Rainbow Electronics DS3170 - Manual (Page 92)

DS3170 DS3/E3 Single-Chip Transceiver
92 of 233
Figure 9-17. G.832 E3 Frame Format
FA1
EM
TR
MA
NR
GC
FA2
530 Byte Payload
59 Columns
9 Rows
Figure 9-18. MA Byte Format
RDI - Remote Defect Indicator
REI - Remote Error Indicator
SL - Signal Label
MI - Multi-frame Indicator
TM - Timing Marker
RDI REI SL SL SL MI MI TM
MSB
1
LSB
8
Table 9-29 shows the function of each overhead bit in the DS3 Frame.
Table 9-29. G.832 E3 Frame Overhead Bit Definitions
BYTE DEFINITION
FA1, FA2 Frame Alignment bytes
EM Error Monitoring byte
TR Trail Trace byte
MA Maintenance and Adaption
byte
NR Network Operator byte
GC General Purpose
Communication Channel byte