Traffic Engineering Flashcards
A concept or method of transmission planning that permits a relatively close approach to an overall zero transmission loss in the telephone network and maintaining singing and echo within specified limits
Via Net Loss
A discrete engagement or occupation of a traffic path
Call
The continuous one-hour period that, on consecutive days in the busy part of the year, contains the maximum average traffic intensity
Busy Hour
The inability to interconnect an idle inlet to an inlet outlet because all possible paths between them are already in use
Internal Blocking
The average number of calls during the busy hour
Calling Rate
The traffic intensity per traffic path. 100% occupancy implies all paths are busy
Occupancy
The international dimensionless unit of traffic intensity
Erlang
1 EBHC is the average intensity in one or more traffic paths occupied in the busy-hour by a two-minute call or an aggregate duration of two minutes
1/30 of an Erlang
Equated Busy-Hour Call (EBHC)
A unit of traffic intensity equal to 1/36 of an erlang
Century call-second per hour (CCS)
1 Cm is the quantity represented by one or more calls having an aggregate duration of 1 minute
Call-minute
The traffic intensity that would occur if all traffic submitted to a group of circuits could be processed
Offered Traffic (To)
The actual traffic intensity handled by the group of circuits
Carrier Traffic (Tc)
That portion of traffic that cannot be processed by the group of circuits
Lost Traffic (TL)
The proportion of a time a circuit is busy, or average proportion of time each circuit in a group in busy
Circuit Utilization (ρ)
A measure of probability that, during a specified period of peak traffic, a call offered to a group of trunks of circuits will fail to find an idle circuit at the first attempt
Grade of Service (GoS)
