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4.2 When calling for assistance
Please be prepared to provide the following information.
1. A complete description of the problem, including the following points:
a) The nature and duration of the problem
b) Situations when the problem occurs
c) The components involved in the problem
d) Any particular application that when used, appears to create the problem
2. An accurate list of the RS product model(s) involved, with serial number(s). Include the
date(s) that you purchased the product.
3. It is useful to include other network equipment models and related hardware, includ-
ing personal computers, workstations, terminals and printers, plus the various network
media types being used.
4. A record of changes that have been made to your network configuration prior to the
occurrence of the problem. any changes to system administration procedures should
all be noted in this record.
Important: RS
Dual-speed hubs contain no user serviceable parts. Attempted service by
unauthorised personnel shall render any and all warranties null and void.
5.0 Specification
The
RS
dual speed stackable hubs support two traffic domains, one at 100Mbps and one
at 100Mbps and one at 10Mbps. Each hubs has ports, and and are stackable up to 4 units
high operating as one repeater.
Performance
When a port is operating at 100Mbps
PDV (Path delay value): 80BT, exceeds class 11
When a port is operating at 10Mbps
Date rate: 100Mbps
PDV (path delay value): 80BT, exceeds class 11
When a port is operating at 10Mbps
Data rate: 10Mbps
Partitioning: Enforced after 63 consecutive collisions
Auto-reconnect: Occurs after one packet of error-free reception
Network standards
Ethernet IEEE 802.3u, 100BASE-TX
Ethernet IEEE 802.3, 10BASE-T
Packet-processing between domains (internal 10/100 switch or bridge)
Filtering and forwarding rate from 100Mbps ports: 148,800 pps max.
Filtering and forwarding rate from 10Mbps ports: 14,880 pps max.
Processing type: Store and forward
Auto-learning: 8K address table, shared for both traffic domains
Packet buffers: 2MB, dynamically allocated and shared on both domains
Latency (not included packet time):
100 to 10Mbps: 5µs
10 to 100Mbps: 5µs
CPU type: State machine
Maximum Ethernet segment (or domain) lengths
10BASE-T (unshielded twisted pair)
-100m (328ft)
100BASE-TX (CAT 5 UTP)
-100m (328ft)
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1.0 Introduction
1.1 Inspecting the package and product
Inspect the contents of this package for any signs of damage and ensure that the items list-
ed below are included.
This package should contain:
1
DS8A or DS8B dual-speed hub
1
AC power cord
1
Stacking cable, (DS8A only)
1
Installation and user guide
1.2 Feature and benefits
●
Supports 10 or 100Mbps network connections on each port
The RS dual-speed hubs combine two logical hubs, one at 10Mbps and one at 100Mbps,
in a single unit supporting two traffic domains. Each port can operate at either 10 or
100Mbps independently of the other ports.
●
Auto-sensing for speed
All ports support 10/100 auto-negotiation for speed, operating separately on each port.
Any mix of 10Mbps and 100Mbps users can be connected to the ports. Individual ports
can change to 10Mbps or 100Mbps speed at any time, adapting automatically to any
changes in the connected devices speed. Speed-sensing complies with IEEE 802.3u, pro-
viding inter-operability with other products.
●
An internal switch connects the 10 and 100Mbps domains on model DS8-B
Model DS8-B has an internal switch for filtering/forwarding traffic between the 10 and
100Mbps domains, allowing all connected devices to talk to each other. High performance
switching provides full bandwidth in each domain, unaffected by local traffic on the other
domain. One DS8-B per stack supports switching for all ports.
●
Stackable for flexible expansion
The hubs can be stacked up to four units high or up to 32 ports, each 10/100 dual speed.
As additional units are added in a stack, the 10 and 100Mbps traffic domains are expand-
ed automatically to support the new ports at either 10 or 100Mbps speed.
●
Transparent operation
Model DS8-B hub operates as a hardware switch, only forwarding those packets from each
domain that are needed on the other domain. Internal address tables are self-learning,
enabling users to change port connections or 10/100 domains without affecting operations.
The switch in the DS8-B will not affect any standard software applications or SNMP network
management platforms.
●
Small enclosure enables use in offices and labs
The compact packaging of the hubs allows them to be installed in offices and labs, or vir-
tually any location within reach of a standard AC wall outlet. They come in a durable metal
enclosure for table-top or wall-mounting.
1.3 Product description - general
The
RS
dual-speed hubs have eight RJ-45 ports, each 10/100Mbps auto-sensing. Each port
can independently identify (via IEEE 802.3u auto-sensing) and accept either 10Mbps or
100Mbps Ethernet signals, adapting to match the best speed of the connected device.
There are two internal traffic domains, one for the 10Mbps traffic and one for the 100Mbps
