Voice Switch Requirements Chapter 13: Site Requirements and Preparation
13.3.5 Reliability and Availability
Each ShoreGear voice switch is an embedded product with no moving parts other than a
highly reliable fan. In addition, the power supply contained within the voice switch has a
very high individual mean time before failure (MTBF), as shown in Table 13-9.
Since the ShoreTel 8 system is plug-and-play, a switch can be replaced in minutes.
Distributed call control software means there is no system-wide single point of failure. If a
single ShoreGear voice switch fails, all the other voice switches continue to operate.
Table 13-10 shows the reliability information for the ShorePhone phones. Hourly numbers
shown are based on demonstrated reliability (as opposed to calculated).
13.3.6 Memory and Processing
Each ShoreGear voice switch has the same memory and processing (see table below).
Operating temperature 0° to 50° C (32° to 122° F)
Operating humidity (non-condensing) 10% to 90%
Storage temperature –30° C to 70° C (-34.4° to 158° F)
Table 13-8 ShoreGear Environmental Specifications
MTBF (hours) MTTR (hours) Availability
ShoreGear 120 84,570 320,142 1 99.9997%
ShoreGear 60 90,956 152,388 1 99.9993%
ShoreGear 40 132,302 314,557 1 99.9997%
ShoreGear T1 158,229 312,709 1 99.9997%
ShoreGear E1 154,229 312,709 1 99.9997%
MTBF = Mean time before failure
MTTR - Mean time to repair
Availability = %uptime/time = MTBF/(MTBF+MTTR)
Table 13-9 ShoreGear Voice Switch Dependability
Phone MTBF hours (calculated) MTBF hours (demonstrated)
IP110 64,800 490,000
IP115 N/A TBD
IP210 62,100 240,000
IP212k 58,200 350,000
IP230 58,200 350,000
IP265 N/A TBD
IP530/560 56,300 360,000
IP560g 56,400 TBD
IP565g N/A TBD
BB24 72,600 TBD
Table 13-10 ShorePhone IP Phone Dependability