Cabletron Systems MR-9000TPT User Manual - page 10

Page 2-2

Minimum packet

repeated:

96 bits including preamble. Packet

fragments are extended using the

JAM (1,0) data pattern.

FAULT protection:

Segment disconnect occurs after 32

consecutive collisions, or when a

segment’s collision detector is on for

longer than 2 to 3 ms. FAULT

protection resets automatically after

one packet is transmitted onto the

FAULT protected segment without

causing a collision.

RJ-45 Interface (Port 1 - 8)

Transmitter

Bandwidth:

15.0 MHz normal; 13.5 to 16.5 MHz

worst case

Signal amplitude

(balanced):

2.2 V normal; 1.8 to 2.6 V worst case

Idle signal frequency: 1.0 MHz normal; 0.9 to 1.1 MHz worst

case

Idle turn-on delay:

1200 ns normal; 1000 to 1400 ns worst

case

Output impedance:

100 ohm normal; 90 to 110 ohm worst

case

Receiver

Receive threshold:

320 mV

Data frequency:

3.5 to 12 Mb/sec

Common mode

rejection ratio:

Greater than 65 dB

Near end crosstalk:

-23 dB max.

Input impedance:

100 ohm normal; 90 to 110 ohm worst

case

Internal transceiver:

Cabletron Systems TPT-2 transceiver

SPECIFICATIONS AND REQUIREMENTS