
PRELIMINARY
XRT86SH328
217
REV. P1.0.6
28-CHANNEL DS1/E1 FRAMER/LIU WITH DS3 MUX & VT-MAPPER - SONET APPLICATIONS
a per-bit or per-frame basis, as described below.
Per-Bit Basis:
The M12 De-MUX will increment the DS3 Framer Block - PMON DS2 # 1 Framing Bit Error Count Register once for
each bit-error that it detects within the FAS bit-fields of the incoming G.747 data-stream.
Per-Frame Basis:
The M12 De-MUX will increment the DS3 Framer Block - PMON DS2 # 1 Framing Bit Error Count Register once for
each time it detects at least one bit-error within the FAS bit-fields of a given incoming G.747 frame.
`
0 - Configures the M12 De-MUX to increment the DS3 Framer Block - PMON DS2 # 1 Framing Bit Error Count
Register on a per-bit basis.
`
1 - Configures the M12 De-MUX block to increment the DS3 Framer Block - PMON DS2 # 1 Framing Bit Error Count
Register on a per-frame basis.
BIT 2 - DS2 LOF - M Bits
This READ/WRITE bit-field is used to select the M-Bit LOF (Loss of Frame) Defect criteria for the M12 De-MUX block
associated with DS2 Channel 1.
`
0 - Configures the M12 De-MUX block to declare the DS2 LOF defect condition whenever the M12 De-MUX block
detects M-bit errors within three (3) out of the four (4) most recently received DS2 M-frames.
`
1 - Configures the M12 De-MUX block to declares the DS2 LOF defect condition whenever the M12 De-MUX block
detects M-bit errors within two (2) out of the four (4) most recently received DS2 M-frames.
BIT 1 - DS2 LOF - M Bits Disable
This READ/WRITE bit-field is used to configure the M12 De-MUX block to not use M-bit errors as a reason/criteria for
declaring the DS2 LOF defect condition.
`
0 - Configures the M12 De-MUX block to declare the DS2 LOF defect condition, based upon the number of M-bit
errors (as selected in Bit 2 within this register).
`
1 - Configures the M12 De-MUX block to NOT declare the DS2 LOF defect condition, based upon the occurrences
of any M-bit errors.
BIT 0 - DS2 Reframe:
`
A 0 to 1 transition, within this bit-field commands the M12 De-MUX block to exit the Frame Maintenance mode, and
go back and enter the Frame Acquisition Mode.
N
OTE
:
The user should go back and set this bit-field to 0 following execution of the Reframe Command.
Bit [7:0] - See bit description for
Table 289
, above.
T
ABLE
290: DS3 F
RAMER
B
LOCK
- M12 DS2 # 2 F
RAMER
C
ONFIGURATION
R
EGISTER
(A
DDRESS
= 0
X
0E3B)
B
IT
7
B
IT
6
B
IT
5
B
IT
4
B
IT
3
B
IT
2
B
IT
1
B
IT
0
Unused
One and
Only
DS2 M-Sync
DS2 F-Sync
DS2 LOF
- F Bits/
G.747 FAS
Bit Error
Count
DS2 LOF
- M Bits
DS2 LOF
- M Bits
Disable
DS2
Reframe
R/O
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0