Required CPAN Modules for Mon

#perl -MCPAN -e shell
cpan>install Time::Period
cpan>install Time::HiRes
cpan>install Convert::BER
cpan>install Mon::Protocol
cpan>install Mon::SNMP
cpan>install Mon::Client

And, depending upon what you want to monitor, you may also wish to install the following optional modules:
cpan>install Filesys::DiskSpace
cpan>install Net::Telnet
cpan>install Net::LDAPapi
cpan>install Net::DNS
cpan>install SNMP

Null Modem for High Availability

Null modem cable pin mapping
This is one very common mapping which will work with software that relies on proper assertion of the CD signal.

Signal Name	DB-25 Pin	DE-9 Pin		DE-9 Pin	DB-25 Pin
FG (Frame Ground)	1	-	X	-	1	FG
TD (Transmit Data)	2	3	-	2	3	RD
RD (Receive Data)	3	2	-	3	2	TD
RTS (Request To Send)	4	7	-	8	5	CTS
CTS (Clear To Send)	5	8	-	7	4	RTS
SG (Signal Ground)	7	5	-	5	7	SG
DSR (Data Set Ready)	6	6	-	4	20	DTR
CD (Carrier Detect)	8	1	-	4	20	DTR
DTR (Data Terminal Ready)	20	4	-	1	8	CD
DTR (Data Terminal Ready)	20	4	-	6	6	DSR

#Use 1-4 & 4-1 for 9 pin HA null modem.