Bell South utilises GarrettCom NEBS certified Ethernet switches for database system

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As Bell Souths number of subscribers and their wireless call volume has grown, the need for increased capacity and redundancy in the HLR private WAN has grown also. Historically, a 16-port 10/100 Ethernet hub had been sufficient at each HLR centre. However, the need for multiple 8-port Ethernet switches at each site to break the HLR LAN into multiple redundant pieces was now required. The newly specified switches needed to operate from redundant 48VDC power sources, and have NEBS certification. This was necessary because they were to be installed for mission-critical applications and could not risk the chance of hardware failure.

Bell South selected 4K8R Ethernet switches for the HLR LAN facilities because each is configured with a dual-source 48VDC power supply, and could be reverse mounted in 23 Telco racks. By having the Reverse model, that specific feature placed the connectors in the rear and the LEDs in front for a clean installation and convenient monitoring of status information, which in normal use is more convenient and logical for viewing. The high reliability (over 100k hours MTBF), low emissions (Class B) and NEBS certification more than fulfilled the stringent CO requirements and helped ensure the uptime of such services. With multiple 4K8s configured in a redundant HLR LAN at each location, increased reliability and greater interconnect bandwidth were achieved.

Download application note: Bell South utilises GarrettCom NEBS certified Ethernet switches for database system [PDF]