Specifications

IPmux-4 Installation and Operation Manual Chapter 1 Introduction
Functional Description 1-15
Round Trip Delay
The voice path round-trip delay, which is a function of all connections and
network parameters, is calculated for E1/T1 as follows:
RTDelay
(
µ
s)
= 2 x (
NTS
n48×
x 125 (µs) + PDVT buffer (µs) +500 (µs))+ Network round trip delay
Where n =
48
ebytes/fram TDM
Where NTS = number of timeslots assigned
in unframed E1 interface = 32
T1 interface = 24
End-to-End Alarm Generation
An end-to-end alarm generation mechanism exists in the IPmux-4 to facilitate the
following alarms:
Unframed AIS will be transmitted toward the near-end PBX in event of:
• Far-end LOS, AIS
• PDVT underflow/overflow.
Framed Timeslot / CAS configurable alarm pattern will be transmitted
toward the near-end PBX in event of:
• Far-end LOS, LOF, AIS
• PDVT underflow/overflow.
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