How to Plan Orderwire Phone Interfaces on Huawei Optix OSN2500?

Capability of Supporting Orderwire Phone Interfaces

The capability of supporting orderwire phone interfaces is defined.
The Q1SEI board of the Huawei OptiX OSN 2500 provides one orderwire phone interface, two NNI
voice interfaces and two NNI signaling interfaces. The five interfaces are all of the RJ-45 type.

Planning Principles

The principles for planning the orderwire phone interfaces are defined.
Adhere to the following principles when planning orderwire phone interfaces:

• Make sure that the orderwire signaling is compatible in the entire network.
• Make sure the orderwire phone number of each node is of the same length. It is recommended that the orderwire phone number be set as four characters.
• Set the orderwire phone number in the format: subnet number (one character) + user number (three characters).
• Make sure that the conference phone numbers in the entire network are the same and the number should be larger than the orderwire phone number. It is recommended that the conference phone number be set to 9999.
• Make sure that all orderwire phone numbers in the entire network, except the conference phone number, are unique.
• Make sure that the dial-up scheme of the orderwire phone of each node is dual-tone multifrequency.
• Make sure the call waiting time of each node is the same. If less than 30 nodes are present in the network, set the call waiting time to 5s. If more than 30 nodes are present in the network, set the call waiting time to 9s.
• The orderwire phone number should increase as the node ID increases.
• Consider the possibility of howl in the orderwire loop. Release the loop to solve the problem of howl in the conference phone. The loop is automatically released, if an OptiX OSN 2500 system is networked with other OptiX OSN 2500 systems, or with Huawei OptiX OSN 7500, OptiX OSN 3500, OptiX OSN 3500T, OptiX OSN 2500REG and the OptiX OSN 1500. If the OptiX OSN 2500 is networked with other equipment, manually release the loop.
• If no optical path is available between two nodes, which, however, require orderwire communication, use the orderwire NNI connection for the orderwire communication. Use Voice 1 or Voice 2 as the voice interface, and Serial 3 or Serial 4 as the data interface for the orderwire NNI connection.

Planning Example

An example is given to show how to plan the orderwire phone interfaces.

Set the orderwire phone number as four characters, with the last two characters being the same

as the node ID. The conference phone number has four characters and is 9999.