Verilink PRISM 4051 (34-00253.2) Product Manual Manual de usuario descargar pdf (Pagina 13)

Unit Configuration 7

Boot Mode

Switch S1-1 is used to determine

whether the unit configures itself from

the DIP switches or from the saved

configuration as shown in Table 2-1. If

set to boot from the saved configuration,

the switch settings are ignored. If set to boot from switches, the unit reads the DIP

switches on power up and configures the unit accordingly. Once running,

configuration changes can be made through the terminal interface, overriding the

switch settings.

DDS Mode

Switch S1-2 is used to

establish the DDS mode as

either DDS II/64 kbps or

DDS I/56 kbps as shown in

Table 2-2.

Timing Source

Positions S1-3 through S1-4 select the source of unit

clocking. Deriving timing from the network

is the most common timing source for most DDS

applications. The unit may also be clocked from an

internal standard or from the DTE as shown in

Table 2-3.

RTS-to-CTS Delay

Switch S1-5 is used to select the

delay on an RTS-to-CTS transition as

shown in Table 2-4. When the

RTS-to-CTS control option is set to

Normal, CTS follows the state of RTS

after some delay, depending on the

data rate. The delay can be selected

for a Normal or Long delay.

RTS, CTS, and DCD Handshake

Switch S1-6 is used to

determine the handshake

process as either Force On or

Normal as shown in Table 2-5.

Local and Remote Loopback Enable

Switch S1-7 is used to enable or

disable local and remote

loopbacks on the DTE interface

as shown in Table 2-6.

Table 2-1 Boot Mode

Mode S1-1

Boot from the DIP switches

Down

Boot from the saved configuration Up

Table 2-2 DDS Mode

Mode S1-2

DDS II/64 kbps

Down

DDS I/56 kbps Up

Table 2-3 Timing Source

Source S1-3 S1-4

Network

Down Down

Internal Down Up

DTE Up Down

Table 2-4 RTS-to-CTS Delay

Delay

DTE

Rate Delay S1-5

Normal

56 kbps 0.4 ± 0.02 ms Down

64 kbps 0.3 ± 0.015 ms

Long 56 kbps 0.8 ± 0.04 ms Up

64 kbps 0.6 ± 0.03 ms

Table 2-5 RTS, CTS, and DCD Handshake

Handshake S1-6

Force On

Down

Normal Up

Table 2-6 Local and Remote Looback Enable

Local and Remote Loopbacks S1-7

Disable

Down

Enable Up

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 47 48

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