DRAG DROP
Drop
A.
B.
C.
D.
Explanation/Reference:
Explanation: 1) T1 or E1 with CAS or PRI: PBX to PBX2) FXO: off-net3) FXS: local4) FXS orswitcH. on-net5) E&M, FXO, FXS: PLAR
Explanation
PBX to PBX connections can use T1 or E1 with CAS or PRI: PBX can connect to a network through T1 orE1 lines with channel associated signaling (CAS) or Primary Rate Interface (PRI) signaling.
For off-net calls, the typical connection between the router and the PSTN is through FXO port. A local calljust needs FXS ports so it is the only choice for this type of call. We can make on-net calls through FXS port(phone directly connected to the router) or FXO port (phone connected to a PBX). The “switch” here meansthat we can connect an IP phone through a switch and place on-net calls through Cisco Unified.
Communications Manager. A PLAR call can work with any type of signaling, including E&M, FXO, FXS interfaces.
Topic 2, Volume B