Keri Systems LAN-520 - Manual (Page 10)

LAN-520 AESP
Installation Guide
Page 10 of 13 P/N: 01519-001 Rev. B
- If telnet is unable to connect, then review the settings. If the settings are correct then contact a network
administrator to verify the needed ports are available. Some operating systems and hardware, such as routers and
firewalls are set to block ports. Ensure these firewalls have ports 10001, 10021, and 9999, open for communication
with the Doors32 or Doors.NET software.
NOTE: If you are able to telnet into port 9999 in the command prompt but not to 10001, it is very likely that the ports
required by Doors are blocked and will require that a Network Administrator address the issue so a successful telnet
session to port 10001 may take place.
4.5.3 Enabling the Telnet Client in Windows 7
The Telnet Client is disabled by default on a Windows 7 operating system. If you try to make a Telnet connection to the
LAN-520 but you see the following message: 'telnet is not recognised as an internal or external command, operable
program or batch file' then you will need to enable Telnet. Perform the following steps to enable Telnet in Windows 7:
1. From the start menu go to Control Panel >> Programs and Features.
2. On the left of the program list click Turn Windows Features on or off.
3. From the Windows features list locate Telnet Client.
4. Place a tick against Telnet Client.
4.6 Calculating Netmask: Number of Bits For Host Part
During the configuration of the LAN-520 AESP's TCP/IP address it will be necessary to add the subnet mask in number
of host bits. The following is one way of calculating the host bits in a subnet.
A Decimal to Binary conversion of 255 will be all 1’s (11111111) and a 0 will equal 8 0’s (00000000).
If there are two 0’s in the subnet (255.255.0.0) there will be 16 0’s thus the host part will be 16.
1. To calculate a subnet like 255.255.255.248, open the Windows Calculator.
2. Click on View > Scientific.
3. Dec (Decimal) will already be selected.