ADTRAN MX2800 M13 User Manual page 190

Appendix E, Glossary
Y
yellow alarm
E-8
A T3 yellow alarm is an indication sent back toward the source of a failed transmit
circuit in a DS3 two-way transmission path. The X-bits (X1 and X2) are set to
zero.
MX2800 M13 Multiplexer User Manual
61200290L1-1G