Unit (CSU/DSU)
System (DACS)
Devices (FRADS)
concentrators
5% power supply
®
96, T1DM,
June 2000
100054E
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