CTC Union MUX128 Operating instructions

Brand: CTC Union

Model: MUX128

Type: Operating instructions

INSTALLATION

and

OPERATION MANUAL

Table of Contents

Chapter 1: Introduction

1.1 General …………………………………………………. 1

1.2 Data Port Interfaces ……………………………………. 2

1.3 G.703/64K Interface …………………………………… 3

1.4 Features ………………………………………………… 6

1.5 Specifications ………………………………………...… 6

1.6 Loop Back Diagnostics ………………………………… 7

1.7 Timing Considerations …………………………………. 7

Chapter 2: Installation and Operation

2.1 General …………………………………………………. 9

2.2 Site Preparation ………………………………………… 9

2.3 Mechanical Assembly ………………………………….. 9

2.4 Electrical Installation …………………………………... 9

2.5 Dip Switch and Jumper Settings ………………….……. 11

2.6 Front Panel ……………………………………………... 13

2.7 Loop Back Operation …………………………………... 13

2.8 Auto Delay Feature …………………………………….. 16

Chapter 3: Optional Rack Mounting ………………... 17

Appendix A: DIP Switch Setting Tables …………..... 19

A.1 DSW1 Setting (Clock Source Setup) ……………….…. 19

A.2 DSW2 Setting (Data Port Setup) ……………………… 20

A.3 DSW3 Setting (Delay Setup) ………………………….. 21

Table of Contents

Appendix B: Cable Pin Out Definition Tables ……. 23

B.1 DB9 Connectors ……………………………………….. 23

B.2 User Data Port Connector for RS-232 ……………….… 24

B.3 User Data Port Connector for RS-530 …………………. 25

B.4 User Data Port Connector for V.35 ………………….… 26

B.5 User Data Port Connector for X.21 ………………….… 27

B.6 User Data Port Connector for RS-449 ……………….… 28

B.7 User Data Port Connector for V.36 ……………………. 29

Chapter 1: Introduction

1.1 General

The MUX128/2*64 Access Unit is used to multiplex two

G.703/64Kbps bit flows to one 128K Synchronous Data Port

or vice versa.

Referring to the Point-to-Point example below, no

additional bandwidth is available for synchronization.

Therefore, it is important that the transmission delay between

the two units be less than half of a 64Kbps cycle.

Figure 1-1: Point to point connection diagram

The delay between A CH 64K and B CH 64K should be

the same. Any delay may be manually nulled via DIP switch

settings. The delay may also be automatically detected while

in “Auto Delay” mode for automatic nulling. In either case,

for normal operation, the delay between channels must remain

fixed after setting.

Figure 1-2: Multiplex/De-multiplex Timing Diagram

1 2 3 4 5 6 7 8 9

1 3 5 7

2 4 6 8

128Kbps

data

A CH

B CH

64Kbps

Chapter 1: Introduction

To achieve proper operation, the timeslot assignment of

transmit and receive sides must be the same and sequential,

otherwise, the multiplex and de-multiplex feature will not

work reliably.

Figure 1-3: Typical Application of MUX128/2*64

1.2 Data Port Interfaces

The data port of the MUX128/2*64 is DCE and runs at a

fixed rate of 128Kbps in synchronous mode only. At the

receiving side, the incoming data is split equally, bit-for-bit, to

the A and B channels of the G.703/64K interfaces. When

receiving data from the G.703 channels, the data is

recombined to form the outputted 128Kbps stream.

There are 6 interface standards supported by the Data Port.

They are RS-530, RS-449, X.21, V.35, RS-232 and V.36.

The output connector for the Data Port is a standard DB25F

connector. Interface selection is provided by a combination of

DIP switch settings and physical adapter cables. For exact

DIP switch settings and cabling information, please refer to

Appendices A and B respectively.

Chapter 1: Introduction

1.3 G.703/64K Interface

The G.703 Interfaces used in the MUX128/2*64 have a

through rate of 64Kbps each and operate in co-directional

mode only. The following will describe co-directional

operation in more detail.

Co-directional

The term co-directional is used to describe an interface

across which the information and its associated timing signal

are transmitted in the same direction (see Figure 1-4).

Figure 1-4: Co-directional interface

This mode is the most popular for point-to-point

applications. All timing modes (recovery, transparent, data

port or internal oscillator) are possible in this mode.

Equipment

Data signal

Timing signal

Equipment

Chapter 1: Introduction

G.703 Co-directional Code Conversion Rules

Figure 1-5: G.703 Co-directional Code Conversion Rules Illustration

Step 1: A 64Kbps period is divided into four unit intervals.

Step 2: A binary “one” is coded as a block of four bits “1100”.

Step 3: A binary “zero” is coded as a block of four bits “1010”.

Step 4: The binary signal is converted into a three-level signal.

Step 5: A “Violation” block marks the last bit in an octet.

The next page displays a figure showing the boundaries for

the standard pulse signals for proper operation and

compatibility with other G.703 equipment.

0 1

3 4 5

0 10

Octet timing

Step 4

Steps 1 - 3

Bit number

Violation Violation

Chapter 1: Introduction

Figure 1-6: Pulse Masks for the 64Kbps co-directional interface.

