Rainbow Electronics DS3170 - Manual (Page 134)

DS3170 DS3/E3 Single-Chip Transceiver
134 of 233
Register Name: PORT.CR1
Register Description: Port Control Register 1
Register Address: 040h
Bit
# 15 14 13 12 11 10 9 8
Name RESERVED PAIS2 PAIS1 PAIS0 LAIS1 LAIS0 BENA RESERVED
Default 0 0 0 0 0 0 0 0
Bit # 7 6 5 4 3 2 1 0
Name TMEI MEIM -- PMUM PMU PD RSTDP RST
Default
0 0 -- 0 0 1 1 0
Bits 14 to 12: Payload AIS Select [2:0] (PAIS[2:0]). This bit controls when an unframed all ones signal is forced
on the receive data path after the receive framer and payload loopback mux. Default: Payload AIS always sent.
PAIS[2:0]
PORT.CR1
WHEN AIS IS SENT AIS CODE
000 Always UA1
001 When LLB (no DLB) active UA1
010 When PLB active UA1
011 When LLB(no DLB) or PLB active UA1
100 When LOS (no DLB) active UA1
101 When OOF active UA1
110 When OOF, LOS. LLB (no DLB), or
PLB active UA1
111 Never none
Bits 11 to 10: Line AIS Select [1:0] (LAIS[1:0). These bits control when a DS3 framed AIS or an unframed all
ones signal is to be transmitted on TPOS/TNEG and/or TXP/TXN. The signal on TPOS/TNEG can be AMI or
unipolar. This signal is sent even when in diagnostic loopback and always over-rides signals from the framers.
Default: AIS sent if DLB is enabled.
LAIS[1:0]
PORT.CR1
FRAME MODE DESCRIPTION AIS CODE
00
DS3
Automatic AIS when DLB is enabled
( PORT.CR4 .LBM = 1XX)
DS3AIS
00 E3 Automatic AIS when DLB is enabled UA1
01 Any Send UA1 UA1
10 DS3 Send AIS DS3AIS
10 E3 Send AIS UA1
11 Any Disable none
Bit 9: BERT Enable (BENA). This bit is used to enable the transmit BERT logic; the receive BERT is always
enabled. The BERT pattern will replace the the system interface datastream (TSER) into the payload datastream.
0 = Tranmit BERT logic disabled and powered down