Black Box SM906C User manual

CUSTOMER
SUPPORT
INFORMATION
Order toll-free 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 [phone]
Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: [email protected]
JANUARY 2002
SM900A SM906C SM910C
SM901A SM907C SM911C
SM903C SM908C SM950A
SM905C SM909C SM950A-220
Pro Switching System II with
Terminal-Based Management

1
FCC AND IC RFI STATEMENTS
FEDERAL COMMUNICATIONS COMMISSION
AND
INDUSTRY CANADA
RADIO FREQUENCY INTERFERENCE STATEMENTS
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, maycause interference to radio communication. It has been tested
and found to comply with thelimits 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
operatedin a commercial environment. Operation of this equipment in a
residential area is likely tocause 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 modificationsnot expressly approved by the party responsible
for compliance could void the user’sauthority to operate the equipment.
This digital apparatus doesnot 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 publié par Industrie Canada.
EUROPEAN UNION DECLARATION OF CONFORMITY
This equipment complies with the requirements of the European EMC Directive
89/336/EEC.

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PRO SWITCHING SYSTEM II WITH TERMINAL-BASED MANAGEMENT
NORMAS OFICIALES MEXICANAS (NOM)
ELECTRICAL SAFETY STATEMENT
INSTRUCCIONES DE SEGURIDAD
1. Todas las instrucciones de seguridad y operación deberán ser leídas antes de
que el aparato eléctrico sea operado.
2. Las instrucciones de seguridad y operación deberán ser guardadas para
referencia futura.
3. Todas las advertencias en el aparato eléctrico y en sus instrucciones de
operación deben ser respetadas.
4. Todas las instrucciones de operación y uso deben ser seguidas.
5. El aparato eléctrico no deberá ser usado cerca del agua—por ejemplo, cerca
de la tina de baño, lavabo, sótano mojado o cerca de una alberca, etc..
6. El aparato eléctrico debe ser usado únicamente con carritos o pedestales que
sean recomendados por el fabricante.
7. El aparato eléctrico debe ser montado ala pared o al techo sólo como sea
recomendadopor el fabricante.
8. Servicio—El usuario no debe intentar dar servicio al equipo eléctrico más allá
a lo descrito enlas 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 colocación del aparato eléctrico sobre una cama, sofá,
alfombrao superficie similar puede bloquea la ventilación, no se debe colocar
en libreros o gabinetesque impidan el flujo de aire por los orificios de
ventilación.
10. El equipo eléctrico deber ser situado fuera del alcance de fuentes de calor
como radiadores, registros de calor, estufas u otros aparatos (incluyendo
amplificadores) que producen calor.
11. El aparato eléctrico deberá ser connectado a una fuente de poder sólo del
tipo descrito enel instructivo de operación, o como se indique en el aparato.

3
NOM STATEMENT
12. Precaución debe ser tomada de tal manera que la tierra fisica y la polarización
del equipo no sea eliminada.
13. Los cables de la fuente de poder deben ser guiados de tal manera que no
sean pisados ni pellizcados por objetos colocados sobre o contra ellos,
poniendo particular atención a los contactos y receptáculos donde salen del
aparato.
14. El equipo eléctrico debe ser limpiado únicamente de acuerdoa las
recomendaciones del fabricante.
15. En caso de existir, una antena externa deberá ser localizada lejos delas 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 el contacto ha sido dañado; u
B: Objectos han caído o líquido ha sido derramado dentro del aparato; o
C: El aparato ha sido expuesto a la lluvia; o
D: El aparato parece no operar normalmente o muestra uncambio en su
desempeño; o
E: El aparato ha sido tirado o su cubierta ha sido dañada.

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PRO SWITCHING SYSTEM II WITH TERMINAL-BASED MANAGEMENT
UL
The Pro Switching System II is UL®listed.
TRADEMARKS USED IN THIS MANUAL
UL®and Underwriters Laboratories®are registered trademarks of Underwriters
Laboratories Incorporated.
Any other trademarks mentioned in this manual are acknowledged to be the property of the
trademark owners.

