Rainbow Electronics DS3170 - Manual (Page 71)

DS3170 DS3/E3 Single-Chip Transceiver
71 of 233
Figure 9-8. Transmit Error Insert Logic
BERT ERROR
INSERT
BERT.TEICR.MEIMS
BERT.TEICR error
insertion bit
0
1
0
1
PORT.CR.MEIMS
PORT.CR.TMEI
0
1
GL.CR1.MEIMS
GL.CR1.TMEI
GPIO6 PIN
(TMEI)
0
1
T3.TEIR.MEIMS
T3.TEIR error
insertion bit
0
1
T3 ERROR
INSERT
9.5 Port Resources
9.5.1 Loopbacks
There are several loop back paths available. The following table lists the loopback modes available for analog
loopback (ALB), line loopback (LLB), payload loopback (PLB) and diagnostic loopback (DLB). The LBM bits are
located in
PORT.CR4.
Table 9-17. Loopback Mode Selections
LBM[2:0] ALB LLB PLB DLB
000 0 0 0 0
001 1 0 0 0
010 0 1 0 0
011 0 0 1 0
10X 0 0 0 1
110 0 1 0 1
111 0 0 0 1