MSTP Equipment

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For the OptiX OSN 7500 II, the procedure for configuring orderwire phones is slightly different from that for configuring orderwire phones for other MSTP equipment.

The procedure is as follows:

1. For an OptiX OSN 7500 II device, in the NE Explorer, select an N3DX1 board and choose ConfigurationPort Management from the Function Tree. Click the Port Type Configurations tab and set the DDN-30 port type to EOW.


2. In the NE Explorer, select a NE and choose Configuration > Orderwire from the Function Tree. Click the General tab.


3. Click Query to query information from the NE.

4.Set Call Waiting Time(s), Telephone No. and orderwire ports.

 NOTE:

Call Waiting Time should be set to the same value for all NEs with orderwire communication. When the number of NEs is smaller than 30, set the value to 5 seconds. Otherwise, set it to 9 seconds.

5.Click Apply. A prompt appears telling you that the operation was successful.

6. Click Close.

i want to know what orderwire phone exactly is ? why do we need it ? why do we configure it ? What is the purpose of it ?

Orderwire

OptiX RTN 910A/950/950A/980 supports orderwire phones so that operation or maintenance engineers at different workstations can perform voice communication through microwave or SDH overhead bytes.

When using an orderwire phone, note the following points:

The orderwire phone numbers of all nodes on the network must be of the same length. A 3-digit number is recommended and all orderwire phone numbers on the entire network must be unique.
Dual tone multiple frequency is used as the dialing method of the orderwire phone on each node.
The call waiting time must be set to the same value for all nodes. It is recommended that you set the call waiting time to 5s if fewer than 30 nodes exist on the orderwire subnet and to 9s if more than 30 nodes exist on the orderwire subnet.
The product supports the orderwire group call function. When the orderwire group call number "888" is dialed on an RTN device, orderwire phones of all RTN devices on the orderwire subnet ring. When an orderwire phone receives the call, orderwire phones on other NEs stop ringing. In this case, the orderwire group call changes to a point-to-point common orderwire call.

When orderwire signals are transmitted over a microwave link, they are always transmitted through one customized overhead byte. When orderwire signals are transmitted over SDH fibers, they are transmitted through the E1 or E2 byte.
By default, all line ports, IF ports, and unconfigured synchronous data ports on an OptiX RTN device function as orderwire ports. Therefore, in normal cases, orderwire ports need to be configured only at the edge of an orderwire subnet.
The equipment supports the transmission of orderwire overhead bytes through a 64 kbit/s synchronous data port or an external clock port. If two pieces of equipment are connected in back-to-back mode, they do not support the orderwire group call function (orderwire group call number "888").
If multiple microwave links or optical transmission lines exist between two NEs, ports corresponding to these links must be configured as orderwire ports. When Hybrid microwave links are not used in N+1 protection, orderwire signals can be normally transmitted between two NEs as long as one of microwave links between the two NEs is available. When orderwire signals are transmitted over Hybrid microwave links in N+1 protection, the protection link cannot transmit orderwire signals.


You may also like this post - https://forum.huawei.com/enterprise/en/what-s-order-wire-function/thread/635305-100049

Dear friend！
The orderwire phone is used for inter-site engineers to communicate with each other during deployment and commissioning.
Fixed telephones are used in early communication networks. However, optical transmission equipment is the basic network of the communication network. Only after the optical transmission equipment of a node is commissioned, a communication channel can be provided for the client equipment responsible for processing telephone signals. Therefore, you cannot communicate with remote engineers during the commissioning of transmission network equipment.
Therefore, the engineers who develop and design the optical transmission equipment add the orderwire function to the optical transmission equipment so that the engineers of the optical transmission equipment can communicate with each other in basic languages, thus improving the efficiency of network construction. This feature has been used to this day.
The orderwire is an auxiliary function of the optical transmission equipment. It occupies only a small part of the SDH overhead bytes and is not the main service processed by the equipment. Therefore, the orderwire is integrated on the auxiliary processing board.
Thank you！