Specifications

DMS-100 ringing overview 1-39
DMS-100 Family DMS-100 Ringing System BASE15 and up
Provisioning ringing generators
This section describes considerations that must be given to ringing when
provisioning DMS-100 lines peripherals. You can find guidelines for
provisioning lines peripheral modules by referring to the Provisioning
Manual.
When assigning lines to line peripherals, pay close attention to the number and
type of lines assigned to each peripheral to prevent ringing generator overload
conditions.
Although Table 1-4, "Summary of ringing in peripheral modules" on page
1-32 states the maximum number of lines each ringing generator can ring
simultaneously, the actual value will vary depending on the characteristics of
the line. Specifically, the typical line impedance (consisting of loop resistance,
capacitance, and inductance), the number of ringers on the line, and the type
of ringers on the line affect the number of lines a ringing generator can ring.
When assigning lines to peripheral modules (PM), in addition to the
considerations listed in Provisioning Manual you must consider the typical
loop length and the number of ringers per line in your office when using traffic
study data for provisioning peripherals. Determine the maximum number of
lines you expect to be rung simultaneously at any given time and compare to
the maximum number of lines stated in the Table 1-4, "Summary of ringing in
peripheral modules." which are based on three ringers per line and a short loop
length.
If it appears the ringing generator may be overloaded, you should consider
redistributing the load to other PMs to prevent the possibility of call blocking
due to ringing generator overload.
Ringer configurations
The following ringer configurations are used with the DMS-100 switch:
• bridged
• tip
• ring
Each of these configurations is illustrated in the following figure.