Black Box Modular SwitchesInstallation and User Guide (8/99)

reduce the buffer space used. When the available free-buffer queue increases, the Switch will sen a “RESUME" packet to indicate the transmitter to start sending the packets. Of course, the transmitting device must also support the 802.3x flow control standard in order to communicate properly during normal operation.

Note: When in Half-Duplex mode, the Modular-switch implements a back- pressure algorithm on 10/100 Mb ports for flow control. That is, the switch prevents frames from entering the device by forcing a collision indication on the half-duplex ports that are receiving. This temporary “collision” delay allows the available buffer space to improve, as the switch catches up with the traffic flow.

4.7Power Budget Calculations for LE14XXA-Series 4PM’s with Fiber Media

Receiver Sensitivity and Transmitter Power are the parameters necessary to compute the power budget. To calculate the power budget of different fiber media installations using LE14XXA models, the following equations should be used:

OPB (Optical Power Budget) = PT(min) - PR(min)

where PT = Transmitter Output Power, and PR = Receiver Sensitivity

Worst case OPB = OPB - 1dB(for LED aging) - 1dB(for insertion loss) Worst case distance = {Worst case OPB, in dB} / [Cable Loss, in dB/Km]

where the “Cable Loss” for 62.5/125 and 50/125μm (M.m) is 2.8 dB/km, and the “Cable Loss” for 100/140 (Multi-mode) is 3.3 dB/km,

and the “Cable Loss” for 9/125 (Single-mode) is 0.5 dB/km

The following data has been collected from component manufacturer’s (HP’s and Siemens’) we sites and catalogs to provide guidance to network designers and installers.

Fiber

Speed,

 

Std.

Wave

Cable

X’mitr

R’cvr

Wors

Worst*

 

typica

typical*

Port

Std.

Mode

km

-

Size

Outpu

Sens.

t

distanc

 

l

distanc

Module

 

fdx

lengt

μm

t

PR

OPB,

e Km,

 

OPB,

e

 

 

 

 

 

 

(hdx)

h

 

PT , dB

,dB

dB

fdx

 

dB

Km, fdx

 

 

 

 

nm

 

 

 

 

 

 

 

 

LE1424C

10 Mb

Multi-

2

 

62.5/12

-15.0

-31

14

5

 

17

6

850

5

-9.5

-31

19.5

5.9

 

23.5

7

 

FL

mode

(2)

 

 

 

100/14

-19.5

-31

9.5

3.4

 

13.5

4.8

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

 

 

 

50/125

 

 

 

 

 

 

 

LE1428C

100Mb

Multi-

2

1300

62.5/12

-20

-31

9.0

2.5

 

14

5

 

FX

mode

(0.4)

 

5

-23.5

-31

5.5

2.0

 

12

4

 

 

 

 

 

50/125

 

 

 

 

 

 

 

LE1421C

100Mb

Single-

18+

1300

9/125

-15

-31

14

28

 

17.5

35

 

FX

mode

(0.4)

 

 

 

 

 

 

 

 

 

LE1422C

100Mb

Multi-

2

1300

62.5/12

-20

-31

9.0

3.0

 

15.8

5.5

 

FX

mode

(0.4)

 

5

-23.5

-31

5.5

2.0

 

12.2

4.0

 

 

 

 

 

50/125

 

 

 

 

 

 

 

35

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Black Box LE14XXA, Modular Switches manual Distanc Module
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LE14XXA, Modular Switches specifications

The Black Box LE14XXA series of modular switches are designed for high-performance networking in both small and medium enterprises, as well as in larger data center environments. These switches stand out due to their scalability, flexibility, and robust functionality, making them suitable for a variety of applications.

One of the main features of the LE14XXA modular switches is their modular design, allowing for the integration of various interface cards to tailor the switch to specific networking needs. This flexibility ensures that organizations can adapt their network architecture as requirements evolve, making it a future-proof investment. The switches support a range of modules, including Ethernet, fiber optics, and PoE (Power over Ethernet), which can be easily swapped out or added to support changing technology demands.

In terms of performance, the LE14XXA series offers impressive throughput capabilities, often supporting up to 10 Gbps per port. This speed is critical for businesses that rely on fast data transfer rates for tasks such as video conferencing, large file transfers, and real-time applications. The switches also feature advanced Layer 2 and Layer 3 functionalities, facilitating efficient data routing and switching, which is essential for maintaining effective network performance.

Security is another critical characteristic of the Black Box LE14XXA switches. They incorporate a variety of security protocols, including 802.1X port-based access control, VLAN support, and secure management interfaces, which help protect sensitive data and ensure compliance with industry standards. This makes them an excellent choice for organizations that prioritize data protection and regulatory compliance.

Ethernet redundancy protocols, such as Spanning Tree Protocol (STP) and Rapid Spanning Tree Protocol (RSTP), enhance network reliability by providing failover options in case of link failures. Additionally, the LE14XXA switches feature energy-efficient designs that comply with energy-saving standards, which can significantly reduce operational costs over time.

User-friendly management interfaces, including a web-based GUI and command-line interface (CLI), simplify the configuration and monitoring processes. This ensures that IT administrators can efficiently handle the network without extensive training or experience.

Overall, the Black Box LE14XXA modular switches combine advanced technology, security features, and versatile design, making them a powerful choice for modern networking needs. Their adaptability and high performance offer businesses the capability to build scalable and secure networks that can grow alongside their operations.
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