X25AM Programming Manual

Introduction
X25AM Programming Manual—527201-001
1-4
Port Numbers and Subaddressing
On X.25 links there can be more than one port number associated with each DTE
address. Figure 1-3 shows multiple ports for one DTE address.
Each port can have multiple subdevices associated with it, as Figure 1-4 on page 1-5
illustrates.
Figure 1-2. DTE Address, Port Number, and Called Address
Figure 1-3. DTE Address, Multiple Port Numbers, and Called Addresses
DTE Address: 12345678
Port Number: 99
Called Addreses: DTE addess plus port number.
1234567899
DTE #12345678--PORT #99--Subdevice A
VST0102.vsd
DTE
#12345678
PORT
#88
PORT
#99
Subdevice A
Subdevice B
DTE Address: 12345678
Port Number: 99
Port Number: 88
Called 1234567899
Addreses: 1234567888
VST0103.vsd