
XRT86SH328
PRELIMINARY
220
28-CHANNEL DS1/E1 FRAMER/LIU WITH DS3 MUX & VT-MAPPER - SONET APPLICATIONS
REV. P1.0.6
This READ/WRITE bit-field (along with the Transmit AIS - Unframed All Ones bit-field) is used to define the type of AIS
data-stream that the Transmit DS3 Framer block will transmit, as described below.
`
0 - Configures the Transmit DS3 Framer block to force all of the C bits to 0 when it is configured to transmit a Framed
AIS signal.
`
1 - Configures the Transmit DS3 Framer block to NOT force all of the C bits to 0 when it is configured to transmit a
Framed AIS signal. In this case, the C bits can be used to transport FEAC or PMDL Messages.
N
OTE
:
This bit-field is ignored if the Transmit DS3 Framer block has been configured to transmit an Unframed - All
Ones type of AIS signal.
BIT 5 - Transmit AIS - Ignore Overhead Data from TxDS3OH Port
This READ/WRITE bit-field permits the Transmit DS3 Framer block to either accept or ignore externally supplied DS3
Overhead data, whenever it (the Transmit DS3 Framer block) is transmitting the AIS indicator.
If this feature is used, then (for the duration that the Transmit DS3 Framer block is commanded to transmit the DS3 AIS
indicator) the Transmit DS3 Framer block will NOT allow the users to externally insert their DS3 OH bits within the
outbound DS3 data-stream, even if the TxOH Source bit-field is set to 1 and if the corresponding F-Bit Mask bit-field is
set to 0.
Conversely, if the user does NOT use this feature, then the Transmit DS3 Framer block will allow the users to externally
insert theirr own DS3 OH bits (within the outbound DS3 data-stream) even when the Transmit DS3 Framer block is
transmitting the DS3 AIS indicator to the remote terminal equipment.
`
0 - Does NOT invoke the Ignore TxDS3OH Port During AIS Feature
`
1 - Invokes the Ignore the TxDS3OH Port During AIS feature.
BIT 4 - Transmit LOS Pattern Select:
This READ/WRITE bit-field is used to configure the Transmit DS3 Framer block to transmit either an All Zeros or an All
Ones pattern, anytime it is configured to transmit the LOS Pattern to the remote terminal equipment, as described below.
`
0 - Configures the Transmit DS3 Framer block to transmit an All Zeros pattern whenever it is configured to transmit
the LOS pattern.
`
1 - Configures the Transmit DS3 Framer block to transmit an All Ones pattern whenever it is configured to transmit
the LOS pattern.
BIT[3:0] - Transmit DS3 Idle Pattern[3:0]
These READ/WRITE bit-fields are used to specify the type of framed, repetitive four-bit pattern that the Transmit DES3
Framer block should generate and transmit, whenever it is configured to transmit the DS3 Idle Pattern.
N
OTE
:
Setting these bit-fields to [1, 1, 0, 0] configures the Transmit DS3 Framer block to transmit the standard
Framed, repeating 1, 1, 0, 0, … pattern (per Bellcore GR-499-CORE) requirements.
Bits 7 - 5 - Unused
BIT 4 - Auto DS1/E1 AIS upon DS3 LOS Defect
This READ/WRITE bit-field is used to configure all of the Egress Direction Transmit DS1/E1 Framer blocks (within the
XRT86SH328) to automatically transmit the DS1/E1 AIS indicator via the downstream DS1/E1 signals, anytime (and for
the duration that) the Receive DS3 Framer block declares the LOS defect condition.
`
0 - Does not configure all Egress Direction Transmit DS1/E1 Framer blocks to automatically transmit the DS1/E1 AIS
indicators via the downstream DS1/E1 signals, anytime the Receive DS3 Framer block declares the LOS defect
T
ABLE
297: DS3 F
RAMER
B
LOCK
- A
UTO
T1/E1 AIS
UPON
DS3 D
EFECT
C
ONDITION
R
EGISTER
(A
DDRESS
=
0
X
0E4D)
BIT7
BIT6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Unused
Auto
DS1/E1AIS
upon DS3
LOS Defect
Unused
Auto DS1/E1
AIS upon
DS3 OOF
Defect
Unused
Auto DS1/E1
AIS upon
DS3 AIS
Defect
R/O
R/O
R/O
R/W
R/O
R/W
R/O
R/W
0
0
0
0
0
0
0
0