MT8926 View Datasheet(PDF) - Mitel Networks
Part Name
Description
Manufacturer
MT8926 Datasheet PDF : 26 Pages
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MT8926
CSTo
T1
0-2 3 4-6 7 8-10 11 12-14 15
PCSW PS PCSW PM PCSW CRC PCSW MS
W
SW
W1
16-18 19 20-22 23 24-26 27 28-30 31
PCSW EF PCSW BPV PCSW Rx PCSW MS
EC
2 BOM
W2
1-3
4-6
7-9
10-12
13-15
16-18
19-21
22-24
PMAC Miscellaneous
Cyclic Redundancy
Check-6 Error Counter
Errored Frame
Event Counter
Received Bit-Oriented
Message Register
Status Word
Bit
Function
7-5
Not Used
4
LLDD (001)
Bit Function
7
MSB
0
LSB
Bit
Function
7-4 SE (MSB-LSB)
3-0 FE (MSB-LSB)
Bit Function
7
Received First
0
Received Last
3
LLED (00001)
2
FECV
Master Status Word 1
Bipolar Violation Counter
Master Status Word 2
1
TMR (2SEC)
0
BOMV
Bit
Function
Bit Function
Bit
Function
7*
6*
5
4
PCSW = Per Channel Status Word
PSW = Phase Status Word
* MT8976/77 Data unaltered by
the MT8926
3*
2
1*
0*
YLALR
MIMIC
ALRM
RAI (ESF YELLOW)
MFSYNC
LOS
SLIP
SYN
7
MSB
0
LSB
7*
BlAlm
6*
FrCnt
5*
Xst
4
SEI
3
FSI
2
CSI
1
BSI
0
AIS
Figure 5 - CSTo Channel Allocation Versus T1 Channels
connects to DSTi1 of the PMAC and to the receive
side of the system. This allows the PMAC to perform
a payload loopback by internally connecting DSTi1 to
DSTo. In normal operation, transmit data will flow
from DSTi0 to DSTo of the PMAC to DSTi of the
MT8976/77.
normal operation). In the reset state, data entering
the PMAC on FDLi, DSTi0 and CSTi0 will pass
through unaltered to FDLo, DSTo and CSTo
respectively. E8Ko will be high, IRQ will be high
impedance and the 1SEC output (and TMR bit) will
be low.
PMAC RESET
The MT8926 functions may be suspended by making
the RESET input low (RESET must be high for
After the MT8976/77 has acquired frame synchroni-
zation and RESET returns high, the MT8926 will
require two superframes to acquire synchronization
and two ST-BUS frames to align to the ST-BUS.
RESET can be used to prevent DS1 interface
ST-BUS Transmit
Data Stream
ST-BUS Receive
Data Stream
MT8926
Repeating
001
To PMAC
Control
CSTi1
4 to 1 MUX
Repeating
00001
DSTi0
DSTi1
DSTo
From System
Control
MT8976/77
RxA
RxB
ECLK
CSTi1
TxA
DSTi
DSTo TxB
LCW = Loopback Control Word
LCW
LCW
00
01
10
11
Function
DSTi0 to DSTo
DSTi1 to DSTo
00001 to DSTo (activate)
001 to DSTo (deactivate)
Figure 6 - Payload and Line Loopback Operation
4-8
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