telephony

Question 1

what do switch tails provide a connection between?

Answer 1

the PBX and the distribution frame

Question 2

how do system port circuits connect to station blocks

Answer 2

switch-tail connectors

Question 3

what 3 things does a PBX supply

Answer 3

battery
ringing voltage
dial tone

Question 4

when discussing an EKS system how do you denote capacity

Answer 4

first number is max trunk ports

second number is max line ports

Question 5

system trouble

Answer 5

affects multiple users probably a pbx issue

Question 6

pbx

Answer 6

private branch exchange

Question 7

how is grade of service

Answer 7

probability of a call being dropped

Question 8

tt568b pinout

Answer 8

orange green blue brown

Question 9

what is the nominal voltage for battery

Answer 9

48 VDC

Question 10

t568a pinout

Answer 10

green orange blue brown

wg g wo b wb o wb b

Question 11

what are the 3 topologies

Answer 11

open-loop
closed-loop
hom-erun

Question 12

what is the nominal voltage for alerting

Answer 12

90 VRMS

Question 13

what is the transmission speed of a t-1 circuit

Answer 13

1.544mbps

Question 14

home-run

Answer 14

a wire goes from NID to each device individually

Question 15

what is the difference between a hard and a soft key

Answer 15

hard key cannot be changed

soft key can be assigned by software

Question 16

station trouble

Answer 16

one user issue probably caused by cabling

Question 17

open-loop topology

Answer 17

wiring ends at last jack

Question 18

closed loop topology

Answer 18

wiring begins and ends at NID

Question 19

list three major components of a PBX

Answer 19

common equipment
station
CO lines

Question 20

what standard should be used for grounding in the pbx room

Answer 20

ansi tia eia 607A

Question 21

what are the advantages of using a butt sett

Answer 21

tone and pulse operation
last number
redial
two way speaker phone

Question 22

CO

Answer 22

central office

Question 23

what happens during off hook and on-hook events

Answer 23

off hook closes loop. on hook opens loop

Question 24

line circuit

Answer 24

connects end user to PBX (private branch exchange) or CO (central office)

Question 25

trunk

Answer 25

connect PBX to PBX, CO to CO or PBX to CO