Rainbow Electronics DS2154 - Manual (Page 2)

DS2154
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onboard jitter attenuator (selectable to either 32 bits or
128 bits) can be placed in either the transmit or receive
data paths. The framer locates the frame and multi-
frame boundaries and monitors the data stream for
alarms. It is also used for extracting and inserting
signaling data, Si, and Sa bit information. The device
contains a set of internal registers which the user can
access and control the operation of the unit. Quick
access via the parallel control port allows a single con-
troller to handle many E1 lines. The device fully meets
all of the latest E1 specifications including ITU G.703, G.704, G.706, G.823, G.932, and I.431 as well as ETS
300 011, 300 233, and 300 166.
1.0 INTRODUCTION
The DS2154 is a super–set version of the popular
DS2153 E1 Single–Chip Transceiver offering the new
features listed below. All of the original features of the
DS2153 have been retained and software created for
the original devices is transferrable into the DS2154.
NEW FEATURE SECTION
Option for non–multiplexed bus operation 1 and 2
Crystal–less jitter attenuation 12
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
7
Improved receive sensitivity: 0 dB to –43 dB 12
Per–channel code insertion in both transmit and receive paths 8
Expanded access to Sa and Si bits 11
RCL, RLOS, RRA, and RAIS alarms now interrupt on change of state 4
8.192 MHz clock synthesizer 1
Per–channel loopback 8
Addition of hardware pins to indicate carrier loss and signaling freeze 1
Line interface function can be completely decoupled from the framer/formatter to
allow:
Interface to optical, HDSL, and other NRZ interfaces
“tap” the transmit and receive bipolar data streams for monitoring purposes
Be able corrupt data and insert framing errors, CRC errors, etc. 1
Transmit and receive elastic stores now have independent backplane clocks 1
Ability to monitor one DS0 channel in both the transmit and receive paths 6
Access to the data streams in between the framer/formatter and the elastic stores 1
AIS generation in the line interface that is independent of loopbacks 1 and 3
Transmit current limiter to meet the 50 mA short circuit requirement 12
Option to extend carrier loss criteria to a 1 ms period as per ETS 300 233 3
Automatic RAI generation to ETS 300 011 specifications 3