3Com SuperStack II 3C16670A Посібник користувача - Сторінка 3
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I
NTRODUCTION
The SuperStack ™ II Hub 10 12 Port TP (3C16670A) has 12 dedicated
twisted pair ports on the front panel and an AUI port on the rear panel.
The rear panel also has a slot for a 3Com Transceiver Module or Bridge
MicroModule; if fitted the Module will operate in place of the AUI port. A
range of different media Transceiver Modules is available from 3Com
(see
" Products and Bulletin Boards "
The Hub 10 12 Port TP can be stand-alone or linked with other
SuperStack II Hub 10, LinkBuilder FMS II, FMS, 10BT or 10BTi units to
form a stack of units of different media. Each stack is the equivalent to a
single IEEE 802.3 repeater, so stacking units gives you the benefit of a
higher port count.
The Hub 10 12 Port TP is suited for office use where it can be
wall-mounted, rack-mounted, or free standing. Alternatively, the unit can
be rack-mounted in a wiring closet or equipment room. A mounting kit
is supplied.
The Hub 10 12 Port TP can be powered either from the AC mains supply,
or through an optional 3Com Redundant Power System (3C565047) to
provide a more reliable supply. Contact your supplier for details.
Repeater Functions
The Hub 10 TP has been designed to conform to the IEEE 802.3 standard
for Local Area Networks, and provides all the standard functions of an
802.3 repeater, including:
Signal retiming
Preamble regeneration
Fragment extension
Automatic partition/reconnection
Management
A SuperStack II Hub 10 Management Module (3C16630A) or Advanced
RMON Module (3C16632) can be fitted to the Hub 10 12 Port TP to
provide f ull SNMP management , including statistics, resilient links and
security features . Only one Management Module or Advanced RMON
Module is required for each stack. Refer to the guides accompanying the
module for details on how to manage an Hub 10 unit or stack.
Resilience and Security
H ub 10 Management Module (3C16630A) and Hub 10 Advanced RMON
Module (3C16632) offer resilience and security f eatures.
Up to 16 resilient link pairs can be configured via management software.
To avoid the creation of loops during power-up, Hub 10 units provide a
Disable On Boot switch. If this switch is set to disable, all TP ports on the
unit will be disabled during power-up until they are correctly configured
H
OW TO
Numbered elements in this diagram refer to numbered sections in the text.
These numbers, in bold, are used as reference
for a list).
U
SE THE
and enabled by management software. This is only necessary on units
which have ports assigned as standby. Standby ports in resilient link
pairs can only be configured on SuperStack II Hub 10 or LinkBuilder
FMS II units.
Security features are described in the manual which comes with your
Hub 10 Management Module.
By disabling ports on boot up and enabling them with management
software, you provide extra security for the unit.
During the power up sequence, the main ports (on the front
i
panel) are disabled BUT the AUI and Transceiver Module ports
will be enabled for periods of up to 1 second. During this brief
moment, the AUI and Transceiver Module ports are NOT secure.
Network Connections
You can connect the Hub 10 12 Port TP to any Data Terminal Equipment
(DTE) fitted with a 10Base-T network adapter or a 10Base-T transceiver.
Connect one end of the twisted pair cable to the RJ45 port on the unit
and the other end to the RJ45 port on your network adapter or
transceiver. You can attach up to 12 twisted pair segments to the front
of the unit.
The Hub 10 12 Port TP can use both shielded 150ohm, and unshielded
or shielded 100ohm twisted pair cables. To remain within 802.3 10Base-T
rules the maximum length of cable between the unit and any DTE
should not be greater than 100m (110 yards). Consult your supplier's
technical support department if you need to use twisted pair cables
over greater distances.
You can connect any 802.3 transceiver to the unit using an AUI cable
connected to the AUI port on the rear panel. Alternatively, you can fit
one of the 3Com Transceiver Modules or Bridge MicroModule into the
slot on the rear panel (see
the Hub 10 12 Port TP will automatically use the Transceiver Module or
Bridge MicroModule instead of the AUI port.
You can connect the Hub 10 12 Port TP to any other 10Base-T repeater
using port 12, to form an inter-repeater link. You must switch port 12 to
MDI to bypass the internal cross-over normally implemented by
10Base-T unit ports: see
Important
To manage this hub, you may n eed a new v ersion of the agent
software installed on y our Management Module. See
Management "
H
10
UB
" Products and Bulletin Boards "
" MDI Switch "
.
for details.
for list). If fitted,
" Stack