Black Box 40426, 40423, 40424, 40425 Specifications

Need online access for multiple users?

Don’t add more phone lines—just use the lines

you already have more economically.

Need online access for multiple users?

Don’t add more phone lines—just use the lines

you already have more economically.

Telephone Line Managers

© 2006. All rights reserved. Black Box Corporation.

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FEATURES

• Share one, two, four, or more
phone lines among multiple
analog phone devices.

• Operate automatically, on the fly.

• Maintain isolation (keep calls from
interrupting each other).

• Don’t cause line noise.

• No LAN or software required.

• Transparent to high-speed data rates.

• Cascade or add expansion modules
as your needs increase.

• One security device on each telco
line can protect all devices
on subscriber ports.

When placing outbound calls, any of the eight subscriber ports on the 4-Line 8-Port Manager

can bid for any of the four available telco lines simply by going off-hook.

OVERVIEW

If you’re in a small or medium-sized business, odds are that
you have more people needing to use the phone than you have
available phone lines. Rather than installing more lines, use our
Telephone Line Managers to help your office phone-system users
share the telco lines already installed in your building.

Maybe you’ve tried line sharers before, only to discover that
they let modem calls interrupt voice calls or vice versa. Telephone
Line Managers are different—they prevent later outbound calls
from interrupting earlier ones. And they can handle inbound
calls, too.

Unlike other devices that first answer incoming calls and
then re-ring the subscribers, the managers are very fast and
inobtrusive. They operate on the fly, and once the connection is
established, they’re transparent to calls that come through them.

The managers don’t put extra jitter or noise on the line. Also,
they don’t cause the voltage on the line to drop by more than

1.5 volts, which keeps even the most sensitive modems happy.
Plus they can support any modem data rate that standard
phone lines can carry.

The Telephone Line Managers accommodate everyone from
the single-telephone-line user to companies with six or more
phone lines. You can attach them to all kinds of analog devices,
including modems, faxes, PBXes, voice phones, and the analog
ports of ISDN terminal adapters.

The managers are completely automatic; they don’t have
to be programmed, and most models don’t even need to be
configured.

We offer four manager Base Unit models and three Expansion
Modules. These differ in how many phone-line ports and
subscriber (device) ports they have.

• The 1-Line 4-Port and 1-Line 8-Port Base Units (40423 and

40424) share one phone line among four or eight devices,

respectively. They are powered by the voltage present
on the phone line.

• The 2-Line and 4-Line 8-Port Base Units (40425 and 40426)
share two or four phone lines, respectively, among eight
devices. They are powered by an included external
transformer.

• The S and T Expansion Modules (40427, usable with the
2-Line 8-Port Base Unit; and 40428 and 40429, usable with
the 4-Line 8-Port Base Unit), each add eight subscriber
ports to your system. The T Module also adds two telco
ports. Modules can be stacked to create large switching
systems. They get their power from the base unit.

All manager ports are standard RJ-11 telco connectors

that use the center two pins.

Instead of using expansion modules to add ports, you can

cascade base units by connecting

a telco port on one base unit

to the subscriber port on another.

(Don’t cascade from the

subscriber

ports of 1-Line Base Units, though.)

When placing outbound calls, any of a 2-Line or 4-Line
Base Unit’s subscriber ports can bid for any of the available
telco lines simply by going off-hook. If all of the lines are
in use, the device won’t get a dial tone.

On the 4-Line Base Unit, you can enable or disable
inbound calls to individual ports. Inbound calls to ring­disabled ports are quickly aborted to keep the lines available
for outbound calls.

When you use the T Module with a 4-Line Base Unit, the
devices have access to two high-priority primary lines and two
shared alternate lines only for outbound calls. Inbound calls
are routed to the first two devices.

You can put security devices on a manager’s telco lines
to

protect all subscriber-port devices.

4-Line 8-Port Telephone Line

Manager (40426)

Phones

Up to 4 telco lines

Telco
ports

Subscriber

ports

Phones

Modem

Fax machine

PSTN

11/28/2006
#22000

724-746-5500 blackbox.com