
XRT86SH328
PRELIMINARY
208
28-CHANNEL DS1/E1 FRAMER/LIU WITH DS3 MUX & VT-MAPPER - SONET APPLICATIONS
REV. P1.0.6
BIT [7:0] See
Table 272
above for bit descriptions, substituting Channel [27:24] for Channel [3:0}.
BIT7 - Force Transmit DS3 FERF/RDI Indicator
This READ/WRITE bit-field is used to force the Transmit DS3 Framer block to transmit the FERF/RDI indicator to the
remote terminal equipment by setting both of the X-bits (within each outbound DS3 frame) to 0.
`
0 - Does not force the Transmit DS3 Framer block to transmit the DS3 FERF/RDI indicator. In this case, the Transmit
DS3 Framer block will set the X bits (within each outbound DS3 frame) to the appropriate value, depending upon receive
conditions (as detected by the Receive DS3 Framer block).
`
1 - Forces the Transmit DS3 Framer block to transmit the DS3 FERF/RDI indicator. In this case, the Transmit DS3
Framer block will force the X bits (within each outbound DS3 frame) to 0.
N
OTE
:
For normal operation (e.g., where the Transmit DS3 Framer Block will automatically transmit the FERF/RDI
indicator whenever the Receive DS3 Framer block declares either the LOS, AIS or LOF/OOF defect conditions)
the user MUST set this bit-field to 0.
BIT6 - Force X-Bits to 1
This READ/WRITE bit-field is used to force the Transmit DS3 Framer block to set the X-bits (within each outbound DS3
frame) to 1.
`
0 - Configures the Transmit DS3 Framer block to automatically set the X bits to the appropriate value, depending upon
the receive conditions (as detected by the Receive DS3 Framer block).
`
1 - Configures the Transmit DS3 Framer block to force all of the X bits (within the outbound DS3 data-stream) to 1.
In this configuration setting, the Transmit DS3 Framer block will set all X bits to 1 independent of whether the Receive
DS3 Framer block is currently declaring any defect conditions.
N
OTE
:
For normal operation (e.g., where the Transmit DS3 Framer block will automatically transmit the FERF/RDI
indicator whenever the Receive DS3 Framer block declares the LOS, AIS or LOF/OOF defect condition) the
user MUST set this bit-field to 0.
BIT 5 - Transmit DS3 Idle Signal
This READ/WRITE bit-field is used to force the Transmit DS3 Framer block to transmit the DS3 Idle Signal pattern to
the remote terminal equipment, as described below.
`
0 - Configures the Transmit DS3 Framer block to transmit normal traffic to the remote terminal equipment.
`
1 - Configures the Transmit DS3 Framer block to transmit the DS3 Idle Pattern to the remote terminal equipment.
N
OTES
:
1.
This bit-field is ignored if Bits 3 (Transmit LOS Indicator) or 4 (Transmit AIS Indicator) are set to 1.
2.
The exact pattern that the Transmit DS3 Framer block will transmit (whenever this bit-field is set to 1)
depends upon the contents within Bits 3 through 0 (Transmit DS3 Idle Pattern[3:0]) within the DS3 Framer
Block - Transmit DS3 Pattern Register (Address = 0x0E4C).
BIT 4 - Transmit AIS Indicator
This READ/WRITE bit-field is used to force the Transmit DS3 Framer block to transmit the DS3 AIS indicator to the
remote terminal equipment as described below.
`
0 - Configures the Transmit DS3 Framer block to transmit normal traffic (based upon T1/E1 data that has been
multiplexed into a DS3 data-stream) to the remote terminal equipment.
`
1 - Configures the Transmit DS3 Framer block to transmit the DS3 AIS indicator to the remote terminal equipment.
N
OTES
:
T
ABLE
279: DS3 F
RAMER
B
LOCK
- T
RANSMIT
DS3 C
ONFIGURATION
R
EGISTER
(A
DDRESS
= 0
X
0E30)
BIT7
BIT6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Force DS3
Tx
FERF/RDI
Force X-Bits
to 1
Transmit
DS3 Idle
Signal
Transmit AIS
Indicator
Transmit
LOS
Indicator
Transmit
FERF/RDI
upon LOS
Transmit
FERF/RDI
upon LOF
Transmit
FERF/RDI
upon AIS
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
1
1
1