Cisco Systems IPMUX-1E operation manual Round Trip Delay, Ethernet Throughput in CESoIP Mode

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

The maximum Ethernet throughput in dynamic CAS mode is calculated by:

[( payload8000 ) x ((payload+ 4) x TS) + 4 + frame overhead] x 8 bits

•where frame overhead is 46 bytes, including MAC, LLC, IP, and UFP layers

•where TS = number of configured time slots

•where payload = number of active time slot bytes per frame (24 to 64)

Note
	The frame overhead does not include:
	• Preamble field: 7 bytes
	• SFD field: 1 byte
	• Interframe gap: 12 bytes
	• VLAN field (when used): 4 bytes.

Ethernet Throughput in CESoIP Mode

Configuring the packet delay and the number of time slots controls the Ethernet throughput. The range of the packet delay is 3 to 127 msec.

A large number of time slots and a long packet delay can surpass the maximum Ethernet frame size.

The maximum Ethernet throughput in CESoIP mode is calculated by:

[(	1000	) x ((	packet delay	) x TS) + 12 + frame overhead] x 8 bits
	packet delay
		8

•where frame overhead is 46 bytes, including MAC, LLC, IP, and UFP layers

•where TS = number of configured time slots:

for an unframed E1 interface = 32 for an unframed E1 interface = 24

•where packet delay = 3 to 127.

Round Trip Delay

The voice path round-trip delay is a function of all connections and network parameters. The calculation for E1/T1 in each connection mode is described in the following sections.

1-22 Functional Description