2002, 2003
Mindspeed TechnologiesTM, a Conexant business
All Rights Reserved.
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Mindspeed as a service to its customers and may be used for informational purposes only. Mindspeed assumes no responsibility for errors or
omissions in these materials. Mindspeed may make changes to specifications and product descriptions at any time, without notice. Mindspeed
makes no commitment to update the information and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future
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THESE MATERIALS ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, RELATING TO SALE
AND/OR USE OF MINDSPEED PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR
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28333-DSH-003-A
Mindspeed Technologies
TM
Revision History
Revision
Level
Date
Description
A
--
June 2001
Initial release
A
--
February 2003
- Updated LBO to 450 feet.
- Incorporated Errata # 500377A.
- Added loopback diagrams.
- Removed EVM, IBIS, and JAT Appendices.
- Fixed description of transmit AIS during
loopback operations.
- Renumbered document [28333-DSH-003-A].
- Updated PCB design considerations.
- Added power sequencing information.
- General corrections.
28333-DSH-003-A
Mindspeed Technologies
TM
iii
M28331/M28332/M28333 (3x)
Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit
The M28333 is a three-channel, DS3/E3/STS-1, fully integrated Line Interface Unit
(LIU) device. It is configured via external pins and does not require a microprocessor
interface. Each channel has an independent receive equalizer requiring no user
configuration. Additionally, each channel has a programmable transmit pulse shaper
that can be set to ensure that the transmit pulse meets the pulse mask requirement
for the digital cross-connect. The M28332 is a dual-channel, and the M28331 is a
single-channel LIU with performance identical to the M28333.
The M28333 gives the user new economies of scale in concentrator applications
where three DS3 or STS-1 channels are concentrated into a single STS-3 channel.
Each line interface is reduced to 1:1 coupling transformers, terminating resistors, and
a capacitor. The Transmit Line Driver Monitor checks for a faulty transmitter or
shorted output.
NOTE:
In this document, "i" is used to represent the number of channels:
i = 1 (M28331), i = 2 (M28332), and i = 3 (M28333).
Functional Block Diagram
TPOS
TNEG
TCLK
ENCODER
TAIS
Pulse
Shaper
E3MODE
LINE
DRIVER
PDB
DATA
MUX
RLOOP
ENDECDIS
LLOOP
LBO
XOE
TLINEP
TLINEM/N
DECODER
RPOS
RNEG
RCLK
RLOS
TCLK
Clock/
Data
Recovery
PDATA
PDATA/
NDATA
NDATA
DATCLK
P
N Receiver
TX
Monitor
ALOS
RLINEP
RLINEM/N
TMONP
TMONM
TXMON
TMONTST
REFCLK
REQH
Channel 1
Channel 2
Channel 3
RLOSMDIS
RLOSTHR
RLOSMAX
Distinguishing Features
Programmable pulse shaper to meet
cross-connect pulse masks (ANSI T1.102-
1993)
Meets jitter tolerance and jitter generation
specifications of Bellcore GR499, GR253,
and ETSI TBR24
Alarms for coding violation and loss of
signal
Full diagnostic loopback capability
Uses a minimum of external components
Compliant with ITU-T G.703 and ETSI
TBR24
Independent power down mode per
channel
Easily interfaced to the DS3/E3 Framer IC
(CX28342/3/4/6/8 and CN8330)
Selectable B3ZS/HDB3 encoding/
decoding
Transmit monitor inputs
Programmable RLOS threshold
Physical Characteristics
100-pin ETQFP package
Single 3.3 V power supply
1 W maximum power dissipation
(M28333)
- 40 C to +85 C temperature range
5 V-tolerant pins
TTL digital pins
Applications
Digital Cross-Connect Systems
Routers
ATM Switches
Channelized Line Aggregation Units
Test Equipment
Channel Service Units
Multiplexers
28333-DSH-003-A
Mindspeed Technologies
TM
v
Table of Contents
Table of Contents
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
List of Figures
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
List of Tables
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
1.0
Pin Description
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.1
Pin Assignments
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
2.0
Functional Description
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.1
Overview
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.2
Transmitter
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.2.1
AMI B3ZS/HDB3 Encoder
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.2.2
Pulse Shaper
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.2.3
Line Driver
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2.2.3.1
Transmit Pulse Mask Templates
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2.2.4
Alarm Indication Signal (AIS) Generator
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
2.2.5
Transmit Monitor Block
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
2.2.6
Jitter Generation (Intrinsic)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
2.3
Receiver
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
2.3.1
Receive Sensitivity
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
2.3.2
AGC/VGA Block
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
2.3.3
Receive Equalizer
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
2.3.4
The PLL Clock Recovery Circuit
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
2.3.5
Receive Loss Of Signal (RLOS) Detector
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
2.3.6
B3ZS/HDB3 Decoder With Bipolar Violation Detector
. . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
2.3.7
Data Squelching
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
2.4
Jitter Tolerance
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
2.4.1
Jitter Transfer
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
2.5
Additional M2833i Functions
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
2.5.1
Bias Generator
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
2.5.2
Power-On Reset (POR)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
2.5.3
Loopback Multiplexers (MUXes)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
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