Verilink PRISM 4151 (34-00258) Product Manual Instrukcja Użytkownika Pobierz pdf (Strona 13)

Configuration 3-1PRISM 4151

3. Configuration

The PRISM 4151 can be configured through manual switch

settings and/or through a VT100 terminal connection to the

supervisory port.

All default options in this manual are underlined

Hardware Configuration

Hardware configuration is set using two dual in-line pack-

age (DIP) switches located on the rear of the unit. These

switches allow you to configure simple applications. Refer

to Figure 3-6 for switch locations. A removable configura-

tion guide (45-00105) is included in the back of this manual.

Switch S1

Switch S1 (Figure 3-7) configures the antistream timer,

V.54 loop, circuit assurance, and loop mode.

Antistream Timer:

Switch S1-1 allows the DDS transmit-

ter to send DMI (Data Mode Idle / all ones) if the RTS

remains enabled long enough for a timeout to occur.

Choices are Off (Dn)

or 30 seconds (Up).

V.54 Loop:

Switch S1-2 enables (Dn)

or disables (Up) the

unit’s ability to respond to incoming V.54 loop/unloop code.

If set to enable, the PRISM 4151 will loop or unloop. If set

to disable, loop codes are ignored.

Circuit Assurance:

Switch S1-3 configures the CTS/RTS

sequence. When Circuit Assurance is disabled (Dn)

, CTS

follows RTS. When enabled (Up), CTS follows RTS if DCD

is also enabled (or set to On).

Loop Mode:

Switch S1-4 determines the loop direction for

the transmit and receive data as either bidirectional (Dn)

unidirection (Up). Refer to page 4-1 for more information

concerning the loop modes and with respect to testing.

Switch S2

Switch S2 (Figure 3-8) configures the boot mode, DDS

mode, timing source, CTS delay, RTS, CTS, DCD hand-

shake, remote/local loopback, and DTR alarm.

Boot Mode

: Switch S2-1 determines whether the unit con-

figures itself from the DIP switches or from the saved soft-

ware configuration. If set to boot from saved software

configuration (Up), the switch settings are ignored. If set to

boot from switches (Dn)

, the unit reads the DIP switches on

power-up and configures accordingly. Once running, config-

uration changes can be made through the terminal interface,

overriding the switch settings.

DDS Mode:

Switch S2-2 establishes the DDS mode as

either DDS II/64 kbps (Dn)

or DDS I/56 kbps (Up).

Timing Source

: Switch S2-3 and S2-4 determine the unit

clocking source. The most common timing source for CSU/

DSU applications is the network. The PRISM 4151 may

also be optioned to time from an internal standard or from

the high speed data interface as shown in Table 3-H.

SUPVSLIPLAN

NET

V.35

115 VAC

60 HZ

S2 S1

Figure 3-6 PRISM 4151 Rear Panel

7654321 8

V.54 Loop

Circuit Assurance

Loop Mode

Switch

Antistream Timer

Not Used

Figure 3-7 Switch S1

7654321 8

DDS Mode

Timing

Remote/Local

DTR Alarm

Loopback

CTS Delay

Source

Dn Up

RTS, CTS, DCD

Handshake

Switch

Figure 3-8 Switch S2

Boot Mode

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 39 40

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