Sagem 4450E 2.6.Route Transfer Unit (RTU)

SAGEM 3P@C

1.1.1.28Interface features of the DS-4ITX module

Table 2-20 Interface features of the DS-4ITX module

Module	Quantity of	Interface	Interface	Fiber		Transmission
type	interfaces	type	attributes	specifications		distance
DS-4ITX	4	RJ-45	10/100Base	Category-3/4/5		100m
			-TX	shielded/unshiel
				ded	twisted
				pairs

2.6.Route Transfer Unit (RTU)

At present, some special application modes of 3P@C 4450E need to be supported by the RTU, including the non-PPPoE packet filtering and user name binding in the L2 PPPoE transparent transmission mode.

With the board structure, the RTU is composed of such components as chips, crystal oscillators and resistance-capacitance devices. It does not provide any external interface. It is installed on the SMUB (see Section 4.4.2 for its installation) and connected to the socket on the SMUB via the pins on the board to provide the L3 routing and flow table functions. Its structure is shown in the following figure.

Table 2-21 Structure of the RTU

Screw hole

	Connection
Front face	socket	Rear face

The RTU is optional. You may use it as required.

„When 3P@C 4450E uses the 100M electrical interface uplink interface module, though the RTU routing function can be provided, the L2 application mentioned above will be limited. To perfectly support the L2 application, it is necessary to add the RTU.

„When 3P@C 4450E uses the gigabit electrical interface uplink interface module, the L2 application mentioned above can be implemented without using the RTU.

When 3P@C 4450E uses the ATM interface uplink interface module, the RTU must be adopted so as

to provide the L2 application function mentioned above and the L3 function.

3P@C Installation Manual

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