RAD Data comm IPmux-16 Round Trip Delay, Ethernet Throughput Unframed T1, T1 interface =

Chapter 1 IntroductionIPmux-16Installation and Operation Manual

	Table 1-4.	Ethernet Throughput – Unframed T1
TDM	Frame	Over head	Over head	Packets	Throughput
bytes/frame	length	(bytes)	(%)	(per	(Mbps)
	(bytes)			second)
48	94	46	96	4107	3.08
96	142	46	48	2054	2.32
144	190	46	32	1369	2.07
192	238	46	24	1027	1.95
240	286	46	19	821	1.87
288	334	46	16	685	1.82
336	382	46	14	587	1.78
384	430	46	12	513	1.76

➤To calculate Ethernet throughput and intrinsic PDV as a function of TDM bytes/frame:

Ethernet load (bps) = [(frame overhead (bytes) + TDM bytes/frame) ⋅ 8] ⋅ frames/second

Frame overhead = Ethernet overhead + IP overhead = 46 bytes

Frame/second =

unframed: 5447/n for a full E1 4107/n for a full T1

framed:	8000Xk / (46.875 x n)
	Where k = number of assigned timeslots
	Where n =	TDM bytes/frame
	48

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(∝s) = 2 x ( 48 ⋅n x 125 (∝s) + PDVT buffer (∝s) +500 (∝s))+ Network round trip delay

NTS

Where n = TDM bytes/frame 48

Where NTS = number of timeslots assigned in unframed E1 interface = 32

T1 interface = 24

1-14 Functional Description