Description: This object describes 5 attributes of Overhead bits. The Overhead bits contains the ISDN U interface transceiver operations and maintenance functions that are handled by M4, M5 and M6 bits in the superframe. These bits are described as follows: act - start-up bit; this bit is set to binary ONE by the network as a part of the start-up sequence to communicate readiness for layer-2 communication. dea - turn-off bit; this bit is set to binary ZERO by the network to communicate to the NT its intention to turn off. febe - Far End Block Error bit; this bit is set to binary ONE if there are no error in the superframe and binary ZERO if the superframe contains an error. uoa - U interface only activation bit; This bit is set to binary ONE if the S/T interface should be activated. Otherwise, this bit should be set to binary ZERO. aib - Alarm indication bit; this bit is set to binary ONE if the transmission path for D, B1, and B2 channels has been established all the way to the local exchange. Otherwise, this bit is set to binary ZERO.