5
CONTENTS
Contents
Chapter Page
1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2. Introduction . . . .. . . . . . . .. . . . . . . .. . . . . . .. . . . . . . .. . . . . . . . . . . . .11
2.1 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.1.1 Supported Data Line Interfaces . . . . .. . . . . . . . .. . . . . . .12
2.1.2 System Capabilities. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.1.3 System Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.2 Hardware Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.2.1 Chassis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.2.2 Control Converter Components . . . . . . . . . . . . . . . . . . . . . 15
2.2.3 Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.2.4 Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.3 Software Summary. . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . .. .18
3. Control and Test Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.1 LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.2 Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.3 A/B Gang Switching. . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . .19
3.4 Displays 19
3.5 Front-Panel and Schematic Illustrations . . . . . . . . . . . . . . . . . .. . . . 19
4. Circuit Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.1 LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.2 Using the A/B Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.3 Connecting to the I/A Test Bus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.4 Front-Panel and Schematic Illustrations . . . . . . . . . . . . . . . . . . . . . . 25
5. Installation 28
5.1 Mounting the Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.1.1 Site Environmental Recommendations . . . . .. . . . . . . .. . 28
5.1.2 Rack Mounting Specifications. . . . . . . . . . . . . . . . . . . . . . . 28
5.1.3 Chassis Mounting Procedure. . . . . . . . . . . . . . . . . . . . . . . . 28
5.2 Adding and Removing Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.2.1 Adding Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.2.2 Removing Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.2.3 Using Blank Panel Patch Modules . . . . . . . . . . . . . .. . . . . 30
5.3 Connecting DCE and DTE Devices . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.4 Connecting External Test Equipment. . . . . . . . . . . . . . . . . . . . . . . . 30

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PRO SWITCHING SYSTEM II WITH TERMINAL-BASED MANAGEMENT
Contents
Chapter Page
5.4.1 Non-Intrusive Monitor Connections. . . . . . . . . . . . . . . . . . 30
5.4.2 Intrusive Interactive Connections. . . . . . . . . . . . . . . . . . . . 31
5.5 Connecting to the Control Console . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.5.1 Configuring the Control Console. . . . . . . . . . . . . . . . . . . .31
5.5.2 Configuring the Control Converter . . . . . . . . . . . . . . . . . . 32
5.6 Connecting Slave Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.7 Connecting Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.7.1 Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.7.2 Power Requirements . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . 35
5.7.3 Connecting to the AC Power Source . . . . . . . . . . . . . . . . . 35
5.7.4 Performing a Lamp Test . . . . .. . . . . . . . . . . . . . . . . . . . .. 35
5.7.5 Checking Fuses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.8 Configuring the Control Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
5.8.1 Unlocking the Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.8.2 Configuration Mode Functions. . . . . . . . . . . . . . . . . . . . . . 40
5.9 Upgrading Firmware. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
6. Control Console Operations. . . . . . . . . . . . . . . . . .. . . . . . . . .. . . . . . . .. . 45
6.1 Unsolicited Status Message Reporting. . . . . . . . . . . . . . . . . . . . . . . . 45
6.1.1 Alarm Reporting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.1.2 Hardware Change Reporting . . . . . . . . . . . . . . . . . . . . . .. 45
6.2 Terminating Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.3 Defining Command Arguments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.3.1 Path Arguments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
6.3.2 Other Arguments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
6.4 Menu Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
6.4.1 Display the Command Menu. . . . . . . . . . . . . . . . . . . . . . . . 47
6.4.2 Display Command Help. . . .. . . . . . . . . . . . . . . . . . . . . . . .48
6.5 Alarm and Switch Status (A) Commands . . . . . . . . . . . . . . . . . . . . . 48
6.5.1 Display Alarm and Switch Status. . . . . . . . . . . . . . . . . . . . . 48
6.5.2 Alarm Bell On. . . . . . . .. . . . . . . . . . . . . . . . . . . . .. . . . . . . 49
6.5.3 Alarm Bell Off. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
6.5.4 Alarm On . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . 49
6.5.5 Alarm Off . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . .49
6.6 A/B Switch (B) Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
6.6.1 Display A/B Switch Sets and Positions . . . . . . . . . . . . . . . . 51
6.6.2 Switch to A . . . . . . . . . . . . . .. . . . . . . .. . . . . . . . .. . . . . .. 51

