SDH has a byte set aside for a 64Kbps voice channel in the header (byte E2) with the title MS orderwire byte.
Why? What is this for?
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An express orderwire is a dedicated voice channel between two points, the TIA define it here. In SDH Transport terms it is a dedicated byte per header that effectively gives a 64Kbps channel between two points. Transport engineers think a lot differently to LAN/WAN people in this respect, Ethernet has no such concept, nor does ATM to my knowledge. I know this concept exists for electricity-related systems though. Anyone with any more information? Is the byte used on every SDH header? Even for STM-256s? (Isn't that more than 64Kbps?) |
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