Verilink T1 ESF CSU (34-00309.B) Product Manual Manual de usuario descargar pdf (Pagina 19)

Introduction

ESTING

Introduction

This chapter describes the diagnostic and test features of

Verilink’s T1 ESF CSU. The unit is controlled manually using

front panel DIP switches (the DIP switches are discussed on

page 5). The front panel indicators and side bantam jacks are

described below.

Indicators

The unit indicators convey major alarm conditions and looping

status.

POWER

This green indicator lights when power is applied to the unit.

LOOPBACK

This amber indicator lights under the following conditions: the

NET LOOP switch is set to Manual; the EQUIP LOOP is placed

in the Enabled position; or the unit receives an inband (or

out-of-band) loop code from the network.

NET LOS

This red indicator lights if the internal alarm circuitry detects a

loss of signal condition for

≥

175 bit times or if it detects an

unframed error from the network. The indicator stays lit until the

unit detects

≥

4 pulses in 32 bit times.

EQ LOS

This red indicator lights if the internal alarm circuitry detects a

loss of signal condition for

≥

175 bit times or if it detects an

unframed error from the DTE. The indicator stays lit until the

unit detects

≥

4 pulses in 32 bit times.

Loopbacks

Equipment

Position SW1-5 sets equipment loopback functions. When the

switch is set to Enabled, the unit is placed into an equipment

loopback where the DTE receives all the data it sends. The unit

sends an unframed all ones pattern to the network end. The unit

remains in equipment loopback until the switch is set to

Disabled.

Figure 3-1 Local Loopback

Equipment

T1 ESF CSU

Network

AIS

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Verilink T1 ESF CSU (34-00309.B) Product Manual Manual de usuario Pagina 19

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