3,12

(3,9 – 0,78)

3,51 s

(3,9 – 0,39)

3,9 s

4,29

(3,9 + 2,6)

6,5

(3,9 + 0,39)

7,8

(3,9 + 3,9)

0,5

1,0

7,02

(7,8 – 0,78)

7,41

(7,8 – 0,39)

7,8 s

8,19

(7,8 + 2,6)

10,4

(7,8 + 0,39)

11,7

(7,8 + 3,9)

1,0

0,5

a)Mask for single pulse

b)Mask for double pulse

Chapter 1: Introduction

1.4 Features

Primary G.703 Link

l 2 channels (2x64Kbps)

l Interface: 64Kbps G.703 co-directional

Synchronous mode Data Port interface

l 1 channel DCE-128Kbps: RS-530, RS-449, X.21, V.35, RS-232,

or V.36 Data Port

l DSR constantly ON except in test

l DCD constantly ON

l Data port Loop back (Loop back to DTE)

l Self testing function

1-5 Specifications

G.703 Interface Specifications

l Type: Co-directional 64Kbps

l Line: 4 wires 0.5~0.7mm

l Impedance: 120 Ω (Balanced)

l Clock frequency: 64KHz ±100ppm

l Complies with: ITU G.703 and G.823 (jitter)

l Frame format: unframed only

l Line code: 64Kbps co-directional line code

l Connector: DB9/F (proprietary)

User Data Interface Specifications

l Interface Types: RS530, RS-449, X.21, V.35, RS-232 and V.36

l Data rate: 128Kbps SYNC

l Connector: DB25/F plus adapter cables

Chapter 1: Introduction

1.6 Loop back Diagnostics

The MUX128/2*64 features V.54 diagnostic capabilities

for performing local loopback and BERT testing. The

operator at either end of the G.703 lines may test the

MUX128/2*64 in the digital loopback mode. The loopback

function is controlled by push-button switches, located on the

MUX128/2*64 front panel.

When the “Test” push-button is activated, the unit

generates a 511 test pattern, according to ITU, for direct end-

to-end integrity testing. The Error indicator flashes for each

bit error detected. Operation is described in Chapter 2.

1.7 Timing Considerations

Multiple clock source selection provides maximum

flexibility in connecting both the G.703/64K link and user data

interface. The G.703/64K link may be clocked from the

recovered receive clock, from the user data port or from the

internal oscillator.

The MUX128/2*64 has the flexibility to meet the timing

requirements of various system configurations. The timing

mode for the G.703/64K link and the user channel, is selected

by DIP switch setting.

Chapter 1: Introduction

E1 link timing

The MUX128/2*64 G.703/64K link receive path always

operates on the receive clock. The MUX128/2*64 recovers

the receive clock from the received link data signal. The

source of the MUX128/2*64 link transmit clock may be

selected by the user. The following four transmit timing

modes are available.

• Recovery timing:

The MUX128/2*64 G.703 link transmit clock is locked to

the recovered receive clock. This is usually the timing mode

selected for network operation.

• Internal timing:

The MUX128/2*64 G.703 link transmit clock is derived

from the internal clock oscillator. This timing mode is

necessary in point-to-point applications over leased lines. In

this case, one MUX128/2*64 must use the internal oscillator,

and the other must operate from the recovered clock.

• Transparent timing:

The MUX128/2*64 synchronous data channel accepts the

recovered G.703 clock and provides the G.703 transmit clock

from the DCE (Transparent timing).

• External timing:

The ETU-01A E1 link transmit clock is locked to the

clock signal provided by the user DCE connected to the data

channel.

Chapter 2: Installation and Operation

2.1 General

This chapter provides detailed instructions for mechanical

installation and operation of the MUX128/2*64.

2.2 Site Preparation

Install the MUX128/2*64 within reach of an easily

accessible grounded AC outlet. The outlet should be capable

of furnishing 90 ~ 250 VAC. Allow at least 10 cm (4 inch)

clearance at the rear of the MUX128/2*64 for signal lines and

interface cables.

2.3 Mechanical Assembly

The MUX128/2*64 is designed for tabletop, bench, or

optional rack mount installation, and is delivered completely

assembled. No provision has been made for bolting the

MUX128/2*64 to a tabletop. Rack mounting instructions are

provided in Chapter 3.

2.4 Electrical Installation

2.4.1 Power connection

AC power is supplied to the MUX128/2*64 through a

standard 3-prong IEC connector. (Refer to Figure 2-1) The

MUX128/2*64 should always be grounded through the

protective earth lead of the power cable. The power supply

within the MUX128/2*64 is a switching power type, designed

to operate from any AC voltage, 90 to 250 volts.

Chapter 2: Installation and Operation

Figure 2-1: MUX128/2*64 back panel

The line fuse is located in an integral-type fuse holder on

the rear panel. Make sure that only fuses of the required rating

are used for replacement. Do not use repaired fuses or short-

circuit the fuse holder. Always disconnect the power cable

before removing or replacing the fuse.

