ds2155gt-r Maxim Integrated Products, Inc., ds2155gt-r Datasheet - Page 59

• Manufacturer Part Number: ds2155gt-r
• Description: Ds2155 T1/e1/j1 Single-chip Transceiver
• Manufacturer: Maxim Integrated Products, Inc.

DS2155
10.2 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 DS2155 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.
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