Black Box IC945A 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]
MAY 1998
IC945A
IC946A
V.35↔HSSI Interface Converters
V.35 to HSSI
Interface Converter

1
FCC STATEMENT
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, may cause interference to radio communication. It has been tested
and found to comply with the limits 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
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 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 apparatus does not 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.

2
V.35↔HSSI INTERFACE CONVERTERS
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 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 colocación del aparato eléctrico sobre una cama, sofá,
alfombra o superficie similar puede bloquea la ventilación, no se debe colocar
en libreros o gabinetes que 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 en el 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 acuerdo a las
recomendaciones del fabricante.
15. En caso de existir, 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 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 un cambio en su
desempeño; o
E: El aparato ha sido tirado o su cubierta ha sido dañada.

4
V.35↔HSSI INTERFACE CONVERTERS
CE Notice
The CE symbol on this equipment indicates that it is in compliance with the
Electromagnetic Compatibility (EMC) directive and the Low Voltage
Directive (LVD) of the Union European (EU).
TRADEMARKS USED IN THIS MANUAL
Any trademarks mentioned in this manual are acknowledged to be the property of the
trademark owners.

5
TABLE OF CONTENTS
Contents
Chapter Page
1. Specifications..................................................................................................6
2. Introduction ...................................................................................................7
2.1 Description .............................................................................................7
2.2 Features ..................................................................................................7
3. Configuration.................................................................................................8
3.1 Configuration Switches in the IC946A .................................................9
3.2 Configuration Switches in the IC945A ...............................................12
4. Installation....................................................................................................15
4.1 IC946A ..................................................................................................15
4.2 IC945A ..................................................................................................15
4.3 AC Power Connection .........................................................................16
4.4 DC Power Connection.........................................................................16
5. Operation .....................................................................................................17
5.1 Back-Panel LEDs ..................................................................................17
5.2 Test Modes ...........................................................................................17
5.2.1 Local Loopback (LL) .................................................................19
5.2.2 Remote Digital Loopback (RL) .................................................19
Appendix A: Pinouts........................................................................................21
Appendix B: Block Diagrams..........................................................................24

6
V.35↔HSSI INTERFACE CONVERTERS
1. Specifications
Data Rate— Up to 10 Mbps
Protocol— Synchronous
Standards— CCITT V.35; HSSI (ANSI/TIA/EIA-613)
Interfaces— IC945A: Connects V.35 (DCE) to HSSI (DTE);
IC946A: Connects V.35 (DTE) to HSSI (DCE)
Connectors— (1) HD50 Slimline male; (1) M/34 male
Loopbacks— Local and Remote
Clocking— All HSSI co-directional timing patterns are
supported
Cable— 6 feet (1.8 m)
Compliance— FCC Class A, IEC CE (emissions)
Approval— CE (EMC Directive/EN 50082-1)
Temperature Range— 32 to 122°F (0 to 50°C)
Humidity Range— 5 to 95%, noncondensing
Max. Altitude— Up to 15,000 feet (4572 m)
Power— Unit will require an external desktop power supply
100–240 VAC
Size— 0.8"H x 1.8"W x 3"D (2 x 4.6 x 7.6 cm)

7
CHAPTER 2: Introduction
2. Introduction
2.1 Description
The V.35↔HSSI Interface Converter allows an HSSI (HD50) device to
communicate bi-directionally with a V.35 device at synchronous data rates up
to 10 Mbps. The Converter supports all HSSI co-directional timing patterns, 2
loopback modes (local and remote line), full-duplex data, and control signals.
The Converter is available in two versions. The Model IC946A lets a V.35 DTE
device communicate with an HSSI DCE device. The IC945A lets a V.35 DCE
device communicate with an HSSI DTE device.
Both versions are equipped with a male M/34 connector on the converter
end and a male HD50 on the end of a 6-foot (1.8-m) cable. Power is supplied
to the Converter by an external desktop AC transformer.
2.2 Features
• Bi-directionally converts V.35 to HSSI.
• Supports synchronous data rates up to 10 Mbps.
• Transparent to synchronous protocol.
• M/34 and HD50 connectors with integral 6-foot (1.8-m) cable.
• Internal synchronization circuit enables high-speed connections.
• Externally AC powered.

