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10

MICRO T1 CSU/DSU

2.3.1 A

S AN

I

NTERFACE

B

ETWEEN THE

T

ELCO AND

CPE

The Micro T1 CSU/DSU provides the interface between the telephone company
and customer equipment (such as a router or switch).

2.3.2 A

S A

H

IGH

-S

PEED

S

HORT

-R

ANGE

M

ODEM

The Micro T1 CSU/DSU can also be installed in high-speed campus applications.
In this application, a pair of Micro T1 CSU/DSUs operate as short-range modems.

Bridge/Router

Bridge/Router

Micro T1 CSU/DSU

1.544 Mbps

or nx56/64

1.544 Mbps

or nx56/64

Micro T1 CSU/DSU

LAN

LAN

Micro T1 CSU/DSU

LAN

Router

T1 Network

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Summary of Contents for Micro T1 CSU

Page 1: ...ree in the U S Call 877 877 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 15055 1018 Web site www blackbox com E mail info blackbox com ...

Page 2: ...is manual are acknowledged to be the property of the trademark owners CE Notice The CE symbol on your Micro T1 CSU DSU indicates that it is in compliance with the Electromagnetic Compatibility EMC directive and the Low Voltage Directive LVD of the Union European EU WARNING This device is not intended to be connected to the public telephone network ...

Page 3: ...ommercial 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 necessary 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 apparatu...

Page 4: ...ato eléctrico debe ser montado a la pared o al techo sólo como sea recomendado por el fabricante 8 Servicio El usuario no debe intentar dar servicio al equipo eléctrico más allá a lo descrito en las instrucciones de operación Todo otro servicio deberá ser referido a personal de servicio calificado 9 El aparato eléctrico debe ser situado de tal manera que su posición no interfiera su uso La colocac...

Page 5: ...ir una antena externa deberá ser localizada lejos de las lineas de energia 16 El cable de corriente deberá ser desconectado del cuando el equipo no sea usado por un largo periodo de tiempo 17 Cuidado debe ser tomado de tal manera que objectos liquidos no sean derramados sobre la cubierta u orificios de ventilación 18 Servicio por personal calificado deberá ser provisto cuando A El cable de poder o...

Page 6: ...equipment is connected to their lines inform them of a The telephone number that this unit is connected to b The ringer equivalence number c The USOC jack required RJ 11C d The FCC registration number Items b and d can be found on the unit s FCC label The ringer equivalence number REN is used to determine how many devices can be connected to your telephone line In most areas the sum of the RENs of...

Page 7: ...ations Repairs to certified equipment should be made by an authorized Canadian maintenance facility in this case your supplier Any repairs or alterations made by the user to this equipment or equipment malfunctions may give the telecommunications company cause to request the user to disconnect the equipment Users should ensure for their own protection that the electrical ground connections of the ...

Page 8: ...the Telco and CPE 10 2 3 2 As a High Speed Short Range Modem 10 3 Configuration 11 4 Installation 18 4 1 DTE Interface Connection 18 4 2 Network Interface Connection 18 4 3 Power Connection 18 5 Operation 19 5 1 LED Descriptions 19 5 2 Central Office Loops 20 Appendix A Cable Recommendations 22 Appendix B Pin Assignments 23 Appendix C Power Supply Interface 24 ...

Page 9: ...Selectable 0 7 5 15 or 22 5 dB Clock Options Internal external and network clock Diagnostics Responds to CO initiated D4 loop up and loop down codes ESF line loop and payload loop FDL messages universal loopback de activate message Standards AT T TR62411 ANSI T1 403 TR54016 Power Supply 120 VAC 60 Hz to 5 VDC 300 mA wallmount transformer for DTE power options see Appendix C Size 0 8 H x 2 1 W x 4 ...

Page 10: ... using additional cables Twisted pair line connections are made through a modular RJ 48 female jack on the rear of the unit Seven easy to read LED indicators monitor data network and test signals 2 2 Features Operates over 4 wire T1 DS1 circuits Supports unstructured rates at 1 544 Mbps Supports common framed n 56 64 rates up to 1 536 mbps Seven easy to read LEDs monitor data and diagnostics Inter...

Page 11: ... as a router or switch 2 3 2 AS A HIGH SPEED SHORT RANGE MODEM The Micro T1 CSU DSU can also be installed in high speed campus applications In this application a pair of Micro T1 CSU DSUs operate as short range modems Bridge Router Bridge Router Micro T1 CSU DSU 1 544 Mbps or nx56 64 1 544 Mbps or nx56 64 Micro T1 CSU DSU LAN LAN Micro T1 CSU DSU LAN Router T1 Network ...

Page 12: ...rameters using the DIP switch packages on the bottom of the printed circuit board see Figure 3 1 or via software using the RS 232 control port Figure 3 1 Bottom view showing the DIP switches Figure 3 2 shows the orientation of the DIP switches with respect to ON OFF positions Figure 3 2 Closeup of DIP switches SW1 SW2 ON OFF DIP Switches SW2 and SW1 ...

Page 13: ...f SW1 7 Data Rate On 1 536 Mbps SW1 8 Data Rate On DTE Rate SW2 1 Clock Off Network SW2 2 DS0 Rate Clock On 64 kbps SW2 3 Frame Off ESF SW2 4 Line Code Off B8ZS SW2 5 Line Build Out Off SW2 6 Line Build Out Off 0 dB In unframed mode SW2 2 is used with SW2 1 to determine the clocking mode In framed modes ESF or D4 only network and internal clocking are available In unframed mode where the DTE data ...

