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CUSTOMER

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INFORMATION

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877-877-BBOX

FREE technical support, 24 hours a day, 7 days a week: Call

724-746-5500

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Mail order:

Black Box Corporation

, 1000 Park Drive, Lawrence, PA 15055-1018

Web site:

www.blackbox.com

• E-mail:

[email protected]

JUNE 1999

MT245A
MT246A

MicroNTU G.703 Card (120 ohm)

MicroNTU G.703 Card (75 ohm)

Power

Loopback

Network

Master
Clock

Normal

MicroNTU

G.703

Содержание MicroNTU G.703 Series

Страница 1: ...rt 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 info blackbox com JUNE 19...

Страница 2: ...ment 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 whatev...

Страница 3: ...e ba 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...

Страница 4: ...i n a 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 d...

Страница 5: ...ack and Power Supplies 14 4 2 Installing the MicroNTU G 703 Card in the MicroRack Chassis 16 4 3 Connection to the G 703 Network 17 4 3 1 Twisted Pair 120 Ohm Connection MT245A 18 4 3 2 Dual Coax BNC...

Страница 6: ...ctors Terminal Rate 2 048 Mbps Diagnostics Loopback Test Indicators LEDs for power network master clock and loopback test Clocking Internal external network receive loop Fuse 400 mA for 120V applicati...

Страница 7: ...designed to mount in the MicroRack 2 4 8 or 16 RM202 RM204 RM208 RM216 These operate with a switchable 120 240 VAC power supply or optional 48 VDC power supply The power supply is included with the M...

Страница 8: ...of both may be necessary The jumpers are accessible when the cards are slid out of the rack chassis Once configured the MicroNTU G 703 Card is designed to operate transparently without need for freque...

Страница 9: ...2 Possible strap positions for jumper LK6 The setting for jumper LK6 determines whether the MicroNTU G 703 Card will provide an internal clock or will be receiving a clock from an external device LK6...

Страница 10: ...703 Card has two rear interface card options for the MT245A 120 ohm modular network and EIA 530 DB25 terminal or for the MT246A 75 ohm dual BNC network and X 21 DB15 terminal Each is configured diffe...

Страница 11: ...trap Off LK4 Clock Synchronization Strap Off LK5 DTE SGND to FGND Strap On Mandatory setting All others are up to user s discretion LK1 Transmit Pair Pin 4 to Ground Connection This setting determines...

Страница 12: ...d clocks are used for the X 21 terminal interface If clocks are synchronized a DB25 to DB15 adapter cable should be used between the MicroNTU G 703 Card and the X 21 terminal device see the Appendix f...

Страница 13: ...5 OHM 3 2 2 CONFIGURING THE 75 OHM REAR CARD The 75 ohm rear card has two configuration jumpers LK1 and LK2 Figure 3 4 shows the locations of the jumpers on the 75 ohm rear card Figure 3 4 75 ohm rear...

Страница 14: ...Ground Connection This setting determines whether or not the RX shield is connected to earth ground This connection may help EMC performance in some cases LK1 Setting Strap On RX Shield to GND Connec...

Страница 15: ...k comes with two four eight or sixteen card slots The MicroRack 16 includes its own power supply If you will be using the MicroRack 2 4 or 8 you must order a power supply see the next page for more in...

Страница 16: ...Replacing the Power Supply Fuse The rack chassis power supply uses a 400 mA fuse for 120 VAC circuits and a 200 mA fuse for 240 VAC circuits The fuse compartment is located just below the AC socket o...

Страница 17: ...roNTU G 703 Card in the MicroRack Chassis The MicroNTU G 703 Card is made up of a front card and a rear card The two cards meet inside the MicroRack chassis and plug into each other by way of mating 5...

Страница 18: ...work The MicroNTU G 703 Card supports 2 048 Mbps communication over an unstructured G 703 network Both 120 and 75 ohm interface cards are available see Figure 4 2 Figure 4 2 Rear interface card option...

Страница 19: ...Cs TX and RX for connection to a 75 ohm dual coax G 703 network interface The outer conductor of the coax cables is isolated from system earth ground 4 4 Connection to the Terminal Device The MicroNTU...

Страница 20: ...ding to the CCITT X 21 standard see the Appendix To connect to an X 21 terminal DTE use a standard DB15 cable NOTE The 120 ohm rear card can also be used with X 21 terminal devices To do this the Card...

Страница 21: ...ct with the chassis s mid plane socket or when the chassis s power supply is turned on NOTE The MicroNTU G 703 Card is a hot swappable card it will not be damaged by plugging it in or removing it whil...

Страница 22: ...21 CHAPTER 5 Operation Figure 5 1 The front panel Power Network Master Clock Loopback Normal MicroNTU G 703...

Страница 23: ...rminal will appear on the terminal screen To perform a LAL test a Activate LAL by moving the front panel toggle switch up and holding it in the Loopback mode The Loop LED should glow Once LAL is activ...

Страница 24: ...ceive Clock B 11 External Clock B 12 Transmit Clock B Transmit Data B 14 Transmit Clock A 15 Receive Data B 16 Receive Clock A 17 Data Term Ready DTR 20 External Clock A 24 CCITT X 21 INTERFACE DB15 1...

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