Black Box V.35 FOLD-ST Series Manual de usuario

CUSTOMER

SUPPORT

INFORMATION

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FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746

Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018

Web site: www.blackbox.com • E-mail: [email protected]

FEBRUARY 1998

ME522A-ST

ME522AE-ST

ME522A-SM

ME522AE-SM

V.35 FOLD—ST

V.35 FOLD—SM

V.35 FOLD

RTS CD TD RD PWR

DLB TEST

V.35 FOLD

FEDERAL COMMUNICATIONS COMMISSION

AND

INDUSTRY CANADA

RADIO FREQUENCY INTERFERENCE STATEMENT

This equipment generates, uses, and can radiate radio frequency energy

and if not installed and used properly, that is, in strict accordance with the

manufacturer’s instructions, may cause interference to radio communication.

It has been tested and found to comply with the limits for a Class A

computing device in accordance with the specifications in Subpart B of

Part 15 of FCC Rules, which are designed to provide reasonable protection

against such interference when the equipment is operated in a commercial

environment. Operation of this equipment in a residential area is likely to

cause interference, in which case the user at his own expense will be required

to take whatever measures may be required to correct the interference.

Changes or modifications not expressly approved by the party responsible

for compliance could void the user’s authority to operate the equipment.

This digital apparatus does not exceed the Class A limits for Radio noise emission from

digital apparatus set out in the Radio Interference Regulation of Industry Canada

Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites

applicables aux appareils numériques de la classe A prescrites dans le Règlement sur le

brouillage radioélectrique édicté par Industrie Canada.

TRADEMARKS

ST®is a registered trademark of AT&T.

Any other trademarks mentioned in this manual are acknowledged to be the property

of the trademark owners.

V.35 FOLD

1. Specifications .....................................................................................4

2. Introduction........................................................................................6

3. Installation and Configuration .......................................................7

3.1 Opening the V.35 FOLD ............................................................7

3.2 Speed ...........................................................................................7

3.3 Transmit Data Clock...................................................................9

3.4 Carrier—Constant/Switched .....................................................9

3.5 RTS/CTS Delay.........................................................................10

3.6 Full or Half-Duplex Operation ................................................11

3.7 Final Installation Procedures ...................................................11

4. Monitoring Operation ....................................................................12

5. Diagnostics and Troubleshooting.................................................13

5.1 Simple Problems .......................................................................13

5.2 Diagnostic Tests ........................................................................13

5.3 Troubleshooting .......................................................................14

6. Fiberoptic Considerations .............................................................15

6.1 Link Distance ............................................................................15

6.2 Handling Fiber Optic Cable.....................................................15

Appendix A: V.35 Pin Assignments........................................................16

Appendix B: Tail-Circuit Applications ..................................................17

Contents

V.35 FOLD

Speed — 2.4 to 256 Kbps

Interface —

Terminal: V.35 DCE

Line: Multimode fiberoptic, graded index

Pins Supported —

V.35: CTS, DCD, DSR, ETCA, ETCB, FG, RCA, RCB,

RDA, RDB, RTS, SG, TCA, TCB, TDA, TDB

Fiberoptic: TX, RX

Range — 2.3 km (1.4 miles) with 100µ, -5dB/km fiber

optic cable;

1.5 km (0.9 miles) with 62.5µ , -5dB/km fiber

optic cable;

Connectors — (2) fiberoptic: SMA (905) female or ST

female;

(1) DB25S (25-pin sub D female) pinned per

EIA530A. A DB25-to-V.35 (female M-block)

adapter cable is included.

