Mitel SX-200 Documentation page 486

11.09 Message Circuit Noise.
within the system does not exceed the following limits:
Line-to-Line
Line-to-Trunk
Trunk-to-Trunk +16 dBrnC (message weighted)
Impulse noise in the voiceband results in zero counts at a threshold
level of 46 dBrnC.
11 .lO System Impedances.
600 ohms nominal for lines
l
l
11.11 Envelope Delay.
tween 400-3200 Hz.
CONSIDERATIONS
General
12.01 This Part provides background data in determining the following
parameters for the PBXs under various traffic loading con-
ditions:
Level of traffic per line (ccs per line), and quantities of receivers
required.
Intercom Traffic
12.02 In determining the Intercom Traffic values and expressing these
values as ccs per line figures, the following assumptions are
made:
Total Traffic (T) is 763 ccs.
l
Originating Traffic equals the terminating traffic and is equiv-
l
alent to 50 percent of total traffic; i.e., 381.5 ccs.
The Intercom Originating Traffic (To) can be expressed as a
l
percentage X of the Originating Traffic.
Total Traffic divided by the number of lines results in a traffic
per line (cc-s/line) figure.
Intercom Traffic expressed as ccs/line must have the Intercom
Traffic divided by (number of lines divided by 2). This doubling
of ccs/line derives from the fact that two lines are involved for
each intercom call.
The number of lines are expressed as N.
SECTION 9105/91 l O-096-180-NA
The total level of all noise sources
System impedances are:
The delay difference is less than 200 s be-
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