XRT59L921
Twenty-One Channel E1 Line Interface Unit
Ideal for Cost-Sensitive Transport Applications Including
Multi-service Provisioning Platforms and Routers
technology. The device contains twenty-one independent E1
channels. It is primarily targeted towards the SDH multiplexers that
accommodate TU12 Tributary Unit Frames. Line cards in these
units multiplex 21 E1 channels into higher SDH rates. Devices with
21 E1 interfaces such as the XRT59L921 provide the most efficient
method of implementing 63-channel line cards. Each channel
performs the driver and receiver functions necessary to convert
bipolar signals to logical levels and vice versa.
The receiver input accepts transformer coupled 1:1 signals, while
the transmitter is coupled to the line using a 1:2 transformer. The
same transformer configuration can be used for both balanced and
unbalanced interfaces. The device offers Loss of Signal (LOS)
detection, that provides an LOS output indication signal with
thresholds and delay that comply with the ITU G.775 requirements.
T
he XRT59L921 is an optimized twenty-one channel, E1, line
interface unit, fabricated using low power CMOS
Major Features
• Twenty-One (21) Independent
E1 (CEPT) Line Interface Units
(Transmitter, Receiver, and
Recovery)
• Transmit Output Pulses that are
Compliant with the ITU-T G.703
Pulse Template Requirement for
2.048Mbps (E1) Rates
• On-Chip Pulse Shaping for both
75. and 120. line drivers
• Detects and Clears LOS (Loss of
Signal) Per ITU-T G.775
• Operates over the Industrial
Temperature Range
• Ultra Low power consumption
• 3.3V operation with 5V
Tolerant Input
XRT59L921
Twenty-One Channel E1 Line Interface Unit
XRT59L921 Block Diagram
Features
• Transmitter has the Ability to Function
in a Clockless Mode (AFE)
• Each Transmitter can Independently
be Turned Off
• RLOS Mute per Channel to Prevent
Data Chattering
Applications
• PDH Multiplexers
• SDH Multiplexers
• Digital Cross-Connect Systems
• DECT (Digital European Cordless Telephone)
Base Stations
• CSU/DSU Equipment
Ordering Information
Product No.
XRT59L921IB
Package
316 Shrink Thin
Ball Grid Array
(21.0 mm x 21.0 mm, STBGA)
Operating
Temp. Range
-40°C to +85°C
FLY1206_XRT59L921
©2006 Exar Corporation
Exar Corporation • 48720 Kato Road • Fremont, CA 94538 • 510.668.7000 • fax 510.668.7001 •
www.exar.com
Analogue and Mixed Signal
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