User's Manual

Conclusion 93

Conclusion

Careful planning and testing is required. Nortel recommends you simulate

every configured scenario, and analyze in detail the possible impact of

every scenario. An off-site testing procedure in a lab environment is

usually appropriate, to prevent loss of alarms (during change in image,

eKERNEL and other modules are stopped and all alarms can be lost).

Also, take into account that having a high-availability solution in

place affects change management. Changes applied to eKERNEL

must be synchronized, and (automatic) database upgrade changes

to Messenger_CFG.MDB must be handled manually by the system

administrator.

Finally, note that configuration changes with eCONFIG, eGRID, eWEB, or

another configuration tool can affect the total environment. For example,

a divert to another device does not work in a backup environment if

the destination device in not available, or the module is unavailable.

Therefore, due to the nature of such an architecture, and maintenance

issues and customer specific factors that are beyond our control, the

authors of eTH_HA cannot accept responsibility for malfunction of the

software.

Nortel Communication Server 1000

DECT Messenger Installation and Commissioning — Book 2

NN43120-301 02.01 4 June 2010