Ericsson MINI-LINK TN R4 ETSI Technical Description page 120

Technical Description
5.7.2.1 DCN in SDH
Figure 87
The following channels can be used for DCN transportation in SDH:
•
•
5.7.2.2 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. For LTU 155 the default bandwidth is
automatically established to DCCr=192 kbit/s and DCCm=192 kbit/s and DCCm
is configurable to 384 kbit/s and 576 kbit/s. SXU3 B supports the standard
compliant DCCr and DCCm. The bandwidth is fixed to DCCr=192 kbit/s and
DCCm=576 kbit/s. Between LTU 155 and SXU3 B only DCCr can currently be
used due to DCCm compatibility issues. This will be corrected in future release.
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. DCCm
can be used to connect MINI-LINK TN R4 to MINI-LINK TN R4 over an STM-1
connection. Please note that for this connection there can be no multiplexer
between the two MINI-LINK TN R4 NEs.
116
1-9
1-3
RSOH
AU Pointers
4
MSOH
5-9
Frame
128 kbit/s default channel available on radio side only (2*64 kbit/s in the
RFCOH).
192 kbit/s channel available on line side and radio side by using EOC or
DDC bites of the Regenerator Section Overhead Frame (RSOH) of the
SDH Frame.
10-274
Payload
+
RFCOH
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