m28333-3x Mindspeed Technologies, m28333-3x Datasheet - Page 3

• Manufacturer Part Number: m28333-3x
• Description: Single/dual/triple E3/ds3/sts-1 Line Interface Unit
• Manufacturer: Mindspeed Technologies

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:
Functional Block Diagram
28333-DSH-003-A
E3MODE
RLOOP
LLOOP
RNEG
RPOS
TNEG
TPOS
RCLK
RLOS
TCLK
TAIS
XOE
PDB
LBO
In this document, “i” is used to represent the number of channels:
i = 1 (M28331), i = 2 (M28332), and i = 3 (M28333).
DATA
MUX
DECODER
ENCODER
PDATA/
NDATA
TCLK
DATCLK
PDATA
NDATA
RLOSMAX
RLOSTHR
Shaper
Recovery
RLOSMDIS
Pulse
Clock/
Data
Mindspeed Technologies
ALOS
P
N Receiver
DRIVER
LINE
Monitor
TX
Channel 1
TLINEP
TLINEM/N
TMONP
TMONM
TXMON
TMONTST
REFCLK
RLINEP
RLINEM/N
REQH
Channel 2
Channel 3
™
Distinguishing Features
• Programmable pulse shaper to meet
• Meets jitter tolerance and jitter generation
• Alarms for coding violation and loss of
• Full diagnostic loopback capability
• Uses a minimum of external components
• Compliant with ITU-T G.703 and ETSI
• Independent power down mode per
• Easily interfaced to the DS3/E3 Framer IC
• Selectable B3ZS/HDB3 encoding/
• Transmit monitor inputs
• Programmable RLOS threshold
Physical Characteristics
• 100-pin ETQFP package
• Single 3.3 V power supply
• 1 W maximum power dissipation
• - 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
cross-connect pulse masks (ANSI T1.102-
1993)
specifications of Bellcore GR499, GR253,
and ETSI TBR24
signal
TBR24
channel
(CX28342/3/4/6/8 and CN8330)
decoding
(M28333)
iii