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DEFINITY Made Easy Tools
Issue 2, November 2000
DEFINITY Hardware
TN792
In high- and critical-reliability R7 or later si systems, duplication interfaces copy the contents of memory from the primary Switch Processing Element (SPE) to a standby SPE, so that the latter can take over immediately when the former fails. The TN792 uses the Enhanced M-Bus of the TN2404 (R9) or TN790B (R7 and R8) processor for this memory shadowing function. The Enhanced M-bus supports 32-bit addressing and data access (vs. 16-bit for the M-bus), so it transfers data faster and shadows a larger area of memory than the older bus. The M-bus is still supported, however, for legacy applications. The TN2404 is required for R9si duplicated systems. The TN790B is required for all R7 and R8 si duplicated systems.
You need two TN792 circuit packs, one for the primary control carrier and one for the standby. You can replace TN772 duplication interfaces with TN792s, but you must replace them in pairs. A TN772 cannot communicate with a TN792.
A new duplex optical cable connects the TN792 circuit packs. This cable eliminates the additional electromagnetic emissions that would otherwise result from the doubled data rate on the bus. The optical cable interface to the new DUPINT is on the front faceplate of the circuit pack.
The TN792 is compatible with existing duplication cables.
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| Copyright� 2000 Avaya Inc |
| Send comments to MadeEasy Development Team |
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