Fiber Optic Characteristics:

Wavelength — 820nM

Receiver Sensitivity — -21.7dB

Launch Power — -10.1 dB into 100µ cable

(typical) -14.1 dB into 62.5µ cable

-19.6 dB into 50µ cable

Operation — Point-to-point

Mode — Full or half-duplex; synchronous

Clocking — Internal, external, or recovered

Carrier — Constant or Switched

1. Specifications

V.35 FOLD

Loopback — Digital

RTS/CTS Delay — 0, 11, 50, or 175 ms

Protocol — Transparent

Indicators — 5 LEDs (TX, RX, RTS, CD, and PWR)

Diagnostics — DLB and Test Pattern Generator

Operating Temperature — 32° to 122°F (0° to 50°C)

Storage Temperature — -4° to 158°F (-20° to 70°C)

Humidity — 15 to 90% relative humidity, noncondensing

Mean Time

Between Failures — approximately 100,000 hours

Power — Wallmount transformer 115-VAC, 60 Hz, 8VA

or 230-VAC, 50 Hz, 8VA

Size —

Standalone: 1.8" H x 5.5"W x 8.5"D

(4.6 cm x 14.0 cm x 21.6 cm);

Rackmount: 4.7"W x 7.4"D (11.9 x 18.8 cm)

Weight —

Standalone: 1.5 lb. (0.7 kg);

Unit and transformer: 2.2 lb. (1.0 kg);

Rackmount: 0.5 lb. (0.2 kg)

V.35 FOLD

The V.35 FOLD (Fiber Optic Line

Driver) provides short-haul

synchronous data communication

over your own fiberoptic cable in a

point-to-point application. You must

use these units in pairs.

The FOLD is equipped with two

rear-panel adapters, either SMA

or ST®.

The FOLD has two fiberoptic ports

and a V.35 port (configured as DCE)

that connects to a host computer or

terminal (DTE).

Transmission can be half- or full-

duplex. The switch-selectable baud

rates range from 2400 to 256,000 bps.

LEDs on the front panel indicate

flow control. TX, RX, and RTS

indicate data activity on the V.35

interface only. CD indicates that

there is a carrier signal on the RX

fiberoptic connector.

Two pushbuttons on the front panel

(TST and DLB) make diagnostics

easy to use.

Internal switches or jumpers

determine these characteristics:

• Speed

• Carrier: constant or switched

with selectable RTS/CTS delay

• Operation: full- or half-duplex

• TX data clock select

Your FOLD package should include:

• the base unit with attached A/C

cord and power transformer,

• a DB25-to-V.35 adapter, and

• this manual.

If any of these items are missing,

check with your sales or technical

representative to get replacements.

2. Introduction

Mainframe

Fiberoptic Cable

Controller

V.35 FOLDV.35 FOLD

V.35

Cable

(EYN450)

V.35

Cable

(EYN450)

Figure 1. The V.35 FOLD is designed for a point-to-point application.

V.35 FOLD

3.1 Opening the V.35 FOLD

1. Remove the screw located at the

center of the bottom cover.

2. Remove the top cover.

3.2 Speed

The ten standard available speeds

are: 2.4, 4.8, 9.6, 19.2, 38.4, 56, 64,

112, 128, and 256 Kbps. The factory

setting is 56 Kbps.

Set the speed of the V.35 FOLD by

configuring DIP Switch banks S4 and

S5. See Figure 2 for switch-bank

locations. See Table 1 for how to set

the switches.

NOTE: Off in Table 1 corresponds to Open

on DIP switches S4 and S5.

If you are resetting the speed switch

banks after the V.35 FOLD has been

on, the heat sinks nearby might be

quite warm. This is normal because

of power dissipated in V.35

transmission.

Important

Both V.35 devices and both

V.35 FOLDs must be set to

the same speed.

3. Installation and Configuration

Table 1. DIP Bank Speed Settings

Bank Switch Speed (in Kbps)

2.4 4.8 9.6 19.2 38.4 56 64 112 128 256

4 1 On On On On Off Off Off Off Off Off

4 2 Off On On Off Off Off Off Off Off Off

4 3 Off On Off Off Off Off Off Off Off Off

4 4 On Off Off Off Off Off Off Off Off Off

5 1 On On On On On On On Off Off Off

5 2 Off Off Off Off Off Off Off On On On

5 3 On Off Off Off Off On On Off Off Off

5 4 On On On On On Off Off Off Off Off

5 5 On On On On On On On On On Off

5 6 On Off Off Off Off On Off On Off On

5 7 On On On On On On On On On On

5 8 On On On On On On On On On Off

V.35 FOLD

ABCDE

OPEN

1234

HALF FULL

OPEN

1234

12345678

Figure 2. Circuit Board Layout for the V.35 FOLD.

