Ericsson MINI-LINK TN R3 ETSI Technical Description page 122

MINI-LINK TN R3 ETSI
6.7.2.2 DCCr/DCCm
The DCCr/DCCm overhead sections in the STM-1 frame can be used to
transport DCN traffic. A PPP connection is established over the overhead
segments between two end points. The default bandwidth is automatically
established to DCCr=192 kbit/s and DCCm=192 kbit/s. DCCm is configurable
to 384 kbit/s and 576 kbit/s.
The PPP connection in the overhead segments is implemented as PPP over bit
synchronous HDLC. Any 3rd party equipment that complies with this and the
channel bandwidth segmentation can interoperate with MINI-LINK TN. Typically
the DCCr is used to connect MINI-LINK TN R3 to MINI-LINK HC over an STM-1
connection. DCCm can be used to connect MINI-LINK TN R3 to MINI-LINK TN
R3 over an STM-1 connection. Please note that for this connection there can
be no multiplexer between the two MINI-LINK TN R3 NEs.
6.7.2.3 Structured/Unstructured E1
MINI-LINK TN R3 can use up to two of its connected E1s for transport of IP
DCN. The following options are available:
•
•
6.7.2.4 nx64 kbit/s
nx64 kbit/s timeslots can be used for IP DCN as described in Section 6.7.2.3
on page 116.
6.7.2.5 2xE0
A PPP/E0 connection can be established to an external device from the SMU2.
6.7.2.6 DCC Radio Terminal
Each Radio Terminal provides a DCC of nx64 Kbits, where 2≤n≤9 depending
on traffic capacity and modulation, transported in the radio frame overhead.
116
Dedicated E1 for DCN
A structured or unstructured E1 can be dedicated for DCN. For the
structured E1, nx64 kbit/s timeslots can be configured for DCN transport.
The remaining timeslots are unused, that is cannot be used to transport
traffic. For the unstructured E1, the entire 2 Mbit/s is used for DCN
transport.
E1 with traffic pass-through
In a structured E1 used for traffic, nx64 kbit/s timeslots can be used for
DCN transport. The DCN is inserted into the nx64 kbit/s timeslots internally
in the NE. The timeslots used for traffic is cross-connected in normal
manner through the NE.
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