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Deploying SpectraLink 8020/8030
Wireless Telephones
May 2009 Best Practices Guide
the AP coverage supports 12 simultaneous calls per AP, each AP can then support approximately 39
moderate users. This allows some users to be in-call and others in standby.
The Table 2 shows maximum users per AP based on the AP’s ability to handle simultaneous calls:
User Calling Intensity Light Moderate Heavy
Erlangs per User 0.10 0.15 0.20
Max Active Calls per
AP
Users Supported per AP
(1% Blocking Probability)
1 1 1 1
2 2 2 2
3 4 3 3
4 8 6 4
5 13 9 7
6 19 13 10
7 25 17 13
8 31 21 16
9 37 25 19
10 44 30 22
11 51 34 26
12 58 39 29
Table 2 - Users Supported per Access Point
Areas where heavier wireless telephone usage is expected, such as cafeterias, staff lounges, and
auditoriums, can obtain higher call capacity and handle more users by installing additional APs. For most
enterprise applications however, the table above should be sufficient in demonstrating the number of
wireless handsets supported within each AP’s coverage area.
2.3.4 Telephony Gateway Capacity
Telephone system administrators should consider the user distribution on SpectraLink 8000 Telephony
Gateways much in the same way as they do PBX line cards. Telephony Gateways incorporate a physical
connection to a PBX line card. The phone system administrator should spread departments or functional
areas across multiple PBX line cards and across multiple Telephony Gateways so that a failure of either
component does not cause a complete wireless handset outage in one department or area. In addition,
system administrators must consider that one Telephony Gateway can support a maximum of eight
handsets in an active call state. While the Telephony Gateway can manage 16 wireless telephones total
only eight can be in call at any one time. Therefore, heavy users should be spread across Telephony
Gateways to reduce the chance of call blocking.
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