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Chapter 8: LAN Connections and Performance

There are rare cases with older LAN equipment in which it may be necessary to disable autonegotiation. If

crc-errors or short packet errors are seen in the management statistics of the LAN port, the attached LAN

equipment has probably configured itself to half-duplex mode and colliding packets are being lost. In such

a case, autonegotiation should be disabled on both the converter and the attached LAN equipment, with

both forced to 100BaseTX full-duplex. Autonegotiation interoperability and standards were not well

understood by the industry at the inception of 100BaseTX, resulting in some older LAN equipment not

understanding the converter's autonegotiation advertisement of strictly full-duplex capability.

It is highly desireable to leave autonegotiation enabled so that changing attached LAN equipment does not

result in the new equipment defaulting to half-duplex if set to autonegotiate. Autonegotiation must always

be enabled for 1000Mbit/s links.

LAN Cabling

It is important to use the correct cabling for proper operation. Use UTP Category 5 network cable with RJ-

45 connectors for the LAN ports, and do not exceed 100 meters (328 feet) in length. Either a straight-

through or crossover cable may be used.

LAN Segmentation and Packet Switching

This converter does not perform MAC address filtering. This reduces system latency by removing two

steps of filtering that have already been performed by attached routers or switches.

LAN Buffering, Loading and Flow Control

This converter contains approximately 500kBytes of total packet buffer. Queue utilization can be

monitored at the converter's statistics HTTP page, and buffer overflow will appear as “Rx oflow” errors at

the same HTTP page.

If the converter's packet memory begins to fill up, the converter applies flow control techniques to the

machines connected to its LANs rather than simply dropping incoming packets. For connected

100/1000BaseTX LANs the converter uses 802.3x flow control. Flow control creates a much more

efficient network by avoiding time-out requirements for packets that would otherwise be dropped during

bursts of network traffic.

Unless disabled in the settings or during autonegotiation, the converter will transmit pause frames to

attached LAN equipment when its buffer has reached approximately 60% capacity. During autonegotiation,

the converter indicates to the attached equipment that it will ignore received pause frames. It would be

unlikely that such frames would be useful as the maximum data rate transmitted by the 100Mbit/s LAN port

of the converter is less than the incoming DS3 rate.

If overflow errors appear for a 1000Mbit/s port at the statistics management page of the converter, confirm

that the pause packet counter shown there is incrementing and that the attached LAN equipment can accept

pause packets. If the overflow errors disappear when the LAN port speed is reduced to 100Mbit/s, it is

possible that the attached LAN equipment is not receiving pause packets in time to interrupt large

1000Mbit/s traffic bursts. It may be necessary to operate at 100Mbit/s in this case, if packet loss during

bursts is unacceptable.

LAN Packet Priority

LAN packets may optionally contain class of service (CoS) information (802.1p information), which may

be used to specify packets that are time critical. Queue space is reserved in the converter to allow frames

with a “high” 802.1p CoS priority setting (configurable in firmware beginning July 2008 or >=6 on older

firmware) to bypass existing frames waiting to be transmitted to the DS3/E3. This allows voice and other

high-priority traffic to experience low-latency transmission.

LAN Packet Order

On single-telecom converters, LAN packets order is guaranteed with the exception that high-priority 802.1p

CoS packets may be transmitted before lower priority packets. On dual-DS3/E3 converters, packet

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 29 30

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Uniden SSE17+1 Manuale del Proprietario (40 pagine)

Marchio: Uniden | Categoria: Telephones | Dimensione: 0.88 MB |

Indice

XDECT SSE37

IMPORTANT SAFETY INSTRUCTIONS

WHAT’S IN THE BOX?

CONTENTS

INSTALLING YOUR PHONE

Remove the Stand

Test the Connection

Select the Country

Using the Belt Clip

GETTING TO KNOW YOUR PHONE

Parts of the Handset

1300366895

USING THE MENUS

Phonebook Menu

Intercom Menu

Recent Calls Menu

Base Setup/Handset Setup Menu

Date & Time Setting

Advanced Setup Menu

Answering Setup Menu

Entering Text on Your Phone

USING YOUR PHONE

Using Call Waiting

Using the Phonebook

Chain Dialing

USING SPECIAL FEATURES

Call Blocking Entry Options

Call Blocking Menu Options

Blocking a Number

Using the Audio Boost

DND (Do Not Disturb) Mode

Using Multi-Handset Features

Call Transfer

Intercom

Using an Optional Headset

USING THE ANSWERING SYSTEM

Anderson, Jim

11:35 AM 1/04

1:Repeat 3:Skip

4:Delete 5:Stop

Getting Your Messages

Programming a Security Code

Dialing in to Your System

IMPORTANT INFORMATION

Resetting Base

Registering a Handset

ONEYEAR LIMITED WARRANTY

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E3Switch DS3 Specifiche Pagina 19

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