Page 14: ...kbps n 5 Off On On Off Off 336 384 kbps n 6 On On On Off Off 392 448 kbps n 7 Off Off Off On Off 448 512 kbps n 8 On Off Off On Off 504 576 kbps n 9 Off On Off On Off 560 640 kbps n 10 On On Off On Off 616 704 kbps n 11 Off Off On On Off 672 768 kbps n 12 On Off On On Off 728 832 kbps n 13 Off On On On Off 784 896 kbps n 14 On On On On Off 840 960 kbps n 15 Off Off Off Off On 896 1024 kbps n 16 On...

Page 15: ...switch setting is invalid Refer to Section 5 1 for a more detailed explanation of the ERR LED function Table 3 4 T1 Starting Channel SW1 1 SW1 2 SW1 3 SW2 7 SW2 8 T1 Starting Channel maximum value of n Off Off Off Off Off 1 24 Off Off Off On Off 2 23 Off Off Off Off On 3 22 Off Off Off On On 4 21 On Off Off Off Off 5 20 On Off Off On Off 6 19 On Off Off Off On 7 18 On Off Off On On 8 17 Off On Off...

Page 16: ...DSU transmits data as a sequence of ones and zeros Ones are usually sent as pulses and zeros as spaces no pulse In order to maximize transmission range every pulse is of the opposite polarity of the preceding pulse AMI does nothing else Maintaining network integrity requires a minimum pulse density ones density of the signal being transmitted on the network AMI does not inherently provide for this...

Page 17: ...s specified in AT T TR62411 is the standard in which twelve frames make up a superframe All signaling and synchronization is done in band Extended Superframe Extended Superframe as specified in AT T TR 54016 consists of 24 T1 frames The framing bits are now used for framing CRC and the Facility Data Link FDL The FDL allows maintenance messages and information to be passed between the CSU DSU and t...

Page 18: ...Clocking Mode Framed Mode Off Don t Care Network ESF D4 On Don t Care Internal Unframed Mode Off Don t Care Network On Off Internal On On External NOTE When using the Micro T1 CSU DSU to terminate the telephone company s T1 service the Micro T1 CSU DSU must be set to network clock When using the CSU DSU as a high speed short range modem one unit of the link must be configured for Internal Clock mo...

Page 19: ...ular RJ 48C jack This interface will need to be configured to match the line parameters that is framing and line coding supplied by the Central Office NOTE If the Micro T1 CSU DSU is being used for private short range modem applications the twisted pair cable connected to its port will need to be a crossover cable See Appendix B for interface pin assignments 4 3 Power Connection The Micro T1 CSU D...

Page 20: ...nfiguration You might request more bandwidth than is possible For instance if you set the starting channel to 12 and you select a number of timeslots exceeding 13 the unit will not be able to satisfy your request In that case the ERR LED will flash once a second 1 2 second on 1 2 second off When the unit detects an invalid setting it will ignore the setting and default to a full T1 bandwidth 24 ch...

Page 21: ...d to indicate a network Loss of Frame or Loss of Signal condition ALM Alarm Lit red to indicate that one of several alarm conditions exists These conditions may be local alarms or remote alarm conditions Alarms may occur due to Loss of Synchronization Loss of Frame AIS Blue Alarm or Yellow Alarm ERR Error Lit red to indicate the detection of an Errored Second ES An Errored Second is any second in ...

Page 22: ... loop down command is implemented by the pattern 100 in the data stream for a minimum of 5 seconds When operating in ESF framing mode loopback commands are issued via the Facility Data Link FDL The line loop message will cause a loopback before data enters the framer portion of the CSU The payload loop message will cause the Micro T1 CSU DSU to loop data after the framer portion of the CSU The Mic...

Page 23: ... pf ft 0 05165 ohms ft For optimum performance Always use twisted pair wire this is not an option Use twisted pair wire with a capacitance of 20 pF ft or less Avoid twisted pair wire thinner than 26 AWG avoid higher AWG numbers than 26 Use of twisted pair with a resistance greater than the specifications above may cause a reduction in maximum distance obtainable Functionality should not be affecte...

Page 24: ...NG 4 TX Data TIP 5 TX Data RING M 34 Connector Terminal Interface Pin Signal A GND Earth Ground Shield B SGND Signal Ground C RTS D CTS E DSR F CD H DTR P TD R RD S TD T RD U XTC Transmit Clock DTE Source V RC DCE Source W XTC Transmit Clock DTE Source X RC Y TC AA TC KK Aux Power Input 5 VDC 300 mA APPENDIX B Pin Assignments ...

Page 25: ...Power Supply Interface Main 5 VDC power jack J1 Center Pin 5 VDC 300 mA Outer Barrel Ground Auxiliary Power Supplied to Pin KK on V 35 connector Jumper Position for Power via DC Power Jack Default Jumper Position for Power via Pin KK ...

Page 26: ...1000 Park Drive Lawrence PA 15055 1018 724 746 5500 Fax 724 746 0746 Copyright 1999 Black Box Corporation All rights reserved ...

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