Nortel RLC Installation And Administration Manual page 51

June 2005
Dynamic trunk bandwidth allocation
In PSTN mode, the RLC dynamically allocates available trunk bandwidth to
maximize bandwidth use. That is, as the RLC initiates calls and bandwidth
requirements increase, the RLC establishes additional trunk connections for
Remote Gateway 9150 units.
Call on-demand
The RLC supports full call on-demand (COD) functionality. This includes
minimum call duration and idle timers that you can configure according to your
service provider's fee structure. COD refers to the way that the RLC handles
host trunk connections. In the COD mode of operation, the RLC does not
establish a host connection until the user places a call to a host DN. The COD
connection stays active until the minimum call duration timer expires. The RLC
then closes the host connection, if idle. If another user initiates a call to the host
before the timer expires, the RLC resets the timer to track the last call
established. There is a single timer for each Remote Gateway 9150 or 911x unit.
Timers
The RLC has two timers to help manage PSTN costs.
Minimum call duration timer
Most PSTN tariffs specify the minimum length of time that providers can
charge users for opening a connection, regardless of the call duration. This
length of time determines the minimum call charges listed on long-distance
telephone bills.
Remote Gateway 9110, 9115, and 9150 units use the minimum call
duration timer in PSTN mode only. This timer specifies the minimum
length of time that each PSTN call to the host PBX remains open,
regardless of telephone activity. You can configure the timer on the RLC to
drop the connection just before the beginning of the next charge period,
when the cost of the call increases. (Refer to Example 1 on page 26.)
Idle timer
Remote Gateway 9110, 9115, and 9150 units also use the idle timer in
PSTN mode only. This timer identifies the maximum length of time a
PSTN connection must remain idle before the RLC closes the connection.
RLC Installation and Administration Guide
RLC description
25