Functional Description
Transmit Side Telecom Bus Timing
Source
Add and Drop Configuration
In Figure the SXT6051 is used with the SXT6251 for the
implementation of an STM-1 Add/Drop multiplexer with
42 E1 access (63 is possible with the addition of another
SXT6251).
In an ADM configuration, the transmit side telecom
bus timing is provided to the SXT6051. Therefore the
timing at the transmit telecom bus is co-directional,
since both timing and data are provided to the
SXT6051.STM-1 ADM Configuration With 42 E1
Access
Receive Side Telecom Bus Timing
Source
Receive side telecom bus timing in the ADM case is
identical to the terminal case.
Figure 5: STM-1 ADM Configuration With 42 E1 Access
Telecom Bus Clock
EAST
WEST
Telecom
Bus Timing
Process TUG3 #1 TU-12's
Passthrough TUG3 #3 Timing
&
Clock
TB Timing
Telecom Bus Data
SXT 6251
SXT 6251
21E1 RX
Telecom Bus Data
21E1 TX
DTBTUG1
DTBTUG3
DTbTugEn
PTTUGA
PTTUGB
PTSOH
GND
VCC
SAP
RAP
SXT 6051
OHT
SXT 6051
OHT
RX
TX
TX
RX
SXT 6251 21 E1 card
Process TUG3 #2 TU-12's
SXT 6251
21E1 RX
SXT 6251
21E1 TX
DTBTUG2
DTbTugEn
PTTUGA
PTTUGB
GND
SAP
RAP
RAP
SAP
PTSOH
Process TUG3 #2 TU-12's
Insert E1
Telecom Bus Data
SXT 6251
21E1 TX
SXT 6251
21E1 RX
Telecom Bus Data
DTbTugEn
DTBTUG2
PTTUGA
GND
SXT 6051
OHT
PTTUGB
SXT 6051
OHT
PTSOH
TX
RX
TX
RX
RAP
SAP
Process TUG3 #1 TU-12's
Passthrough TUG3 #3 Timing
TB Timing
&
Clock
SXT 6251
SXT 6251
21E1 TX
21E1 RX
DTbTugEn
PTTUGA
PTTUGB
PTSOH
DTBTUG1
DTBTUG3
GND
VCC
STM1-ADMCONFIG.VSD- PAGE-1 - 2/4/98
TB Clock
25
l
LevelOne [ LEVEL ONE ]
