RAD Data comm IPmux-1E Ethernet Throughput Unframed E1, Ethernet Throughput Unframed T1

IPmux-1/1EInstallation and Operation Manual Chapter 1 Introduction

integer between 1 and 8. Configuring TDM bytes/frame to a higher value reduces the IP/Ethernet overhead segment of the total packet and thus can significantly reduce the total Ethernet throughput.

On the other hand, packetization delay and intrinsic packet delay variation (PDVT) are increased; this contributes to a higher end-to-end delay. This effect can be small and negligible when a full E1 (or many timeslots) are transferred but can be very significant when few timeslots are transferred. In this case, the packetization delay and the intrinsic PDV when configuring a large value of

TDM bytes/frame can be very large and may exceed the maximum PDVT (jitter) buffer on the receiving end. Table 1-4and Table 1-5show throughput as a function of the TDM bytes/frame configuration for full E1 and full T1.

	Table 1-4.	Ethernet Throughput – Unframed E1
TDM	Frame	Overhead	Overhead	Packets	Throughput
bytes/frame	Length	(bytes)	(%)	per	(Mbps)
	(bytes)			Second
48	94	46	96	5447	4.1
96	142	46	48	2724	3.1
144	190	46	32	1816	2.76
192	238	46	24	1362	2.6
240	286	46	19	1089	2.5
288	334	46	16	908	2.43
336	382	46	14	778	2.38
384	430	46	12	681	2.34

	Table 1-5.	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

Functional Description 1-21

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