DS2155
T1/E1/J1 Single-Chip Transceiver
www.maxim-ic.com
GENERAL DESCRIPTION
FEATURES
The DS2155 is a software-selectable T1, E1, or J1
single-chip transceiver (SCT) for short-haul and
long-haul applications. The DS2155 is composed of a
line interface unit (LIU), framer, HDLC controllers,
and a TDM backplane interface, and is controlled by
an 8-bit parallel port configured for Intel or Motorola
bus operations. The DS2155 is pin and software
compatible with the DS2156.
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Complete T1/DS1/ISDN-PRI/J1 Transceiver
Functionality
Complete E1 (CEPT) PCM-30/ISDN-PRI
Transceiver Functionality
Long-Haul and Short-Haul Line Interface for
Clock/Data Recovery and Waveshaping
CMI Coder/Decoder for Optical I/F
Crystal-Less Jitter Attenuator
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Fully Independent Transmit and Receive
Functionality
The LIU is composed of transmit and receive
interfaces and a jitter attenuator. The transmit
interface is responsible for generating the necessary
waveshapes for driving the network and providing
the correct source impedance depending on the type
of media used. T1 waveform generation includes
DSX-1 line buildouts as well as CSU line buildouts
of -7.5dB, -15dB, and -22.5dB. E1 waveform
generation includes G.703 waveshapes for both 75Ω
coax and 120Ω twisted cables. The receive interface
provides network termination and recovers clock and
data from the network.
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Dual HDLC Controllers
Programmable BERT Generator and Detector
Internal Software-Selectable Receive and
Transmit-Side Termination Resistors for
75ꢀ/100ꢀ/120ꢀ T1 and E1 Interfaces
Dual Two-Frame Elastic-Store Slip Buffers that
Connect to Asynchronous Backplanes Up to
16.384MHz
16.384MHz, 8.192MHz, 4.096MHz, or
2.048MHz Clock Output Synthesized to
Recovered Network Clock
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Features continued in Section 3.
APPLICATIONS
T1/E1/J1 Line Cards
Switches and Routers
Add-Drop Multiplexers
ORDERING INFORMATION
PART
TEMP RANGE PIN-PACKAGE
DS2155L
0°C to +70°C
0°C to +70°C
-40°C to +85°C 100 LQFP
-40°C to +85°C 100 LQFP
0°C to +70°C
0°C to +70°C
-40°C to +85°C 100 CSBGA
-40°C to +85°C 100 CSBGA
100 LQFP
100 LQFP
DS2155L+
DS2155LN
DS2155LN+
DS2155G
DS2155G+
DS2155GN
DS2155GN
DS2155
T1/E1/J1
SCT
T1/E1/J1
NETWORK
BACKPLANE
100 CSBGA
100 CSBGA
TDM
+ Denotes a lead-free/RoHS-compliant package.
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
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REV: 080607