
PRELIMINARY
XRT86SH221
II
REV. P1.0.5
SDH-TO-PDH FRAMER/MAPPER WITH INTEGRATED 21-CHANNEL E1 SH LIU
F
IGURE
15. T
OP
L
EVEL
B
LOCK
D
IAGRAM
........................................................................................................................................ 42
4.6 INTERRUPTS AND STATUS ............................................................................................................................ 43
F
IGURE
16. I
NTERRUPT
H
IERARCHY
............................................................................................................................................... 43
4.7 INTERRUPT PROCESSING AND CONTROL .................................................................................................. 44
4.8 STM-0/1 RECEIVE TRANSPORT PROCESSOR.............................................................................................. 44
F
IGURE
17. BYTE_ALIGN B
LOCK
F
UNCTIONAL
D
IAGRAM
.............................................................................................................. 44
T
ABLE
1: 16-
BYTE
FRAME
FOR
T
RAIL
API
D
..................................................................................................................................... 49
F
IGURE
18. R
ECEIVE
T
RACE
B
UFFER
M
EMORY
............................................................................................................................... 50
T
ABLE
2: A
DDRESSING
S
CHEME
U
SED
TO
A
CCESS
THE
SDH OH B
YTES
........................................................................................ 51
F
IGURE
19. R
ECEIVE
T
RANSPORT
O
VERHEAD
I
NTERFACE
T
IMING
................................................................................................... 52
STM-0/1 RECEIVE PATH PROCESSOR................................................................................................. 53
F
IGURE
20. P
OINTER
P
ROCESSING
FSM........................................................................................................................................ 55
T
ABLE
3: SDH P
OINTER
E
VENT
T
YPES
.......................................................................................................................................... 55
F
IGURE
21. C
ONCATENATED
P
OINTER
I
NDICATOR
P
ROCESSING
FSM.............................................................................................. 57
T
ABLE
4: RDI-P S
ETTINGS
AND
I
NTERPRETATION
........................................................................................................................... 58
T
ABLE
5: STS S
IGNAL
L
ABEL
M
ISMATCH
D
EFECT
C
ONDITIONS
....................................................................................................... 59
T
ABLE
6: T
RUTH
T
ABLE
FOR
P
ATH
L
ABEL
E
RROR
C
ONDITIONS
....................................................................................................... 59
F
IGURE
22. P
ATH
O
VERHEAD
I
NTERFACE
T
IMING
............................................................................................................................ 62
F
IGURE
23. T
RANSMIT
T
RANSPORT
O
VERHEAD
I
NTERFACE
T
IMING
................................................................................................. 63
4.9 TELECOM BUS INTERFACE............................................................................................................................ 68
4.9.1 TRANSMIT TELECOM BUS......................................................................................................................................... 68
F
IGURE
24. T
RANSMIT
T
ELECOM
B
US
I
NTERFACE
T
IMING
................................................................................................................ 68
4.9.2 2KHZ MODE IN STM-1 ................................................................................................................................................. 69
F
IGURE
25. C1J1V1 P
ULSE
IN
STM-1 2
K
H
Z
M
ODE
........................................................................................................................ 69
4.9.3 RECEIVE TELECOM BUS............................................................................................................................................ 69
F
IGURE
26. R
ECEIVE
T
ELECOM
B
US
I
NTERFACE
T
IMING
.................................................................................................................. 69
4.10 VT MAPPER .................................................................................................................................................... 71
F
IGURE
27. I
NTERNAL
B
US
S
TRUCTURE
......................................................................................................................................... 71
F
IGURE
28. M
ID
B
US
I
NTERFACE
.................................................................................................................................................... 73
F
IGURE
29. SDH
TO
VTM
DATA
TRANSFER
WITH
ZERO
POINTER
OFFSET
......................................................................................... 73
F
IGURE
30. VTM
TO
SDH
DATA
TRANSFER
.................................................................................................................................... 74
F
IGURE
31. E1 I
NTERFACE
T
IMING
(I
NTERNAL
TO
THE
C
HIP
)........................................................................................................... 75
