SXT6051 STM-1/0 SDH Overhead Terminator
Table 2: Signal Description (Sheet 5 of 11)
Pin #
Name
Type
Description
Configuration & Alarm Monitoring
181
OOF
O
Out of Frame Indicator. Active High when framer enters in
an out of frame state. Minimum pulse width is 125 us (1
frame).
HiZ-2ma
180
182
183
179
184
176
LOF
SD
O
Loss of Frame Indicator. Active High when the framer enters
a loss of frame state. Minimum pulse width is 125 us (1 frame).
HiZ-2ma
O
Signal Degrade. State of register 21H<bit 1> bit value.
HiZ-2ma
SF
O
Signal Fail. State of register C1H<bit 5> bit value.
HiZ-2ma
AISRX
O
Receive AIS Signal Indicator. Indicates that an AIS has been
detected in the received VC3 or VC4. Active High.
HiZ-2ma
SCRAMSEL
STMMODE
I
Scrambler Disable. This pin should be tied to Low during nor-
mal operation. Active High.
TTLin
I
Mode Select. Low selects STM-0, High selects an STM-1.
TTLin
Orderwire and Data Byte Access Transmit Side
18
19
20
21
22
32
33
34
TROW
I
Transmit RSOH E1 Orderwire. A 64 Kb/s data input for
orderwire byte E1. Data is synchronized with TOWBYC and
clocked by TOWC.
TTLin
TOWC
O
Transmit RSOH and MSOH Orderwire Clock. A reference
clock output at 64 KHz to be used for transmit E1, E2 and F1
byte clocking.
HiZ-2ma
TMOW
TDOW
I
Transmit MSOH E2 Orderwire. A 64 Kb/s data input for
orderwire byte E2. Data is synchronized with TOWBYC and
clocked by TOWC.
TTLin
I
Transmit RSOH F1 Orderwire. A 64 Kb/s data input for
orderwire byte F1. Data is synchronized with TOWBYC and
clocked by TOWC.
TTLin
TOWBYC
TPOW1
TPOW2
TPOWC
O
Transmit RSOH and MSOH Orderwire Synchronization
Signal. An 8 KHz signal used to byte synchronize the transmit-
ted E1, F1 and E2 data streams.
HiZ-2ma
I
Transmit HPOH F2 Orderwire. A 64 Kb/s data input for
orderwire byte F2. Data is synchronized with TPOWBYC and
clocked by TPOWC.
TTLin
I
Transmit HPOH F3 Orderwire. A 64 Kb/s data input for
orderwire byte F3 Data is synchronized with TPOWBYC and
clocked by TPOWC.
TTLin
O
Transmit HPOH Orderwire Clock. A reference clock output
HiZ-2ma
at 64 KHz to be used for F2 and F3 transmit byte clocking.
12
LevelOne [ LEVEL ONE ]
