| >DECrepeater 900TM questions
>---------------------------
>1. The tender asks for the hub to CORRECT POLARITY of 10BaseT ports. What is
> this ? Can DECrepeater 900TM do this ?
I think this is asking if the 900TM will detect whether the correct cable
(cross-over or straight-through) is being used and make the necessary
adjustment. The 900TM does not have this feature.
>2. What are the security facilities in DECrepeater 900TM for detection of
> intruders ? If DECrepeater 900TM does not have any, any other 10BaseT module
> which will provide it ? And the availability date please.
The 900TM has per port security which is enabled via HUBwatch. This
allows the manager to set the security for both intrusion and eavesdropping
so that no unauthorized users can either send or receive on a particular
port with security enabled. In general, what happens is that the repeater
checks the address of the receiver against the address for which
the message is intended, and if there is no match, then a garbled message
is sent to that port instead of the actual data. Thus, only the port for
which the message is intended actually gets the message. A similar thing
is done for a port that is sending a message thus giving security for
intrusion and eavesdropping.
This feature is available on the 900TM today.
Cathy
|
|
>>DECrepeater 900TM questions
>>---------------------------
>>
>>1. The tender asks for the hub to CORRECT POLARITY of 10BaseT ports. What is
>> this ? Can DECrepeater 900TM do this ?
The DECrepeater 900TM DOES have the ability to correct the polarity of
received data on its 10BaseT ports. The DECrepeater 900TM 10BaseT ports will
correct the polarity of the received data if the port senses that the
received data packet waveform is reversed due to a wiring error. This
receive circuit polarity correction allows subsequent packets to be repeated
with correct polarity.
HUBwatch reports this port polarity status.
A DECrepeater 900TM 8-pin RJ-45 connector has the following pin-out.
Rx+ Pin 1
Rx- Pin 2
Tx+ Pin 3
Tx- Pin 6
The DECrepeater 900TM polarity correction corrects the case when the
attached cable wires its RX+ circuit to Pin 2 and its Rx- circuit to
Pin 1.
Note: This does not correct the problem of using a cross-over cable when
a straight-through cable is needed and vica versa. It also does not
correct mis-wiring of the transmit pair.
>>2. What are the security facilities in DECrepeater 900TM for detection of
>> intruders ? If DECrepeater 900TM does not have any, any other 10BaseT module
>> which will provide it ? And the availability date please.
See Note 356.1 for a detailed description of the DECrepeater 900TM's
security functions.
Regards,
Rich Pagliaro
|