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DS2152 Datasheet(PDF) 4 Page - Dallas Semiconductor

Part # DS2152
Description  Enhanced T1 Single-Chip Transceiver
Download  94 Pages
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Manufacturer  DALLAS [Dallas Semiconductor]
Direct Link  https://www.maximintegrated.com/en.html
Logo DALLAS - Dallas Semiconductor

DS2152 Datasheet(HTML) 4 Page - Dallas Semiconductor

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DS2152
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1.0 INTRODUCTION
The DS2152 is a superset version of the popular DS2151 T1 Single-Chip Transceiver offering the new
features listed below. All of the original features of the DS2151 have been retained and software created
for the original devices is transferable into the DS2152.
New Features
§ option for non-multiplexed bus operation
§ crystal-less jitter attenuation
§ additional hardware signaling capability including:
receive signaling reinsertion to a backplane multiframe sync
availability of signaling in a separate PCM data stream
signaling freezing
interrupt generated on change of signaling data
§ per-channel code insertion in both transmit and receive paths
§ full HDLC controller for the FDL with 16-byte buffers in both transmit and receive paths
§ RCL, RLOS, RRA, and RAIS alarms now interrupt on change of state
§ 8.192 MHz clock synthesizer
§ per-channel loopback
§ addition of hardware pins to indicate carrier loss & signaling freeze
§ line interface function can be completely decoupled from the framer/formatter to allow:
interface to optical, HDSL, and other NRZ interfaces
ability to “tap” the transmit and receive bipolar data streams for monitoring purposes
ability to corrupt data and insert framing errors, CRC errors, etc.
§ transmit and receive elastic stores now have independent backplane clocks
§ ability to monitor one DS0 channel in both the transmit and receive paths
§ access to the data streams in between the framer/formatter and the elastic stores
§ AIS generation in the line interface that is independent of loopbacks
§ ability to calculate and check CRC6 according to the Japanese standard
§ ability to pass the F-bit position through the elastic stores in the 2.048 MHz backplane mode
§ programmable in-band loop code generator and detector
Functional Description
The analog AMI/B8ZS waveform off the T1 line is transformer-coupled into the RRING and RTIP pins
of the DS2152. The device recovers clock and data from the analog signal and passes it through the jitter
attenuation mux to the receive side framer where the digital serial stream is analyzed to locate the
framing/multi-frame pattern. The DS2152 contains an active filter that reconstructs the analog received
signal for the non-linear losses that occur in transmission. The device has a usable receive sensitivity of 0
dB to -36 dB, which allows the device to operate on cables up to 6000 feet in length. The receive side
framer locates D4 (SLC-96) or ESF multiframe boundaries as well as detects incoming alarms, including
carrier loss, loss of synchronization, blue (AIS) and yellow alarms. If needed, the receive side elastic store
can be enabled in order to absorb the phase and frequency differences between the recovered T1 data
stream and an asynchronous backplane clock which is provided at the RSYSCLK input. The clock
applied at the RSYSCLK input can be either a 2.048 MHz clock or a 1.544 MHz clock. The RSYSCLK
can be a bursty clock with speeds up to 8.192 MHz.
The transmit side of the DS2152 is totally independent from the receive side in both the clock
requirements and characteristics. Data off of a backplane can be passed through a transmit side elastic
store if necessary. The transmit formatter will provide the necessary frame/multiframe data overhead for
T1 transmission. Once the data stream has been prepared for transmission, it is sent via the jitter
attenuation mux to the waveshaping and line driver functions. The DS2152 will drive the T1 line from the


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