What's Order-Wire Function ?

Hello Everyone 

  I'd like to share with you What's Order-Wire Function ? in below points 

1- What is the Order-wire concepts?

2-  What about Function of E1 and E2 Bytes?

3- Classification of Order-Wire

4- Ref. of my article 

What is the Order-wire concepts?

The Order – Wire is the Voice Communication facility provided among nodes in SDH Networks

What about Function of E1 and E2 Bytes?

The E1 byte is used as a Voice Channel among the regenerators and Multiplexers

The E2 byte is used as Voice Channel between Multiplexers

Classification of Order-Wire

1- Addressing Call: the addressing call is consisting of sub-network number Plus Subscriber number.

A)      The Sub-network number depends on Network Topology whether rings or chains

B)     The Subscriber number is consisting of Node ID Plus Phone Number  

2- Conference Call: The Conference Call gives a point to multi point voice Communication channel from node into other nodes.When we dial conference call number, the 1^st phone of all nodes will ring and below is example where the Conference Call is set 9s for all 

3- Order-Wire Telephone and it is divided to

a) Hotline Telephone: When you pick up the hotline telephone, the pre-specified number in the hotline will be automatically dialed.

b) Special Line Telephone: a Communication Channel is established between two phones automatically and two phones are picked up at the same time without dialing or ring back tone.

Reference is: SDH Networking Topic 

Warm Regrads,

Walid Nawar - PDAC - MVE