CS61535A Cirrus Logic, Inc., CS61535A Datasheet - Page 27

• Manufacturer Part Number: CS61535A
• Description: T1-E1 Line Interface Unit for PCM applications
• Manufacturer: Cirrus Logic, Inc.

Status
AIS - Alarm Indication Signal, Pin 11. (Extended Hardware Mode)
BPV- Bipolar Violation Strobe, Pin 6. (Extended Hardware Mode)
DPM - Driver Performance Monitor, Pin 11. (Hardware and Host Modes)
LOS - Loss of Signal, Pin 12.
MTIP, MRING - Monitor Tip, Monitor Ring, Pins 17 and 18. (Hardware and Host Modes)
DS40F1
AIS goes high when unframed all-ones condition (blue alarm) is detected, using the detection
criteria of less than three zeros out of 2048 bit periods.
BPV strobes high when a bipolar violation is detected in the received signal. B8ZS (or HDB3)
zero substitutions are not flagged as bipolar violations if the B8ZS (or HDB3) decoder has been
enabled.
DPM goes high if no activity is detected on MTIP and MRING.
LOS goes high when 175 consecutive zeros have been received. For the CS61535A, LOS returns
low when the ones density reaches 12.5% (based upon 175 bit periods starting with a one and
containing less than 100 consecutive zeros) as prescribed by ANSI T1.231-1993.
These pins are normally connected to TTIP and TRING and monitor the output of a CS61535A.
If the INT pin in the host mode is used, and the monitor is not used, writing "Clear DPM" to the
serial interface will prevent an interrupt from the driver performance monitor.
CS61535A
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