
XRT86SH328
PRELIMINARY
186
28-CHANNEL DS1/E1 FRAMER/LIU WITH DS3 MUX & VT-MAPPER - SONET APPLICATIONS
REV. P1.0.6
BIT7 - Reserved
BIT6 - Remote DS2 Loop-back - DS2 Channel 6
This READ/WRITE bit-field is used to configure the XRT86SH328 to perform a Remote Loop-back of DS2 Channel 6.
If the user configures the XRT86SH328 to perform this loop-back, then the Receive Direction DS2 signal (associated
with Channel 6) will internally be looped back into the Transmit Direction.
`
0 - Configures DS2 Channel 6 to operate in the Normal (No Loop-back) Mode
`
1 - Configures DS2 Channel 6 to operate in the Remote Loop-back Mode.
Figure 13
presents an illustration of the Functional Block diagram of the XRT86SH328, whenever a given DS2
Channel has been configured to operate in the Remote DS2 Loop-back Mode.
BIT 5 - Remote DS2 Loop-back - DS2 Channel 5
See BIT6 description.
T
ABLE
245: DS3 F
RAMER
B
LOCK
- M23 L
OOP
-
BACK
A
CTIVATION
R
EGISTER
(A
DDRESS
= 0
X
0E0A)
BIT7
BIT6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Reserved
Remote DS2
Loop-back -
DS2 Chan-
nel 6
Remote DS2
Loop-back -
DS2 Chan-
nel 5
Remote DS2
Loop-back -
DS2 Chan-
nel 4
Remote DS2
Loop-back -
DS2 Chan-
nel 3
Remote DS2
Loop-back -
DS2 Chan-
nel 2
Remote DS2
Loop-back -
DS2 Chan-
nel 1
Remote DS2
Loop-back -
DS2 Chan-
nel 0
R/O
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
F
IGURE
13. A
N
I
LLUSTRATION
OF
THE
F
UNCTIONAL
B
LOCK
D
IAGRAM
OF
THE
XRT86SH328,
WHENEVER
A
GIVEN
DS2 C
HANNEL
HAS
BEEN
CONFIGURED
TO
OPERATE
IN
THE
R
EMOTE
DS2 L
OOP
-
BACK
M
ODE
STS-1/
STS-3
Telecom
Bus
Interface
Transmit
STS-1/3
TOH
Processor
Block
Receive
STS-1/3
TOH
Processor
Block
Transmit
STS-1 POH
Processor
Block
Receive
STS-1 POH
Processor
Block
VT/TU
De-Mapper
Block
Receive
DS3
Framer
Block
Transmit
DS3
Framer
Block
M23
MUX
Block
M23
De-MUX
Block
Ingress
Direction
Receive
DS1/E1
Framer
Block
Egress
Direction
Receive
DS1/E1
Framer
Block
Ingress
Direction
Transmit
DS1/E1
Framer
Block
Egress
Direction
Transmit
DS1/E1
Framer
Block
Receive
DS1/E1
LIU
Block
Transmit
DS1/E1
LIU
Block
DS3/
STS-1
LIU
Interface
M12
MUX
Block
M12
De-MUX
Block
DS1/E1
Jitter
Atten
Block
DS1/E1 Channel 0
DS1/E1 Channel 0
DS2 Channel 0
From DS1/E1 Channels 1 - 27
From DS2 Channels 1 - 6
To DS2 Channels 1 - 6
From DS1/E1 Channels 1 - 3
To DS1/E1 Channels 1 - 3
To DS1/E1
Channels 1 - 27
VT/TU
Mapper
Block
DS2 Remote Loop-back in
DS2 Channel 0