2.4.2 Rear panel connectors

The MUX128/2*64’s CH-128 DB25F connector, in

combination with various DIP switch settings and adapter

cables, provides for six interface types (RS-530, RS-449,

X.21, V.35, RS-232 and V.36). The G.703/64K line

connectors incorporate DB9F connectors. (Appendix B

provides detailed pin out information on the various interface

connectors).

IEC Connector and

fuse holder

Data Port

Connector

G.703/64K

Connectors

Chapter 2: Installation and Operation

2.5 DIP Switches and Jumper Settings

2.5.1. Caution

To avoid accidental electrical shock, disconnect the

MUX128/2*64 power cord prior to opening the cover.

2.5.2. Procedure

a. Turn power OFF. Disconnect the power cord from the AC

outlet.

b. Loosen the thumb screws at the left/right of the rear panel.

c. Remove the PCB assembly.

d. Adjust the DIP switches and jumper as required, according to

the tables in Appendix A.

e. Replace the PCB and tighten the screws.

Referring to the following figure, three DIP switches are

used for configuration and are labeled DSW1 to DSW3. If a

DIP switch configuration is changed while the MUX128/2*64

is in a powered on state, the effect will not be realized until

the unit is power cycled off then on.

The Logic Ground Jumper will connect (CON) or

disconnect (DIS) the MUX128/2*64 logic ground from

chassis ground. Chassis ground is connected directly to the

ground post of the IEC power connector.

Chapter 2: Installation and Operation

Figure 2-2: MUX128/2*64 Printed Circuit Board Diagram

CH-128 Data PortG.703/64K (x2)

Loop Back Test Sws.Indicator LEDs

DSW1

DSW2

DSW3

Logic Ground Jumper

Chapter 2: Installation and Operation

2.6 Front Panel

The front panel of the MUX128/2*64 provides user access

to the diagnostic loop back push-button switches as well as a

visual reference of activity via LED display.

Figure 2-3: MUX128/2*64 front panel layout

Label Color Description

PWR

green Lights when unit is powered on.

yellow Flashes when data is transmitted from the 128K data port.

yellow Flashes when data is received at the 128K data port.

RTS

yellow Lights when the connected DTE equipment supplies RTS.

DCD

yellow Normally, should be lit during operation.

yellow Flashes when G.703 A-channel transmits data.

yellow Flashes when G.703 A-channel receives data.

yellow Flashes when G.703 B-channel transmits data.

yellow Flashes when G.703 B-channel receives data.

Err

red Indicates error in BERT or slip in A-B channel delay.

Test

red Lights when any push-button switch is selected.

Table 2-1: Indicator LED descriptions

2.7 Loop Back Operation

The loop back test buttons and LED indicators built into

the MUX128/2*64 allow for rapid checking of the data

terminal, MUX128/2*64 and the G.703/64K lines. Before

testing the operation of the data system equipment and line

circuits, please ensure that all units are turned on and are

configured correctly.

Chapter 2: Installation and Operation

Bit Error Rate Tester

When the “Test” push-button is depressed, the internal

pattern generator and pattern tester will be activated and a

511 test pattern will be transmitted out the 64K co-directional

lines. The “Test” LED will light. Referring to figure 2-4, if the

remote MUX128/2*64 unit also has its “Test” push-button

switch depressed, its internal pattern generator and tester will

be activated and its signal will be received by the local unit. In

this configuration, both units and the lines are tested. Both

units will have their “Test” LEDs lit and “Err” LEDs should

be off.

Figure 2-4: Back-to-back BERT testing

Referring to figure 2-5, if the remote MUX128/2*64 unit

is placed into loop back by placing its “Loc ana loopbk”

switch in the depressed position, the 511 pattern will be

returned to the local unit and tested. This will test the local

unit and lines. If there are no errors, the “Err” LEDs should be

off.

Chapter 2: Installation and Operation

Figure 2-5: Remote loop back test

In the next example (refer to figure 2-6), a Datacom BERT

tester, such as the HCT-6000 is connected to the

MUX128/2*64 data port. The MUX128/2*64 is placed in

DTE loop back mode by depressing the "DTE loopbk” push-

button switch. This will enable testing of the data port

interface.

Figure 2-6: Data Port BERT

Chapter 2: Installation and Operation

2.8 Auto Delay

A feature of the MUX128/2*64 is the auto delay function.

If the two G.703/64K Co-directional signals arrive out of time

at the receivers, the 128K data stream cannot be properly re-

assembled. The delay between channels may be nulled by

manually setting DIP switch 3 or by performing the auto delay

function.

In order to perform auto delay, there must be someone at

each end of the link (refer to figure 2-7).

Figure 2-7: Null Delay Feature

At the local and remote sites, depress the “Test” switches.

Then depress the “Auto Delay” switches on each unit. When

the “Err” LEDs go out, release the “Auto Delay” switches.

The delay both ways has been calculated and saved in each

unit. Now release the “Test” switches. The delay settings have

been saved in EEPROM and are read whenever the unit is

powered up. There is no need to re-calibrate unless the

environment is changed.

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CTC Union MUX128 Operating instructions

CTC Union MUX128 Operating instructions

CTC Union MUX128 Operating instructions

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