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20

MINIATURE LOCAL MUX-12

4. Operation

4.1 General

This chapter contains a list of the Mux-12’s indicators,
their functions and operating procedures. Installation
procedures given in 

Chapter 3

must be completed and

checked before attempting to operate the Mux.

4.2 Indicators

Four indicators are located on the Mux’s top panel (see

Figure 4-1

). Their functions are described in 

Table 4-1

.

Table 4-1. Indicator functions.

Indicator

Function

Power

ON when unit is powered

Test

ON when remote Mux is performing a loopback

Local Sync Loss

ON when synchronization is lost at the local unit

Remote Sync Loss

ON when synchronization is lost at the remote unit

4.3 Operating Procedure

4.3.1 P

OWERING

O

N THE

U

NIT

To power on the Mux, connect the power cable to the
Mux’s jack, then plug the power supply unit into the
mains. The POWER indicator should light. If the link to

Summary of Contents for MX873A

Page 1: ...77 877 BBOX outside U S call 724 746 5500 FREE technical support 24 hours a day 7 days a week Call 724 746 5500 or fax 724 746 0746 Mailing address Black Box Corporation 1000 Park Drive Lawrence PA 15...

Page 2: ...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 m...

Page 3: ...o lavabo s tano mojado o cerca de una alberca etc 6 El aparato el ctrico debe ser usado nicamente con carritos o pedestales que sean recomendados por el fabricante 7 El aparato el ctrico debe ser mont...

Page 4: ...los contactos y recept culos donde salen del aparato 14 El equipo el ctrico debe ser limpiado nicamente de acuerdo a las recomendaciones del fabricante 15 En caso de existir una antena externa deber...

Page 5: ...4 MINIATURE LOCAL MUX 12 TRADEMARKS USED IN THIS MANUAL Any trademarks mentioned in this manual are acknowledged to be the property of the trademark owners...

Page 6: ...1 1 Sub Channels 7 1 2 Main Channel 8 1 3 General 8 2 Introduction 10 2 1 General 10 2 2 Functional Description 10 2 3 Applications 11 3 Installation 14 3 1 General 14 3 2 Physical Installation 14 3...

Page 7: ...20 4 2 Indicators 20 4 3 Operating Procedure 20 4 3 1 Powering On the Unit 20 4 3 2 Operation 21 4 3 3 Powering Off the Unit 21 4 4 Operational Field Strapping Changes 21 5 Diagnostics 22 5 1 Remote...

Page 8: ...232 CCITT V 24 Connectors 12 RJ 45 female Number of Sub channels 12 Distortion See Table 1 1 User may select six sub channel operation for reduced distortion by internal strapping Table 1 1 Performan...

Page 9: ...utput Format Balanced bipolar transformer isolated Output Level 6 V ptp on 100 ohms Input Resistance 110 ohms Connectors 1 RJ 45 female 1 3 General Indicators Power Local Sync Loss Remote Sync Loss Ta...

Page 10: ...ATURE LOCAL MUX 12 Temperature 32 to 122 F 0 to 50 C Humidity Up to 95 noncondensing Power Consumption Input 110 VAC Output 200 mA 9 VDC Size 1 3 H x 4 5 W x 7 4 D 3 4 x 11 4 x 18 7 cm Weight 10 7 oz...

Page 11: ...Description The Mux 12 has 12 sub channels that are connected by RJ 45 connectors accessible from the top panel The unit can be strapped for 6 or 12 sub channels according to the desired application...

Page 12: ...rates Sub channel Distortion Distortion bit rate kbps 6 channel mode 12 channel mode 19 2 12 5 25 9 6 6 3 12 5 4 8 3 2 6 3 2 4 1 6 3 2 1 2 0 8 1 6 2 3 Applications The primary application of the Mux 1...

Page 13: ...Mux 12 units may be installed in a ring type configuration as shown in Figure 2 2 At each site the unconnected channels must be bypassed by shorting TX pin to RX pin of the relevant sub channel s conn...

Page 14: ...13 MINIATURE LOCAL MUX 12 Figure 2 2 Typical ring installation Host Terminals Terminals Miniature Local Mux 12 Miniature Local Mux 12 Miniature Local Mux 12...

Page 15: ...o assure normal operation 3 2 Physical Installation The Mux 12 comes completely assembled and is designed to be secured to a bench or wall using screws 3 3 Site Preparation The Mux 12 is installed wit...

Page 16: ...through the mounting brackets located at both sides of the unit 5 Connect 9 to 12 VDC from a wall mounted AC adapter into the DC jack of the Mux The POWER LED should be lit Other LEDs may be lit as we...

Page 17: ...of 9 to 12 VDC capable of supplying at least 300 mA A miniature wall mount power supply can be used to provide the required power The power supply is connected to the Mux by a cable ending with a mini...

Page 18: ...ar to Send Connected to RTS 107 CC 6 Data Set Ready A positive level from the Mux except when either a sync loss occurs or remote loopback is performed 109 CF 4 Receive Line A positive level Signal De...

Page 19: ...18 MINIATURE LOCAL MUX 12 Figure 3 1 RJ 45 socket female external view 1 8...

Page 20: ...19 MINIATURE LOCAL MUX 12 Figure 3 2 RJ 45 plug male clip at rear 1 8...

Page 21: ...e Figure 4 1 Their functions are described in Table 4 1 Table 4 1 Indicator functions Indicator Function Power ON when unit is powered Test ON when remote Mux is performing a loopback Local Sync Loss...

Page 22: ...ly unattended except when occasional monitoring of LED indicators is required 4 3 3 POWERING OFF THE UNIT To power off the Mux simply remove the power adapter from the AC source 4 4 Operational Field...

Page 23: ...ngle port Mux s digital circuitry as well as both local and remote analog interfaces the main channel link and the Mux 12 s digital receiver section NOTE When either local or remote loopback test is p...

Page 24: ...l front panel a Check that power is supplied to the unit indicators are off b Replace unit The fault is probably in the unit s power supply circuits Local SYNC LOSS and or a Check the main channel s c...

Page 25: ...ch end of the Mux case 2 Each bracket has a pair of flanges that slide into the Mux case slots Figure A 1 Top view of mounting bracket 3 To attach the brackets hold the Mux case facing upward Slide th...

Page 26: ...25 MINIATURE LOCAL MUX 12 Figure A 2 Before mounting the brackets Figure A 3 After mounting the brackets...

Page 27: ...1000 Park Drive Lawrence PA 15055 1018 724 746 5500 Fax 724 746 0746 Copyright 1998 Black Box Corporation All rights reserved...

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