V.35 FOLD

3.3 Transmit Data Clock

Data timing is synchronized among

all connected devices in one of three

ways:

• Internal Clock (factory setting)

• Recovered Clock

• External Clock

DIP switch S3 controls the selection

of the clock timing. See Table 2 for

DIP switch settings. The fourth

switch position on DIP switch S3 is

unused. Figure 2 shows where the

DIP switch is located on the ciruit

board.

NTERNAL

LOCK

The FOLD generates Transmit Data

clock and presents clock to the

attached DTE on TCA and TCB. The

DTE then presents synchronized

data to the FOLD on pins TDA and

TDB.

ECOVERED

LOCK

The Transmit data clock presented

to the DTE is synchronized with the

timing of data received from the

remote device.

XTERNAL

LOCK

The local DTE determines clocking.

The clock is presented to the FOLD

on Pins ETCA and ETCB, and

returned as TCA and TCB.

ASTER

LOCK

To create a master clock, one of the

FOLDs should be set to internal or

external clocking and the other

FOLD set to recovered clock.

3.4 Carrier—Constant/Switched

Jumper W2 is used to select Constant

Carrier or Switched Mode. See

Figure 2 for the jumper’s location on

the printed circuit board. This

option determines how the FOLD

reacts to an RTS signal from the

local V.35 device. The FOLD is

defaulted to Contant Carrier Mode.

ONSTANT

ARRIER

ODE

Place jumper W2 over position E.

The FOLD functions as if the

attached V.35 device is constantly

asserting RTS:

• The fiberoptic transmitter is

always on, and the FOLD’s CTS

signal remains high. Any data

sent by the attached V.35 device

is automatically transmitted by

the FOLD.

• The RTS indicator on the

FOLD’s front panel will always

be on, regardless of the data

activity on the V.35 interface.

The CD indicator on the remote

FOLD will remain lit.

Table 2. Clock Settings

Data Clock Switch

1234

Recovered On Off Off On

Internal Off On Off On

External Off Off On On

V.35 FOLD

Warning

Constant Carrier Mode will work

with full-duplex operation only,

not half-duplex. In Constant

Carrier mode the RTS signal is

constantly held high, preventing

any other signals from being

raised in the sequential fashion

required by half-duplex operation.

WITCHED

ODE

Set the jumper block over one of the

four RTS/CTS delay positions. See

3.5 RTS/CTS Delay.

The FOLD transmitter is not

activated until the attached V.35

device asserts RTS. (Unlike Constant

Carrier Mode, this mode does not

always hold RTS high.)

When the attached V.35 device raises

RTS, the RTS indicator on the local

FOLD will light. The remote FOLD’s

CD indicator will also light,

indicating that a transmission link

has been established.

Once the local V.35 device drops

RTS, the local RTS and remote CD

indicators will go out.

3.5 RTS/CTS Delay

In Switched mode, you may insert a

delay after the V.35 device raises

RTS. This will delay the return of

CTS from the FOLD to the V.35

device.

This feature is useful in applications

that require time for the remote

V.35 device to prepare to receive

data. The local V.35 device should

not attempt data transmission

without sensing CTS.

In half-duplex operation, the

RTS/CTS delay is useful because it

allows time to establish which FOLD

will have control of the line in order

to transmit data.

RTS/CTS Delay Options

(Jumper W2):

Position D: 0 msec (no delay)

Position C: 11-msec delay

(factory setting)

Position B: 50-msec delay

Position A: 175-msec delay

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