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CONTENTS
Contents
Chapter Page
6.6.3 Switch to B. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
6.6.4 Switch to Alternate A/B. . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
6.6.5 Switch to A/B Switch Set . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
6.6.6 Define A/B Switch Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
6.7 Configuration Summary (C) Commands . . . . . . . . . . . . . . . . . . . . . 53
6.8 Data Line Monitor (D) Commands. . . . . . . . . . . . . . . . . . . . . . . . . . 53
6.8.1 Display DLM Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
6.8.2 Disconnect All DLMs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
6.8.3 Connect DLM. . . . . . . . . . . . . . . . . . . . .. . . . . . . .. . . . . . .54
6.8.4 Disconnect DLM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
6.8.5 Connect High-Speed DLM . . . .. . . . . . . . . . . . . . . . . . . . . 55
6.9 Front Panel (F) Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
6.9.1 Display Front Panel Lock Status . . . . . . . . . . . . . . . . . . . . . 56
6.9.2 Lock Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
6.9.3 Unlock Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
6.10 Interactive (I) Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
6.10.1 Display Interactive Connect Status . . . . . . . . . . . . . . . . . . . 56
6.10.2 Connect Interactive Test Bus to Monitor Ports . .. . . . . . . 57
6.10.3 Disconnect Interactive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
6.10.4 DisconnectAll Interactives . . . . . . . . . . . . . . .. . . . . . . . . . 58
6.10.5 Connect Bridge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
6.10.6 Connect Equipment A . . . . .. . . . . . . . . . . . . . . . . . . . . . . .58
6.10.7 Connect Equipment B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
6.10.8 Connect Modem (Common) . . . . . . . . . . . . . . . . . . . . . . . 59
6.11 Lead Status Display (L) Commands . . . . . . . . . . . . . . . . . . . . . . . . . 60
6.11.1 Lead Status Display On . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
6.11.2 Lead Status Display Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
6.12 Path Set (P) Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
6.13 Quiet Mode (Q) Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
6.13.1 QuietMode Off . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 62
6.13.2 Quiet Mode On with Retention . . . . . . . . . . . . . . . . . . . . .63
6.13.3 Quiet Mode On without Retention. . . . . . . . . . . . . . . . . . . 63
6.14 Clock (R) Commands. . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 64
6.14.1 Read Clock . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . 64
6.14.2 Set Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
6.15 Alarm Edit Mode (S) Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
6.16 Transmit ASCII (T) Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
6.16.1 Display ASCII Mode and Speed . . . . . . . . . . . . . . . . . . . . . 65

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6.16.2 Enable ASCII Always Mode . . . . . . . . . . . . . . . . . . . . . . . . . 65
6.16.3 Enable ASCII Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . 66
6.16.4 Transmit ASCII On . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . .66
6.16.5 Transmit ASCII Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
6.16.6 Set Aux Speed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
6.17 Execute Command Sequence (X) Commands . . . . . . . . .. . . . . .. 68
6.17.1 Display Sequences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
6.17.2 Execute Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
6.17.3 Clear Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
6.17.4 Define Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
7. Alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
7.1 Alarm Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
7.2 Set Alarm Parameters—Line Summary Mode . . . . . . . . . . . . . . . . . 76
7.2.1 Add New Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
7.2.2 Edit Alarm. . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . 76
7.2.3 Delete Alarm. . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . 76
7.2.4 Clear ID. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
7.2.5 Set ID. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
7.2.6 Select Line for Alarm Editing . . . . . . . . . . . . . . . . . . . . . . . 77
7.3 Set Alarm Parameters—Alarm Summary Mode. . . . . . . . . . . . . . . .78
7.3.1 Change Auto Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
7.3.2 Disable Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
7.3.3 Enable Alarm . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . 79
7.3.4 Select Auto Switch Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
7.3.5 Set Time to Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
7.3.6 Set Time to Clear . . . . . . . . . . . . . . . . . . . .. . . . . . . .. . . . . 80
7.3.7 Set Alarm for Positive or Data/Clock Activity . . . . . . . . . . 80
7.3.8 Set Alarm for Negative or No Data/Clock Activity . . . . . . 81
7.4 Alarms and the Interlock Feature . . . . . . . . . . . . . . . . . . .. . . . . . . . 82
7.5 Alarms and Inter-Rack Groups. . . . . . . . . . . . . . . . . . .. . . . . . .. . . . 83
8. Data Communication Interfaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
8.1 Data Line Interfaces and Patch Cavities . . . . . . . . . . . . . . . . . . . . . . 84
8.1.1 RS-232 Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
8.1.2 RS-530 Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
8.1.3 V.35 Pinouts . . .. . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . 88
8.1.4 X.21 Pinouts . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . .. . . . . 90

