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OSN 500 550 580 V100R008C50 Commissioning and Configuration Guide 02

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Configuring Point-to-Point Nx8 kbit/s Services

Configuring Point-to-Point Nx8 kbit/s Services

Point-to-point Nx8 kbit/s services provide a solution to transmitting smaller signals on a digital data network, increasing network resource utilization. The configuration method described in this section is applicable to Nx8 kbit/s services access to transmission equipment.

Networking Diagram

One 4.8 kbit/s service need to be transmitted between NE1 and NE2. It is received through a DDN port and cross-connected to a 8 kbit/s channel for transmission between NE1 and NE2 using the V.110 interface protocol.

Figure 2-39 shows the point-to-point 8 kbit/s services.

Figure 2-39  Point-to-point 8 kbit/s service configuration


This topic considers the OptiX OSN 580 as an example to describe the board layout. In the case of other products, the configuration method is the same, except for the slots. For the slot information, see the Hardware Description of the relevant product.

Signal Flow and Timeslot Allocation

A DXM board receives a channel of 4.8 kbit/s DDN services through its DDN serial port, encapsulates the 4.8 kbit/s DDN services into an 8 kbit/s service, and transmits the 8 kbit/s service to an SDH network. The SDH network transparently transmits the 8 kbit/s service to a remote node.

NE1 and NE2 each use one 8 kbit/s timeslot to transmit DDN services. Table 2-74 describes the 8 kbit/s service timeslot allocation.

Table 2-74  8 kbit/s service timeslot allocation
NE Board Source E1 Source Timeslot Range(e.g. 1) Source Bit(e.g.1,3-6) Sink E1 Sink Timeslot Range(e.g. 1) Sink Bit(e.g.1,3-6)
NE1 7-DXM DDN19 1 1 2M-1 1 1
NE2 7-DXM DDN19 1 1 2M-1 1 1

According to the requirements of the 4.8 kbit/s DDN services, configure the service transmission as follows:

  • The DDN services occupy the first VC-12 timeslot in the VC-4 (VC4-1:VC12-1) on the SDH link between NE1 and NE2 during the transmission on the SDH network side.
  • The DDN services occupy the SDH_TU-65 channel during the transmission on the PDH interface side.
  • The clock traces the local 2M system clock, with the switching time being 10s.
Table 2-75  Sub-rate encapsulation mode
Parameter NE1 NE2
Subrate Encaptype V.110 V.110
Table 2-76  serial port parameters
Parameter NE1 NE2
Board 7-DXM 7-DXM
Port DDN19 DDN19
Loopback Mode Non-Loopback Non-Loopback
Protocol Mode V.24 Mode V.24 Mode
Serial Port Rate 4.8K(V.110 8K) 4.8K(V.110 8K)
Working Mode DCE DCE
Serial Port Clock Internal Mode Internal Mode
Clock Sampling Mode Triggered by Rising Edge Triggered by Rising Edge
Table 2-77  8 kbit/s service parameters
Parameter NE1 NE2
Board 7-DXM 7-DXM
Source E1 DDN19 DDN19
Source Timeslot Range(e.g.1) 1 1
Source Bit(e.g.1,3-6) 1 1
Sink E1 2M-1 2M-1
Sink Timeslot Range(e.g. 1) 1 1
Sink Bit(e.g.1,3-6) 1 1
Bandwidth 1 1

Configuration Process

This section describes how to configure Nx8 kbit/s services.


Creating the Network has been completed.

You are familiar with Signal Flow and Timeslot Allocation.


  1. Configure a DDN service on NE1.
    1. On NE1, configure the sub-rate encapsulation mode.

    2. Set the serial port attributes for the DDN access port.

    3. Configure PDH port attributes.

    4. Set the attributes of the DDN clock source.

    5. Configure the 8 kbit/s services.

    6. Configure the cross-connections between the Nx8 kbit/s services and the SDH link.

  2. Configure the DDN service on NE2.

    Refer to 1 and configure the DDN data service on NE2.

  3. Enable the performance monitoring function for the NEs by following instructions in Enabling NE Performance Monitoring.
  4. Back up the configuration data of the NEs by following instructions in Backing Up the NE Configuration Data to the SCC Board.
Updated: 2019-01-21

Document ID: EDOC1100020976

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