T1 Line Monitor Chip

The DS2182A T1 line monitor chip is a monolithic CMOS device designed to monitor real-time performance on T1 lines. The DS2182A frames to the data on the line, counts errors, and supplies detailed information about the status and condition of the line. Large on-board counters allow the accumulation of errors for extended periods, which permits a single CPU to monitor many T1 lines. Output clocks that are synchronized to the incoming data stream are provided for easy extraction of S-bits, FDL bits, signaling bits, and channel data. The DS2182A meets the requirements of ANSI T1.231.

* Performs Framing and Monitoring Functions

* Supports Superframe and Extended Superframe Formats

* Four On-Board Error Counters:

* 16-Bit Bipolar Violation

* 8-Bit CRC

* 8-Bit OOF

* 8-Bit Frame Bit Error

* Indication of the Following:

* Yellow and Blue Alarms

* Incoming B8ZS Codewords

* 8 and 16 Zero Strings

* Change-of-Frame Alignment

* Loss of Sync

* Carrier Loss

* Simple Serial Interface Used for Configuration, Control, and Status Monitoring

* Burst Mode Allows Quick Access to Counters for Status Updates

* Automatic Counter Reset Feature

* Single 5V Supply; Low-Power CMOS Technology

* Available in 28-Pin DIP and 28-Pin PLCC

* Upward-Compatible from the Original DS2182

* The DS2182A includes the following changes from the original DS2182:

* Ability to Count Excessive Zeros

* Severely Errored-Framing-Event Indication

* Updated AIS Detection

* Updated RCL Detection

* AIS and RCL Alarm Clear Indications