Product Guide - A5000 R5.4 – Aastra X series
BPS0121AENAA01 Page 7/74
Remote management can be performed through:
• ISDN, thanks to the integrated HSCX component
• IP, in secured HTTPS administration through Aastra Management Portal. This interface,
therefore, replaces the VT100 and allows remote access to the configuration’s services,
through a simple web browser.
5.1.2.5 High availability of Aastra XD
Reliability and availability:
A distinction must be made between system reliability and availability:
• Reliability is defined as the Mean Time Between Failures (MTBF).
• Availability is defined as the Mean Time To Repair (MTTR).
High availability of the AXD:
Availability of telephony services may be affected by the following elements:
• Hardware: lighting, CPU problems (capacitor failure, microprocessor failure, etc.), ageing of a
component
• Software: bugs
• External links: operator/PSTN carrier link disruptions, IP network (LAN, WAN) failure
• Network reliability: problem of voice quality, viruses, hackers
• Environment: battery, humidity, heat
• Human errors
AXD offers a high level of availability rate of 99.999% in duplex mode.
The table below shows, for each element that affects availability, the solutions brought in by AXD in
duplex mode in order to provide high availability to both traditional subscribers and IP subscribers.
Type of element Availability for traditional subscribers Additional availability for IP
subscribers
Hardware
Duplication of the motherboard
Logbook, traces
External links
Operator access load-balancing
(ISDN, analogue and SIP)
Duplicated IP access point
Network reliability In case of IP network failure, the
traditional and DECT terminals will
continue working
Dual homing for digital phones
Dedicated real-time call processing,
Firewall compatibility
Environment
Duplication of power supply and
battery
Human errors Certification and procedures, training
This duplex mode operation is optional; AXD can also work in simplex mode. In this case, none of its
elements is duplicated, except for the fans of the power supply.
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