Site Requirements and Preparation
Planning and Installation Guide
13 – 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 13-5.
Since the ShoreTel 6.1 system is plug-and-play, a voice switch can be replaced in a few
minutes.
Thanks to the distributed call control software of the ShoreTel 6.1 system, 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 13-6 shows the reliability information for the ShorePhone phones.
Table 13-5 ShoreGear Voice Switch Dependability
Voice Switch
Predicted
MTBF (hours)
Demonstrated
MTBF (hours) MTTR (hours) Availability
ShoreGear-120/24
84,570
320,142
1
99.999
ShoreGear-60/12
90,956
152,388
1
99.999
ShoreGear-40/8
132,302
314,557
1
99.999
ShoreGear-T1
158,229
312,709
1
99.999
ShoreGear-E1
154,229
312,709
1
99.999%
MTBF = Mean time before failure
MTTR - Mean time before repair
Availability - % uptime/time = (MTBF - MTTR)/MTBF %
Table 13-6 ShorePhone IP Phone Dependability
Phone
MTBF (hours)
IP530/560
300,000
IP210
325,000
BB24
TBD
IP110
TBD
IP212k
TBD
IP230
TBD
IP560g
TBD
