Verilink 2000 (34-00182) Product Manual Manual do Utilizador descarregar pdf (Página 16)

2-4 INSTALLATION

Configuration

Switch S3

Switch S3 (Figure 2-2) is used to set the configuration parameters listed in the

following paragraphs. Refer to the Terminal Operation chapter of this manual for

more information on the related software-controlled configuration commands.

Network LBO

Positions S3-1 and S3-2 set the line build out signal level of the transmit data

(TXD) from the unit to the network. The output level is factory set at 0 dB

. It may

be attenuated by -7.5 dB, -15 dB, or -22.5 dB if operating conditions require that

it be changed. The telco should provide the proper setting to the user.

If unsure of

the exact setting, then leave it at the default value. The values are listed in

Table 2-1.

DTE LBO

Positions S3-3, S3-4, and S3-5 set the line build out to one of the values listed in

Table 2-2. The transmit output level is selectable according to the cable length

between the DTE port and the attached equipment. The factory default setting is

0-110 feet

Table 2-1

Network LBO

S3-1 S3-2 Network LBO

Dn Dn 0 dB

Dn Up -7.5 dB

Up Dn -15.0 dB

Up Up -22.5 dB

Table 2-2

DTE LBO

S3-3 S3-4 S3-5 DTE LBO

Dn Dn Dn 0 -110 ft

Dn Dn Up 110-220 ft

Dn Up Dn 220-330 ft

Dn Up Up 330-440 ft

Up Dn Dn 440-550 ft

Up Dn Up 550-655 ft

Up Up Dn > 655 ft

Up Up Up Square

7654321 8

Dn Up

NET LBO

DTE Level

Clock Source

Figure 2-2

Switch S3

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 57 58

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