Nortel Networks NN43001-504 Wlan IP Telephony Manager 2245 planning, Installation requirements

WLAN IP Telephony Manager 2245 planning 59

industry. So to mitigate risks, you can use a firewall to block all but the ports needed for IP Telephony. This practice becomes complex and costly when multiplied by a number of subnets. A more cost-effective alternative to implementing a firewall is to assign private addresses to the handsets and let the WLAN IP Telephony Manager 2245 network address translation (NAT) capabilities serve as a form of secure firewall to the telephony LAN (T-LAN). Of course this is not as secure as using a traditional firewall to secure the T-LAN.

The downside of putting all telephony devices into the same subnet is that broadcasts are increased. Also, while security is simplified, the importance of implementing adequate security measures increases because more devices will be impacted in the event of a security breach.

WLAN IP Telephony Manager 2245 planning

Both the WLAN IP Telephony Manager 2245 and the WLAN Application Telephony Gateway 2246 are connected to the Ethernet switch.

Installation requirements

The WLAN IP Telephony Manager 2245 requires a CAT5 cable connection between its network port and the Ethernet switch. The WLAN IP Telephony Manager 2245 can auto-negotiate to the type of port on the Ethernet switch. It supports 10BaseT, 100BaseT, full-duplex and half-duplex port types.

Nortel recommends 100BaseT full-duplex.

Note: When multiple WLAN IP Telephony Managers 2245 are used, all the WLAN IP Telephony Managers 2245 must use a uniform media type. Do not use full-duplex on some and half-duplex on others, or 10BaseT on some and 100BaseT on others.

Capacities

The WLAN IP Telephony Manager 2245 is available in three models:

•WLAN IP Telephony Manager 2245-80: Serves 500 powered-on handsets (80 simultaneous calls).

•WLAN IP Telephony Manager 2245-20: Serves 20 powered-on handsets.

•WLAN IP Telephony Manager 2245-10: Serves 10 powered-on handsets.

Capacity is measured by active calls for the WLAN IP Telephony Manager 2245-80 and by powered on handsets for the WLAN IP Telephony Manager 2245-10 and the WLAN IP Telephony Manager 2245-20. The capacity

of a system that is not based on 100Base-T, full-duplex is lower. Nortel recommends that you not use older technology equipment.

Nortel Communication Server 1000

WLAN IP Telephony Installation and Commissioning

NN43001-504 01.02 Standard

Release 5.0 15 June 2007

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