Specifications

Watson TDM
Operating Manual
Watson-TDM-Manual-W.doc
Version 2.0-01
3-20
Revision: 2008-02-07
3.5.3 Multiservice and Mixed Mode mappings
When both E1 and nx64 kbit/s interface are equipped, they can be used concur-
rently (multiservice application). The available DSL bandwidth is shared between
the timeslots of the E1 interface and the timeslots of the nx64 kbit/s interface. In
multiservice applications the nx64 data occupies always the first bearer channels
of the DSL frame, the E1 timeslots are transmitted after the nx64 timeslots.
E1 and nx64 user interfaces can be mixed on a DSL link, allowing to transport
nx64 data in E1 timeslots without further converters. This is called Mixed Mode
mapping:
DSLSTU-C STU-R
E1 nx64
B
1
B
2
...
B
n
TS
0
TS
1
TS
2
...
TS
n
TS
n+1
...
TS
31
N
1
N
2
...
N
n
nx64 payload
Unused timeslots (11111111)
Figure 3-14: Mixed mode mapping
Mixed mode and multiservice can be combined on a DSL link, allowing a frac-
tional E1 signal and nx64 data to be transported over a single E1:
DSLSTU-C STU-R
B
1
B
2
...
TS
0
TS
1
TS
2
...
TS
n
TS
n+1
...
TS
n+m
N
1
N
2
...
N
n
Synchronization (TS0)
nx64 payload
Unused timeslots (11111111)
E1
E1
nx64
TS
0
TS
1
TS
2
...
TS
m
B
n
B
n+1
B
n+2
...
B
n+m+1
...
TS
31
Fractional E1 payload
TS0 mapping mode 1 (MP 1): TS0 transmitted over DSL
Figure 3-15: Mixed Mode multiservice mapping