Verilink 9000 Series (34-00271) Product Manual - Manual (Page 262)

240 C HAPTER 13: X.25
The second situation (see Figure 13-7) is when two devices with the same address
generate internal connect requests to the X.25 port. Normally, the MultiPro unit
places a call request on behalf of the first station and refuses the internal connect
request from the second device. If pooling is turned on, though, the MultiPro unit
searches through the channel list for an entry with the same subaddress. If a match
is found and that entry is not connected, the MultiPro unit places a call request for
the second station.
This option is handy for remote sites that have duplicate station addresses on
separate terminal ports with different default hosts that need to use a common
transport path to reach their destinations.
DOWNLOAD CONFIG
MODE BACKUP NET ALARM POWER
PRISM 9111 T R A N S P O R T
®
Processor
DOWNLOAD CONFIG
MODE BACKUP NET ALARM POWER
PRISM 9111 T R A N S P O R T
®
X.25
Terminal 01
Default host = HOSTA
Terminal 01
Default host = HOSTB
Unit 001 Unit 002
Call Request: sub-addr = 001
Internal connect request
addr = 01 dest. = HOSTA
Internal connect request
addr = 01 dest. = HOSTB
Call req. sub-addr. = 001
dest. = HOSTA / addr. = 01
Call req. sub-addr. = 001
dest. = HOSTB / addr. = 01
Unit 001
Channel List
Addr Sub-addr
01
02
03
01
001
002
003
001
Call Request: sub-addr = 001
HOSTA
HOSTB
Figure 13-17 Typical Application with the Address Pooling Option - Scenario 2