SLXT915QC.B3 Intel, SLXT915QC.B3 Datasheet - Page 11

• Manufacturer Part Number: SLXT915QC.B3
• Description: IC QUAD ETHERNET REPEATER 64-QFP
• Manufacturer: Intel
• Type: Repeaterr

Specifications of SLXT915QC.B3

• Rohs Status: RoHS non-compliant
• Tx/rx Type: Ethernet
• Voltage - Supply: 4.75 V ~ 5.25 V
• Current - Supply: 240mA
• Mounting Type: Surface Mount
• Package / Case: 64-QFP
• Delay Time: -
• Capacitance - Input: -
• Lead Free Status / Rohs Status: Not Compliant
• Other names: 831529

2.0
2.1
2.2
2.2.1
2.2.2
2.2.3
Datasheet
Functional Description
Introduction
The LXT915 is an integrated hub repeater for 10BASE-T networks. The hub repeater is the central
point for information transfer across the network. The LXT915 offers multiple operating modes to
suit a broad range of applications from simple 4-, 8- or 16-port stand-alone models up to 128-port
stackable hubs.
The main functions of the LXT915 are data recovery and retransmission and collision propagation.
Data packets received at the AUI or 10BASE-T ports are detected and recovered by the port
receivers before being passed to the repeater core circuitry for retiming and retransmission. Data
packets received through the IRB port are essentially passed directly to the core for retransmission.
After recovery of a valid data packet, the repeater broadcasts it to all enabled stations, except the
originator station.
External Interfaces
The LXT915 includes four 10BASE-T ports with internal filters. The LXT915 also includes an
Attachment Unit Interface (AUI) port and an Inter-Repeater Backplane (IRB) port. The IRB port
enables multiple LXT915 devices to be interconnected, creating a large, single-segment, multi-port
repeater.
10BASE-T Ports
The four 10BASE-T transceiver ports are completely self-contained. Since the transmitters and
receivers include the required filtering, only simple, inexpensive transformers are required to
complete the 10BASE-T interface. Each individual Twisted-Pair (TP) port is implemented in
accordance with the IEEE 802.3 10BASE-T standard. Refer to
descriptions.
AUI Port
The AUI port operates in standard DTE mode and allows connection of an external transceiver
(10BASE-2, 10BASE-5, 10BASE-T or FOIRL) or a drop cable. Refer to
signal descriptions.
Inter-Repeater Backplane
The Inter-Repeater Backplane (IRB) allows several LXT915s to function as a single repeater. The
IRB also allows several multi-repeater boards to be integrated in a standard rack and to function as
a single unit. The IRB supports “hot swapping” for easy maintenance and troubleshooting. Each
individual repeater distributes recovered and retimed data to other repeaters on the IRB for
broadcast on all ports simultaneously. This simultaneous rebroadcast allows the multi-repeater
system to act as a single large repeater unit. The maximum number of repeaters on the IRB is
Intel
®
LXT915 Simple Quad Ethernet Repeater
Table 1
for TP Port signal
Table 2
for AUI Port
11