Multi-Tech Systems DT101/xx, DT102/xx LED Indicators, Data/Command Indicators

DataTalker Owner’s Manual

3.1 Introduction

This chapter describes the DataTalker front and back panels and switches. The front panel contains LED indicators for the data channel device, voice/fax channels, and the composite link. It also contains one or two switches, depending on whether it is a desktop or rack version. The back panel contains connectors for the data/command device, internal and external composite link devices, and the voice/fax channel devices. The desktop version also has a power switch.

3.2 Indicators

The DataTalker is equipped with a complete set of LED indicators on the front panel that show precisely what is occurring on the network at all times. By periodically checking the indicators you can keep abreast of system activity without tying up the channel device. There are three groups of indicators: data/command, voice/fax channel, and composite link. Use black legends on dual function composite link indicators with an internal DSU, blue legends with an internal modem, and underlined legends, such as TA, with an ISDN terminal adapter. On the desktop DataTalker the indicators are arranged horizontally, whereas on the rack-mounted DataTalker they are arranged vertically, but the relative position and function is the same on each. Table 3-1 explains the function of each indicator by group.

Data / Voice / Fax Concentrator

VOICE /

FXS

FXO

E&M

FAX

XMT

RCV

XSG

RSG

RXT

FCR

RD

TM

V35

EXT

MDM

DSU

TA

FAX 2

COMPOSITE

LINK

28.8

DTR

DBUP

OH

DATA/

VOICE /

STATUS

COMMAND

XMT RCV FC COM ORIG

FAX 1

FXS

FXO

E&M

FAX

XMT

RCV

XSG

RSG

CD

RCV

XMT

CTS

56

RTS

NS

OOS

2B

101 MDM/TA

Figure 3-1. Front Panel (Desktop Version)

Table 3-1. LED Indicators

Data/Command Indicators

XMT (Transmit) This indicator lights when the device connected to the data or command channel is transmitting data to the DataTalker.

RCV (Receive) This indicator lights when the device connected to the data or command channel is receiving data from the DataTalker.

FC (Flow Control) This indicator lights when the DataTalker has stopped channel data flow because the channel buffer is almost full. If the DataTalker stops data flow at the request of a remote device, the Flow Control Received (FCR) indicator also lights. If the DataTalker stops data flow for any other reason, the FCR indicator remains off.

			Data Flow
	Async		Composite
Host	Channel	Host	Link
CPU		DataTalker
	FC LED ON	FCR LED ON

Flow Control

Remote

DataTalker

FC LED ON

Async

Channel

Remote

Device

COM (Command) This LED indicates whether the data or the command channel is selected. It lights when the command channel is selected (DIP switch 3 is down), and is off when the data channel is selected (DIP switch 3 is up).

36