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OSN 500 550 580 V100R008C50 Commissioning and Configuration Guide 02

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Configuring an Asynchronous Sub-rate Transparent Transmission Service (RS422 Port)

Configuring an Asynchronous Sub-rate Transparent Transmission Service (RS422 Port)

Some remote terminal units (RTUs) in the electric power industry can be controlled and managed at remote sites but cannot be remotely managed in the control center in a centralized manner. To resolve this issue, deploy the supervisory control and data acquisition (SCADA) system in the control center and configure point-to-point RS422 serial port services on the transmission devices between the control center and sites to enable the control center to remotely manage RTUs.

Network Diagram

This section describes the networking of NEs.

The OptiX OSN 550 and 580 support asynchronous sub-rate transparent transmission services. This solution can transmit sub-rate services at a rate of 0 kbit/s to (device port rate/5) kbit/s. When the transmission distance is longer than 15 m and shorter than 1000 m, the port protocol mode can be set to RS422 and RS232-to-RS422 converters can be added to the transmission path to extend the transmission distance.
NOTE:
If the device port rate is set to N*64k (N = 1), this solution supports a rate range of 0 kbit/s to 12.8 kbit/s (1 x 64 kbit/s/5 = 12.8 kbit/s).
Figure 2-28 shows the network diagram for asynchronous sub-rate transparent transmission services (RS422 port). The service requirements on the network are planned as follows:
  • Asynchronous sub-rate services at a rate of 0 kbit/s to 12.8 kbit/s are transparently transmitted between NEs.
  • The distance between the RTU and an NE is 100 m, and the distance between the SCADA and an NE is also 100 m.
  • The RTU and SCADA receive asynchronous sub-rate services through DXM boards in slots 7.
  • Services are transmitted between NE1 and NE2 through SDH cross-connections.
Figure 2-28  Network diagram for asynchronous sub-rate transparent transmission services (RS422 port)
NOTE:

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.

Service Planning

This section describes the parameters required for configuring asynchronous sub-rate transparent transmission services (RS422 port).

Each of NE 1 and NE 2 requires a 64 kbit/s service channel. Table 2-28 provides the timeslot allocation of a 64 kbit/s service channel.

Table 2-28  Timeslot allocation of a 64 kbit/s service channel
NE Board Source E1 Source Timeslot Range Sink E1 Sink Timeslot Range
NE1 7-DXM DDN-13 1 2M-1(SDH_TU-65) 1
NE2 7-DXM DDN-13 1 2M-1(SDH_TU-65) 1
  • The sub-rate services occupy the SDH_TU-65 channel during the transmission at the PCM port side.
  • The sub-rate services occupy the first VC-12 timeslot in the first VC-4 (VC4-1:VC12-1) on the SDH link between NE 1 and NE 2 during the transmission at the SDH network side.
Table 2-29  Parameters for serial port management
Parameter NE1 NE2
Board 7-DXM 7-DXM
Port 7-DXM-13(DDN-13) 7-DXM-13(DDN-13)
Serial Port Rate N*64K N*64K
N Value 1 1
Protocol Mode RS422-Trans Mode RS422-Trans Mode
Working Mode DCE DCE
Phase Mode Normal phase Normal phase
Synchronous Yes Yes
Other parameters Default values Default values
Table 2-30  64 kbit/s service parameters
Parameter NE1 NE2
Board 7-DXM 7-DXM
Direction Bidirectional Bidirectional
Source E1 DDN-13 DDN-13
Source Timeslot Range (e.g. 1, 3-6) 1 1
Sink E1 2M-1(SDH_TU-65) 2M-1(SDH_TU-65)
Sink Timeslot Range (e.g. 1, 3-6) 1 1
Bandwidth 1 1
Table 2-31  SDH service parameters
Parameter NE1 NE2
Level VC12 VC12
Direction Bidirectional Bidirectional
Source Slot 7-DXM 7-DXM
Source VC4 - -
Source Timeslot Range (e.g. 1, 3-6) 65 65
Sink Slot 4-SL41O-1(SDH-1) 4-SL41O-1(SDH-1)
Sink VC4 VC4-1 VC4-1
Sink Timeslot Range (e.g. 1, 3-6) 1 1

Configuration Procedure

This section describes the procedure for configuring an asynchronous sub-rate transparent transmission (through an RS422 port) services.

Prerequisites

Procedure

  1. Configure a pulse code modulation (PCM) service on NE1.
    1. Configure the port for receiving and transmitting a PCM service.



      Click Apply.

      NOTE:

      In this example, retain the default values for the other parameters in the Serial Port Management window. Plan the parameters according to the actual networking. For details about the parameters, see Parameters for Serial Port Management.

      When the protocol modes of ports DDN13 to DDN15 are set to RS422 Mode or RS422-Trans Mode, ports in pairs (ports DDN13 and DDN16, ports DDN14 and DDN17, or ports DDN15 and DDN18) cannot be occupied by other services.

    2. Configure a 64 kbit/s service.



    3. Configure the cross-connection between the PCM service and an SDH link.

  2. Configure a PCM service on NE 2.

    Follow instructions in 1 to configure a PCM service on NE 2.

  3. Check whether the service is correctly configured by following instructions in Testing Sub-Rate Services.
  4. Enable the performance monitoring function for the NEs by following instructions in Enabling NE Performance Monitoring.
  5. Back up the configuration data of the NEs by following instructions in Backing Up the NE Configuration Data to the SCC Board.
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Updated: 2019-01-21

Document ID: EDOC1100020976

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