Sagem 4450E - Manual (Page 46)

SAGEM 3P@C
3P@C Installation Manual
Page 2-23 Reproduction and communication in any form prohibited without the written permission of SAGEM SA
1.1.1.28 1.1.1.28 1.1.1.28 1.1.1.28 Interface features of the DS-4ITX module
Table 2-20 Interface features of the DS-4ITX module
Module
type Quantity of
interfaces Interface
type Interface
attributes Fiber
specifications Transmission
distance
DS-4ITX 4 RJ-45 10/100Base
-TX Category-3/4/5
shielded/unshiel
ded twisted
pairs 100m
2.6. 2.6. 2.6. 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
Front face Rear face
Connection
socket
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.