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8.2 Control Interfaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
8.3 Test Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
8.3.1 I/A Test Port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
8.3.2 Monitor Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .103
9. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .107
9.1 Calling Black Box . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . .107
9.2 Shipping and Packaging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .107
10. Glossary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

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PRO SWITCHING SYSTEM II WITH TERMINAL-BASED MANAGEMENT
1. Specifications
Standards: FCC Part 15 Class A;EN 50081, 50082,and 60950; UL®1950; CE
Control Signals: Send Data, Receive Data, Serial Clock Transmit, Serial Clock
Receive, Request to Send, Data Terminal Ready, Data Carrier Detect, Data Set
Ready
Data Format: 8-bit data, 1 stop bit, no parity
Interface: SM903C: RS-232 (DB25); SM905C: RS-232/V.24 (DB25); SM906C: RS-
530-422 (DB25); SM907C: V.35 (M/34): SM908C: RS-530 (DB25); SM909C: X.21
(DB15); SM910C: Blank card cover; SM911C: Blank power supply cover
Connectors: SM900A: (48) DB25 female, (3) per circuit; (2) DB25 female for
monitor; (1) DB25 female for I/A test; (1) DB25 female for control in/out;
SM901A: (48) M/34 female,(3) per circuit; (2) DB25 female for monitor;(1)
DB25 female for I/A test; (1) DB25 female for control in/out
Indicators: SM903C, SM905C: SD, RD, RTS, CTS, DSR, CD, SCT, SCR, DTR, RI,
SCTE; SM906C–SM908C: SD, RD, CD, DTR, RTS; SM909C: T, R, I, C, S
Protocols: Transparent to all protocols
Control Interface: Any ASCII-capable terminal or PC
System Capacity: (1) control/test module per chassis; (16) circuit modules per
chassis
Signal Activity Indicators: (1) set of LEDs per control/test module; (1) set of LEDs
per circuit module
Operating Environment’s Relative Humidity: 10 to 80%, noncondensing
Power: SM950A: 110 VAC input; SM950A-220: 220 VAC input; Both models:
(2) power supplies (redundant); AC Fusing: Two fuses: 0.5 amp at 115 VAC; One
fuse: 0.25 amp at 220 VAC; One fuse: 0.16 amp at 220 VAC; Frequency: 50/60 Hz;
Receptacle: 3-prong, grounding; Energy Rate: 50 VA
Size: SM900A, SM901A: 7"H (4 Rack Units) x 19"W x 14"D (17.8 x 48.3 x 35.6 cm)
Loaded Weight: SM900A (DB25 connectors): 29 lb. (13.2 kg); SM901A (V.35
connectors): 39 lb. (17.7 kg)

