PRELIMINARY
PM4318 OCTLIU
DATASHEET
PMC- 2001578
ISSUE 3
OCTAL E1/T1/J1 LINE INTERFACE DEVICE
Register 00AH, 08AH, 10AH, 18AH, 20AH, 28AH, 30AH, 38AH:
Transmit Line Interface Configuration
Bit
Type
Function
Default
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
TJATBYP
TAISEN
TAUXP
SBI_AIS
TDUAL
AMI
0
0
0
1
0
0
0
1
TINV
TRISE
TJATBYP:
The TJATBYP bit enables the transmit jitter attenuator to be removed from the transmit data
path. When the transmit jitter attenuator is bypassed, the latency through the transmitter
section is reduced by typically 40 bits.
TAISEN:
The TAISEN bit enables the interface to generate an unframed all-ones AIS alarm on the
TXTIP[n] and TXRING[n]. When TAISEN is set to logic 1, the bipolar TXTIP[n] and
TXRING[n] outputs are forced to pulse alternately, creating an all-ones signal. The transition
to transmitting AIS on the TXTIP[n] and TXRING[n] outputs is done in such a way as to avoid
introducing any bipolar violations.
The diagnostic digital loopback point is prior to the AIS insertion point.
(Implementation note. TAISEN has priority over TAUXP, which in turn has priority over
TDATINV.).
TAUXP:
The TAUXP bit enables the interface to generate an unframed alternating zeros and ones (i.e.
010101…) auxiliary pattern (AUXP) on the TXTIP[n] and TXRING[n]. When TAUXP is set to
logic 1, the bipolar TXTIP[n] and TXRING[n] outputs are forced to pulse alternately every
other cycle. The transition to transmitting AUXP on the TXTIP[n] and TXRING[n] outputs is
done in such a way as to avoid introducing any bipolar violations.
The diagnostic digital loopback point is prior to the AUXP insertion point.
SBI_AIS:
The SBI_AIS bit enables the insertion of AIS in the transmit path in response to an alarm
indication from the SBI interface. When SBI_AIS is set to logic 1, setting the ALM (alarm) bit
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
71
PMC [ PMC-SIERRA, INC ]
