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CLAN-BD (Control LAN Circuit Pack)
Issue 1 June 2005 789
CLAN-BD (Control LAN Circuit Pack)
S8700 | 8710 / S8500
Control LAN circuit pack
The TN799 Control LAN (C-LAN) packet port circuit pack provides TCP/IP connection to
adjunct applications such as CMS, INTUITY, and DCS Networking. The C-LAN circuit pack has
one 10baseT Ethernet connection and up to 16 DS0 physical interfaces for PPP connections.
C-LAN also extends ISDN capabilities to csi models by providing packet-bus access.
An RSCL (remote socket control link) links the C-LAN and the server to pass call- control and
other management information. Because one link serves every port on the circuit pack,
maintenance of the RSCL is part of the C-LAN circuit-pack maintenance.
The TN799 C-LAN circuit pack combines the functions of the PGATE and PI circuit packs into
one circuit pack. Use a PGATE or PI with a C-LAN to create an X.25-to-TCP/IP bridge for
adjunct and DCS connectivity.
C-LAN socket load balancing
Prior to Communication Manager Release 2.0, IP endpoints registered to C-LANs (TN799x) on
a round-robin algorithm, where an IP endpoint registers to the next available C-LAN within a list
of available C-LANs. In a system with two or more C-LANs, this distribution method can result in
one C-LAN controlling the majority of IP endpoints. This skewed distribution of endpoints among
available C-LANs results in a vulnerability to a higher loss of telephony resources in the event of
a C-LAN failure than if the IP endpoints were more uniformly distributed across the available
C-LANs.
With Communication Manager Release 2.0, a new feature provides for a more uniform
balancing of the load across the available C-LANs. With this feature, an IP endpoint registers to
the C-LAN with the least number of used sockets (regardless of the number of available
sockets). This will apply to the following IP endpoints:
● H.245, H.248, and H.323 signaling groups
● H.323 stations
● SIP endpoints
MO Name in
Alarm Log
Alarm
Level
Initial Command to Run Full Name of MO
CLAN-BD MIN test board location long Control LAN circuit pack
CLAN-BD WRN test board location short Control LAN circuit pack