F
IGURE
32. E1 I
NTERFACE
T
IMING
(E1
SYNCHRONOUS
MAPPING
, I
NTERNAL
TO
THE
C
HIP
)............................................................... 75
T
ABLE
7: V5 - VT P
ATH
E
RROR
C
HECKING
, S
IGNAL
L
ABEL
AND
P
ATH
S
TATUS
................................................................................ 76
T
ABLE
8: N2
BYTE
STRUCTURE
...................................................................................................................................................... 78
T
ABLE
9:
B
7-
B
8
MULTIFRAME
STRUCTURE
....................................................................................................................................... 79
T
ABLE
10: S
TRUCTURE
OF
FRAMES
# 73 - 76
OF
THE
B
7-
B
8
MULTIFRAME
....................................................................................... 79
T
ABLE
11: K4 (
B
5-
B
7)
CODING
AND
INTERPRETATION
...................................................................................................................... 81
T
ABLE
12: Z7/K4 - VT P
ATH
G
ROWTH
AND
VT P
ATH
R
EMOTE
D
EFECT
I
NDICATION
........................................................................ 81
F
IGURE
33. MKP (M
AKE
P
AYLOAD
),
ONE
OF
SEVEN
MKG : M
AKE
VT/TU G
ROUP
........................................................................... 82
F
IGURE
34. MKP (M
AKE
P
AYLOAD
), VT/TU G
ROUP
I
NTERLEAVING
................................................................................................. 83
F
IGURE
35. M
AKE
T
RIBUTARY
(MKT)............................................................................................................................................. 84
F
IGURE
36. E
XTRACT
P
AYLOAD
(XTP)........................................................................................................................................... 85
F
IGURE
37. R
EFERENCE
C
LOCKS
G
ENERATOR
(RCG).................................................................................................................... 86
DATA INTERFACE BETWEEN SDH/FRAMER AND MAPPER .............................................................. 87
F
IGURE
38. R
ECEIVE
SDH/F
RAMER
-ATM I
NTERFACE
..................................................................................................................... 87
F
IGURE
39. T
RANSMIT
SDH/F
RAMER
M
APPER
I
NTERFACE
............................................................................................................... 87
F
IGURE
40. E1 F
RAMER
S
YNCHRONIZATION
F
LOW
D
IAGRAM
.......................................................................................................... 88
F
IGURE
41. F
LOW
OF
CRC-4
MULTIFRAME
ALIGNMENT
FOR
INTERWORKING
.................................................................................... 90
4.11 E1 PHY LOOPBACK DIAGNOSTICS............................................................................................................. 93
4.11.1 E1 LOOPBACKS......................................................................................................................................................... 93
F
IGURE
42. E1 F
ACILITY
L
OOPBACK
............................................................................................................................................... 93
4.11.2 E1 FACILITY I/O LOOPBACK.................................................................................................................................... 94
F
IGURE
43. E1 F
ACILITY
I/O L
OOPBACK
......................................................................................................................................... 94
4.11.3 E1 MODULE LOOPBACK ......................................................................................................................................... 95
F
IGURE
44. E1
MODULE
L
OOPBACK
................................................................................................................................................ 95
4.11.4 ALARM AND AUTO AIS............................................................................................................................................. 96
F
IGURE
45. E1 A
UTO
AIS I
NSERTION
............................................................................................................................................. 96
T
ABLE
13: E1
TO
STM-0 -
RESPONSE
TIME
< 125
US
..................................................................................................................... 96
T
ABLE
14: STM-0
TO
E1 -
RESPONSE
TIME
< 125
USEC
................................................................................................................. 96
5.0 ANALOG FRONT END / LINE INTERFACE UNIT (LIU) SECTION...................................................... 98
F
IGURE
46. S
IMPLIFIED
B
LOCK
D
IAGRAM
OF
THE
LIU S
ECTION
....................................................................................................... 98
5.1 TRANSMIT LINE INTERFACE UNIT................................................................................................................. 99
5.1.1 JITTER ATTENUATOR................................................................................................................................................. 99
5.1.2 TAOS (TRANSMIT ALL ONES).................................................................................................................................... 99