Verilink 2048 (34-00179) Product Manual Uživatelský manuál stáhnout pdf (Strana 9)

2-2 Installation 2048 PMU/NTU

-15 -7.5 0

The stand-alone unit may be used in a chassis installation

with the following modifications: Remove the housing as

described above and then remove the four screws holding

the front panel to the circuit boards. Replace the stand-alone

front panel with a module type front panel. The unit will

now slide into one of the 12 slots in the chassis.

2.4.2 Chassis Assembly

Up to 12 units may be inserted into a chassis and the chassis

may be installed in a 19" or 23" rack using four screws.

Connections are made from the rear of the chassis. Refer to

the figures on page 2-10 for these illustrations.

2.5 Unit Configuration

The 2048 PMU model is designed as a two card set. The

two cards roughly divide into analog and digital functions.

The unit provides an interface to the network in compliance

with established standards. It has been designed to operate

either manually or through the use of a console/terminal.

Therefore, the unit has both hardware and software configu-

ration settings.

This following paragraphs explain the various hardware

configurations that may be adjusted for unique applications.

Software controlled settings are discussed in the Operations

section of this manual.

2.5.1 Switch SW1 (BERT Pattern)

When the PMU is instructed to send a test pattern by the test

switch (FAR/LOC) on the front panel, it will send 5 seconds

of inband loop code (10000) and then transmit the test pat-

tern as determined by rotary switch SW1 (refer to the fol-

lowing table). This switch is located on the front panel

(shown on page 3-1).

PROM Downloading Procedures:

Rotary switch SW1,

position 9 is used to download new PMU operating firm-

ware into the flash memory. This operation requires a PC

and a diskette which contains TxPORT’s downloading pro-

gram (

download.exe

) and the hex file to be downloaded.

Downloading procedures are described in the 2048 Down-

load Procedures document sent with the software.

2.5.2 Switch SW2 (National Bit)

Rotary switch SW2 is used to select the National Bit. The

following table shows the switch positions. The factory

default is position 1.

Switch S6 has two positions affecting the options for Switch

SW2. For position S6-7, Down = ‘Pass’

and Up = ‘Select’.

For position S6-8, select either ‘Down’ (0) or ‘Up’ (1) for

National Bit data (applies only if position S6-7 is set for

‘Select’). Switch S6 is covered in Section 2.5.7 on page 2-4.

2.5.3 Switch S1 (Network LBO)

The output signal level of the transmit data (TXD) from the

2048 PMU to the network must be set by the LBO switch

Pos

0 12345 6 7 9

Pattern

QRW 2

1:8 3:24 PROM

Pos

2345678 9

N/A 1

23454 4 4 4

Figure 2-1 Circuit Board Views

1234567

Switch S7

8123456781234567812345678

Switch S6Switch S5Switch S4Switch SW2

2048

rear

2048

rear

Switch S1

Switch S2

NORM RACK

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 32 33

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