11
CHAPTER 2: Introduction
2. Introduction
2.1 Overview
The Pro Switching System II is a series of rackmount modular components used
for managing EIA RS-232/V.24, V.35, X.21, and RS-530 data interfaces.
The main component of thesystem is a Rack Chassis for either RS-232 (part
number SM900A) or V.35 (part number SM901A). Each Rack Chassis fits in a
standard 19" equipment rack.
Two powersupplies of the same voltage (part number SM950A for 110-VAC
operation, or part number SM950A-220 for 220-VACoperation) fit into the
leftmost slot of the the Rack Chassis when viewed from the front (one on the top,
one on the bottom). (A primary power supply is standard; a secondary supply is
optional.) If thesecondary supply is installed, failure of either supply will cause a
console alarm.
A Control Module goes into the second slot onthe Chassis (when viewed from the
left front). The module can be remotelycontrolled by a single management
console (an ASCII terminal). Install just one Control Module per chassis. There
are two models to choose from forterminal-based management: SM903C for
RS-232, SM905C for V.35.
The remaining 16 slots canbe filled with your choice of Front Interface Cards (ISP
modules). Available models include SM906C for RS-232, SM907C for V.35,
SM908C for RS-530, or SM909C for X.21. The Front Interface Cards (ISPs) are
installed between Data Terminal Equipment (DTE) and Data Communications
Equipment (DCE) and provide patching, A/B switching (single or multiple
channels,single or multiple racks), interactive test and data monitor access, circuit
statusdisplay, and alarm definition/detection/reaction.

12
PRO SWITCHING SYSTEM II WITH TERMINAL-BASED MANAGEMENT
Product Code Product Name/Description
SM900A Pro Switching System II Chassis RS-232, RS-530, X.21, V.35
SM901A Pro Switching System II Chassis V.35 Only
SM903C Terminal Display Card RS-232 Only
SM905C Terminal Display Card V.35, RS-530, X.21
SM906C Front Interface Card RS-232
SM907C Front Interface Card V.35
SM908C Front Interface Card RS-530
SM909C Front Interface Card X.21
SM910C Blank Cover for Unused Slot (Interface)
SM911C Blank Cover for Unused Slot (Power Supply)
SM950A Power Supply Module 110-VAC
SM950A-220 Power Supply Module 220-VAC
2.1.1 S UPPORTED D ATA L INE I NTERFACES
The chassissupports the following data line interfaces:
• RS-232/V.24 (DB25)
• RS-530/422 (DB25)
• V.35 (DB25 or M/34)
• X.21 (DB15)
2.1.2 S YSTEM C APABILITIES
Depending upon the configuration, the system can provide:
• Data line patching
• Data line A/B switching for single lines, multiple lines, single chassis, and/or
multiple chassis
• Intrusive interactive data line test access
• Non-intrusive monitor data line test access
• Data line circuit status displays
• Data line alarm definition, detection, and reaction
• Master/Slave chassis control hierarchies

13
2.1.3 S YSTEM A RCHITECTURE
There are up to three active buses connecting the control module with the circuit
modules within a chassis: control, monitor, or I/A test bus.
Control Bus
The control bus system transports commands and responses. External control
signals are passed through the Control In/Out port.
Monitor Bus
The monitor bus transports non-intrusive monitor information in TTL format
from a specified circuit module to the control module. It also converts the TTL
formatto either RS-232 or V.35 signal levels (regardless of its original interface)
before delivery to the rear-mounted “Monitor” ports.
I/A Test Bus
The I/A (interactive) test bus transports information either directly from a
specified circuit module to the rear-mounted I/A test port or to the control
moduleand then to the rear-mounted “Monitor”ports.
NOTE
The signal levels output from the I/A bus depend upon the type of circuit
and the destination port.
2.2 Hardware Summary
2.2.1 C HASSIS
Each chassis contains front-access slots that support up to one control/testmodule,
16 circuit (line) modules, and two power-supply modules
The left-most full-length slot in the chassis is the only position that supports a
control or test module.
A control/test module connects to some or all of the following rear-chassis ports
(DB25 connectors): Control In/Out, Monitor (two available), and/or I/ATest
(see Figure 2-2 on the next page).
Circuitmodules are numbered from left to right, 1–16 inclusive. The patch cavity
rowsare labeled on theright mounting ear. Each open line module (EQP A, EQP
B, or MODEM) patch cavitycorresponds to a rear-chassis port of thesame name
and number.Figure 2-1 illustrates the module-numbering convention.

