Demand test descriptions and error codes - Avaya Support

Figure 55: Distributed PKT-INTs
IPSI IPSI
PKT
EI
PN 1
S8700-series Fiber-PNC
PKT-INT Interchange
pkt
BRI/PRI
EI
Server A Server B
PCD
Control Network A Control Network B
IPSI IPSI
PKT pkt
PN 2 PN 3
Bearer Network A Bearer Network B
Legend:
PKT-INT (Packet Interface)
PKT-INT interchange is independent of server interchange, and a PKT-INT interchange can
occur without a server interchange and vice versa. The active server’s packet control driver
(PCD) has sockets to both active and standby IPSIs and exchanges heartbeats with both. The
active PCD is responsible for bringing up the active PKT-INT, and for bringing up the standby
PKT-INT into the standby mode. The standby PCD also has sockets to both active and standby
IPSIs and exchanges heartbeats with both. The standby PCD only talks to the IPSI SIM, and
does not communicate with the PKT-INTs. The active server communicates directly with both
active and standby PKT-INTs and performs maintenance activities on both PKT-INTs without the
standby server getting involved.
There is no dedicated hardware to keep the standby PKT-INT up-to-date. Instead, the PCD
refreshes the standby PKT-INT prior to an interchange.
PN 4
BRI/PRI BRI/PRI BRI/PRI
EI EI EI EI EI EI
PCD connection
Local LAPD
Inter-PN LAPD
Inter-PN LAPD
PKT Active PKT-INT
pkt Standby PKT-INT
Issue 5 May 2009 725