Page 30 of 378 Description
553-3001-202 Standard 1.00 April 2000
Active Leader
The Active Leader card is an ITG ISL Trunk card that acts as a point of
contact for all other Meridian 1 in the network.
The Active Leader card is responsible for the following:
• distribute incoming H.323 calls to each registered Follower card in its
node, and balance load among the registered cards for incoming IP calls
• IP addresses for other cards in its node
• work as a time server for all ITG ISL Trunk ca rds in its node
• perform network monitoring for outgoing calls in its node
• vo ice processing
All calls from a remote Meridian 1 ITG node are pre se n ted to the Active
Leader card. The Leader car d m ai n ta in s a resource table of all the I TG ISL
Trunk cards in its node. The Active Leader card consult s its in ternal Foll ower
card resource tab le to determine w hich Follower car d has the most i dle
channels. The Active Leader card selects this ca rd to receive the new call. Th e
Active Leader sends a message to the selected Follower card, informing it to
reserve a channel for t he new call. It redir ects th e call to the selected Follower.
The Follower card performs dialed number to IP address translation.
Backup Leader
The Backup Leader card steps in when the Leader is out-of-service. This
minimizes service interruptions.
D-channel IP
g
atewa
y
(DCHIP)
The ITG ISL Trunk card with DCHIP functionality (DCHIP Card) is
connected by the RS-422 cable to the Multi-purpose Serial Data Link
(MSDL) card on the Meridian 1 large systems. It connects to the SDI/DCH
Card on small systems. The DCHIP Card is equipped with a DCH PC Card.
The DCH PC Card provides the RS-422 and LAPD functionality that is
required for the D-channel (DCH) interface to the Meridian 1. The DCHIP
Card is the network side of the Meridian 1 ISL D-channel connection. The
card is a tandem node in the swit ch network, providi ng a single- to multi- point
interface between the Meridian 1 and the IP network (see Figure2).