14
PRO SWITCHING SYSTEM II WITH TERMINAL-BASED MANAGEMENT
Figure 2-1. Module-numbering scheme.
Power jackson the rear of all chassis include one AC and oneAux DC In (for
future use).
Data line ports on the rear ofthe chassis can be in the following configurations:
• DB25 female/female
• M/34 female/female
For illustrations of some of the reardata-line port configurations,see Figures 2-2
and 2-3.
Figure 2-2. Rear chassis for RS-232, RS-530, or V.35 DB25 (female/female).

15
CHAPTER 2: Introduction
Figure 2-3. Rear chassis for V.35 M/34 (female/female).

16
PRO SWITCHING SYSTEM II WITH TERMINAL-BASED MANAGEMENT
2.2.2 C ONTROL C ONVERTER C OMPONENTS
Control converter kits facilitate:
• A control connection between therear-chassis Control In/Out port and the
controlling console.
• The cabling of multi-chassis control hierarchies.
See Figures 2-4 through 2-7 for illustrations of the control converter components.
Figure 2-4. Control converter for chassis with DB25 data-line ports.

17
Figure 2-5. Control converter for chassis with M/34 data-line ports.
Figure 2-6. RJ-45 male to RJ-45 male cable.
Figure 2-7. DB25 male to RJ-45 control adapter.
CHAPTER 2: Introduction
6 feet (1.8 m)

18
PRO SWITCHING SYSTEM II WITH TERMINAL-BASED MANAGEMENT
2.2.3 M ODULES
Each chassis supports up to one control/test module and up to 16 circuit (line)
modules.All modules are insertedfrom the front of the chassis. For a module’s
functional schematic and a description of each module’s front panel, seeChapters
3and 4.
2.2.4 P OWER S UPPLIES
The two redundant powersuppliesprovide DC voltage power tothe chassis. They
are front-loaded and comewith a 6-foot (1.8-m) power cord. Two AC power supply
versionsare available, one for 110-volt input and onefor 220-volt input. When both
LEDs are lit, the unit is functioning correctly.
Figure 2-8. Power supply front panel.
2.3 Software Summary
Firmware can be upgraded withthe replacement of the PROM on the control/test
module.
The remote control of achassis is performed via any ASCII-capable terminaleither
through a direct or modem connection.A master chassis can also be configured to
facilitatethe control of multiple slave chassis.

19
3. Control and Test Modules
Controland test module topics includeLEDs, test points, A/B gang switching,
displays, and front-panel and schematic illustrations.
3.1 LEDs
Control/test modules contain LEDs that indicate signal activity for any data line
patched from a circuit module to acontrol/test module Monitor cavity.
3.2 Test Points
Adjacent to the signal LEDs are voltage test points. Unbalanced signals have a
single point per signal, while balanced signals have dualpoints per signal. Positive
test voltage (+12 VDC) and signal ground points are also provided.
3.3 A/B Gang Switching
Use theA/B Gang Switchbutton to switch all circuitmodules to the alternative
A/B position. The switchbutton must be pressed and held for two seconds before
switching takes place.This prevents inadvertent operation.
The A/B gang switch function can also be operated by a control console command
(control modules only).
CAUTION
Control/test modules are designed to work with circuit modules of the
same interface type. If the interface types of the modules are different,
the LEDs may not report correctly and the signal nomenclature may be
inaccurate.
3.4 Displays
The upper display normally shows the address of the chassis. In configuration
mode, both the upper and the lower displays are used in conjunction with the “A”
and “B” buttons for configuration tasks.
3.5 Front-Panel and Schematic Illustrations
All schematic drawings in this section are shown without connections to the patch
cavities. See Figures3-1 through 3-7.
CHAPTER 3: Control and Test Modules