DS2156L+ Maxim Integrated Products, DS2156L+ Datasheet - Page 66
DS2156L+
Manufacturer Part Number
DS2156L+
Description
IC TXRX T1/E1/J1 1-CHIP 100-LQFP
Manufacturer
Maxim Integrated Products
Datasheet
1.DS2156L.pdf
(265 pages)
Specifications of DS2156L+
Function
Single-Chip Transceiver
Interface
E1, J1, T1, TDM, UTOPIA II
Number Of Circuits
1
Voltage - Supply
3.14 V ~ 3.47 V
Current - Supply
75mA
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
100-LQFP
Includes
BERT Generator and Detector, CMI Coder and Decoder, HDLC Controller
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power (watts)
-
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DS2156
9.2
Automatic Alarm Generation
The device can be programmed to automatically transmit AIS or remote alarm. When automatic AIS
generation is enabled (E1TCR2.1 = 1), the device monitors the receive-side framer to determine if any of
the following conditions are present: loss-of-receive frame synchronization, AIS alarm (all ones)
reception, or loss-of-receive carrier (or signal). The framer forces either an AIS or remote alarm if any
one or more of these conditions is present.
When automatic RAI generation is enabled (E1TCR2.0 = 1), the framer monitors the receive side to
determine if any of the following conditions are present: loss-of-receive-frame synchronization, AIS
alarm (all ones) reception, loss-of-receive carrier (or signal), or if CRC4 multiframe synchronization
cannot be found within 128ms of FAS synchronization (if CRC4 is enabled). If any one or more of these
conditions is present, then the framer transmits an RAI alarm. RAI generation conforms to ETS 300 011
specifications and a constant remote alarm is transmitted if the DS2156 cannot find CRC4 multiframe
synchronization within 400ms as per G.706.
Note: It is an invalid state to have both automatic AIS generation and automatic remote alarm generation
enabled at the same time.
66 of 265
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