
PRELIMINARY
XRT86SH328
265
REV. P1.0.6
28-CHANNEL DS1/E1 FRAMER/LIU WITH DS3 MUX & VT-MAPPER - SONET APPLICATIONS
BIT7 - Transmit LOS Pattern:
This READ/WRITE bit-field configures the Transmit DS1 Framer block to generate and transmit the LOS Pattern to the
remote terminal.
`
0 - Configures the Transmit DS1 Framer Block to transmit normal DS1 traffic
`
1 - Configures the Transmit DS1 Framer Block to transmit the LOS pattern.
N
OTE
:
The user MUST set this bit-field to 0 for Normal Operation.
BIT6 - Reserved:
BIT [5:4] - Framer Loop-back[1:0]:
These two READ/WRITE bit-fields are used to configure the Transmit/Receive DS1 Framer blocks to operate in a
variety of possible loop-back modes, as depicted in the Table below.
BIT7 - Signaling Update on Super Frame Boundaries:
This READ/WRITE bit-field is used to either enable or disable Signaling Update on Super-Frame Boundaries, in both
the Transmit and Receive Directions, as described below.
In the Receive Direction
If the user enables this feature, then signaling data will update (via the Receive Signaling Array Registers) only upon
the Super-Frame Boundaries. If the user does NOT to enable this feature, then signaling data will be updated (within
the Receive Signaling Array Registers) as soon as they are received within the incoming DS1 data-stream.
In the Transmit Direction
If the user enables this feature, then any signaling data that occur (within the Transmit Output DS1 data-stream) will be
updated upon the Super-Frame boundaries. If the user does NOT to enable this feature, then signaling data (within the
outbound DS1 data-stream) will be updated as soon as it is changed.
`
0 = Disables the Signaling Update on Super-Frame Boundaries features.
`
1 = Enables the Signaling Update on Super-Frame Boundaries features.
BIT6 - Force CRC Errors:
This READ/WRITE bit-field is used to force the Transmit DS1 Framer block to transmit CRC errors within the outbound
DS1 data-stream.
`
0 = Configures the Transmit DS1 Framer block to transmit DS1 data with correct CRC values
Relationship between the Framer Loop-back[1:0] bit-fields and the Corresponding Loop-Back
Mode within the DS1 Framer block
F
RAMER
L
OOP
-
BACK
[1:0]
R
ESULTING
L
OOP
-B
ACK
M
ODE
(
WITHIN
F
RAMER
B
LOCK
)
00
Normal Operation (No Loop-back) Mode
01
Local Loop-back Mode
10
Remote Loop-back Mode
11
Reserved
T
ABLE
397: T1 F
RAMER
B
LOCK
- F
RAMING
S
ELECT
R
EGISTER
(A
DDRESS
= 0
X
N107,
WHERE
N
RANGES
IN
VALUE
FROM
0
X
01
TO
0
X
38)
BIT7
BIT6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Signaling
Update on
Super Frame
Boundaries
Force CRC
Errors
Set J1 Mode
One & Only
Fast Sync
DS1 Framing Format Select[2:0]
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0