IBM VOL-2008 User Manual

Volition™Networking Mini-Hub

Volition Dual Speed

Mini-Hub VOL-2008

The VOL-2008, is a compact Dual
Speed, stackable Mini-Hub designed
for work groups or SOHO (small
office/home office) LANs. The

Mini-Hub offers eight dual speed,
auto sensing 10/100T/TX ports
and one 100-FX VF-45™fiber port.
The VOL-2008 is an unmanaged Hub
with an internal switch engine for
seamless operation on speed mixing
environments. The unit is powered by
an internal auto-ranging power supply
and is housed in a rugged metal case
for greater reliability. In addition, the
VOL-2008 can be stacked up to
4 units high via a DB25 100 Mb
connection located in the rear of the
unit. The VOL-2008 complies with
IEEE 802.3 and 802.3u standards.

Specifications for VOL-2008

Standard Compliance

IEEE 802.3 10Base-T Ethernet™
IEEE 802.3u 100Base-TX/FX Ethernet

Optical Specifications (100-FX, VF-45)

Type 100Base-FX multimode, 1300 nm
Connector VF-45

21

Transmission Half duplex
Transmission power -20 dBm (minimum)
Sensitivity -31 dBm (maximum)
Fiber 62.5/125 µm
Distance See Appendix A

Number of Ports

8 10/100 Mbps auto-sensing RJ-45 Ethernet ports with switch agent.
Selectable 8th port, as 10/100 Mbps twisted pair, or 100 Mbps fiber optic
Port 8 selection done using a selector switch

Number of Segments

2 independent segments 10 Mbps and 100 Mbps

LED Display

Per device Power

Per port Link/Rx

• TX-N-twisted pair (normal)

• TX-X-twisted pair (crossed)

• VF-45, 100-FX fiber

Collision indication for 10 Mbps and 100 Mbps segments

10 Mbps/100 Mbps

Number of Hubs per Stack

4 Hubs per stack
Dedicated DB-25 stack ports

Port Partitioning

Automatic partition per port

Port Requirements

90-240 VAC, 50-60 Hz (internal auto-ranging power supply)

Features — Benefits

Internal switch agent between 10 Mb and 100 Mb bus
Eight 10/100T/TX auto sensing ports
One 100-FX VF-45 uplink port
Mechanical switch to select 8th port operation (copper or fiber)
Stackable up to 4 units (DB25 connection)
Internal auto-ranging power supply (85-250 VAC, 50/60 Hz)
CE & FCC Class A Mark
IEEE 802.3 and 802.3u compliance

10 m UTP

308 m Fiber

100 m UTP

200 m Fiber

Specifications

Operating temperature 0° to 50°C (-32° to 122°F)
Storage temperature -30° to 60°C (-22° to 140°F)
Operation humidity 5% to 95% non-condensing
EMI certifications CE marking

Dimensions 31.1 cm x 11.5 cm x 4.45 cm

Weight 1.27 kg (2.8 lbs.) per unit
Shipping weight 1.8 kg (4 lbs.)

FCC Class A

12.24 in. x 4.53 in. x 1.75 in.

Applications

Appendix A – Collision Domain
and Distance

In shared fast Ethernet™, the collision
domain limits the operating distance of
the network. In any collision domain,
the round trip propagation delay must
not exceed 512 bit times. Each bit
time in fast Ethernet is 10 ns. The
following table gives typical delays as
specified by the IEEE 802.3 standard.

VOL-2008 Mini-Hub

To calculate other distances for
fiber use the following formula:
Fiber distance (m) - 320 – UTP length
(m) x 1.112 (all units in meters). The
VOL-2008 Mini-Hub is a Class II
repeater. The following diagram
illustrates some operating distances
on fiber and copper.

Example 1

Applications

Component Round Trip Delay Maximum Delay

in Bits/Meter

Two TX/FX DTE’s N/A 100
Cat 3 Cable Segment 1.14 114 (100 m)
Cat 5 Cable Segment 1.112 111.2 (100 m)
Fiber Cable 1.00 412 (412 m)
Class I Repeater N/A 140
Class II Repeater TX/FX N/A 92

Example 2