
PRELIMINARY
XRT86SH328
279
REV. P1.0.6
28-CHANNEL DS1/E1 FRAMER/LIU WITH DS3 MUX & VT-MAPPER - SONET APPLICATIONS
BIT [3:2] - Transmit Loop-Back Code Length[1:0]:
These two READ/WRITE bit-fields are used to specify the length of the loop-back codes that the Transmit DS1 Framer
block will transmit to the remote terminal equipment anytime the user commands it to transmit the User-Specified Loop-
code to the remote terminal equipment..
BIT 1 - Framed Loop-Back Code:
This READ/WRITE bit-field is used to configure the Transmit DS1 Framer and Receive DS1 Framer blocks to transmit
and detect either framed or un-framed loop-codes (for Code 0)..
`
0 = Configures the Transmit DS1 Framer block to transmit loop-codes within an unframed DS1 data-stream, and
configures the Receive DS1 Framer block to detect loop-codes within an unframed DS1 data-stream.
`
1 = Configures the Transmit DS1 Framer block to transmit loop-codes within a framed DS1 data-stream, and
configures the Receive DS1 Framer block to detect loop-codes within a framed DS1 data-stream.
BIT 0 - Loop-Back Automatically:
This READ/WRITE bit-field is used to configure the Channel to operate in the Auto Loop-back Mode. If the user
configures the Channel to operate in the Auto Loop-back Mode, then all of the following is TRUE.
The DS1 Framer block will automatically enter the Remote Loop-back Mode anytime the Receive DS1
Framer block detects and validates the Loop-up code within the incoming DS1 data-stream.
The DS1 Framer block will automatically exit the Remote Loop-back Mode anytime the Receive DS1 Framer
block detects and validates the Loop-Down code within the incoming DS1 data-stream.
`
0 = Does not configure the Channel to operate in the Auto Loop-Back Mode.
`
1 = Configures the Channel to operate in the Auto Loop-Back Mode
10
6 Bit Sequence
11
7 Bit Sequence
Transmit Loop-Back Code Length
T
RANSMIT
L
OOP
-B
ACK
C
ODE
L
ENGTH
[1:0]
L
ENGTH
00
4 Bit Sequence
01
5 Bit Sequence
10
6 Bit Sequence
11
7 Bit Sequence
T
ABLE
414: T1 F
RAMER
B
LOCK
- T
RANSMIT
L
OOP
-
BACK
C
ODE
R
EGISTER
(A
DDRESS
= 0
X
N125,
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
Transmit Loop-back Code[6:0]
Transmit
Loop-back
Code Enable
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
1
0
1
0
1
0
1
0
Receive Loop-Back Code De-activation Length
R
ECEIVE
L
OOP
-B
ACK
C
ODE
D
E
-
ACTIVATION
L
ENGTH
[1:0]
L
ENGTH