8
V.35↔HSSI INTERFACE CONVERTERS
3. Configuration
To use the Converter, you must first configure the unit for your application.
To do so, first open the case by inserting a flat-head screwdriver into an open
slot on either side of the case, as in Figure 3-1.
Figure 3-1. Use a small screwdriver to open the case.
Twist the screwdriver head slightly and the top half of the case will separate
from the lower half. You now have access to the internal switches used to
configure the unit.
After opening the case, please refer to Section 3.1 if you purchased the
IC946A and Section 3.2 if you purchased the IC945A.
To close the case, fit the 2 halves together snugly and snap them back in
place.

9
CHAPTER 3: Configuration
3.1 Configuration Switches in the IC946A
The IC946A uses a mini DIP switch that may be used to configure the unit to
connect synchronous V.35 DTE equipment to synchronous HSSI DCE
equipment. Each interface converter is factory-configured as DCE on the V.35
end, and DTE on the HSSI end. Therefore, the V.35 end “wants” to connect
to DTE and the HSSI end “wants” to connect to DCE.
Please follow the instructions in this section to configure the internal DIP
switches so that the unit will work properly in your application. Figure 3-2
shows the position of Switch S1 on the top side of the PC board.
Figure 3-2. The IC946A.
Switch S1

10
V.35↔HSSI INTERFACE CONVERTERS
Figure 3-3 shows the orientation of the switches on DIP Switch S1 with respect
to ON/OFF positions. The default settings for DIP Switch S1 are shown in
Table 3-1. Detailed descriptions of each switch follow the table.
Figure 3-3. Closeup of the DIP switches.
Table 3-1. DIP-switch summary
Position Function Factory Default
S1-1 Clock Source On HSSI ST
S1-2 Clock Source Off Signal
S1-3 Sync Method Off Bypass
S1-4 Sync Method On Sync Circuit
1 2 3 4
ON
OFF
ON

11
CHAPTER 3: Configuration
Switches S1-1 and S1-2: Clock Source
The setting for Switches S1-1 and S1-2 determines the source of the HSSI
Terminal Timing (TT). With Switch S1-1 On and S1-2 Off, the IC946A derives
the HSSI Terminal Timing from the ST signal provided by the HSSI DCE.
With Switch S1-1 Off, and S1-2 On, the V.35 DTE provides TT to the HSSI
DCE.
S1-1 S1-2 Description
Off Off Not a Valid Setting
Off On Terminal Timing Supplied by V.35 DTE device
On Off Terminal Timing supplied by HSSI ST signal
On On Not a Valid Setting
Switches S1-3 and S1-4: Synchronization Method
Switches S1-3 and S1-4 allow the IC946A to compensate for timing delays
when transmitting HSSI data at high speeds (greater than 2.5 Mbps). At high
bit rates, set Switch S1-3 On and Switch S1-4 Off. In this setting, the V.35 data
will be synchronized to the SD timing signal before conversion to HSSI. At
lower bit rates (less than 2.5 Mbps), set Switch S1-3 Off and S1-4 On. In this
setting, the V.35 data bypasses the synchronization circuit and is passed
straight through to the HSSI DCE.
S1-3 S1-4 Description
Off Off Not a Valid Setting
Off On Data Skips Sync Circuit
On Off Data passes through sync circuit.
On On Not a Valid Setting

12
V.35↔HSSI INTERFACE CONVERTERS
3.2 Configuration Switches in the IC945A
The IC945A uses a mini DIP switch that may be used to configure the unit to
connect synchronous V.35 DCE equipment to synchronous HSSI DTE
equipment. Each interface converter is factory-configured as DTE on the V.35
end, and DCE on the HSSI end. Therefore, the V.35 end “wants” to connect
to DCE and the HSSI end “wants” to connect to DTE.
Please follow the instructions in this section to configure the internal DIP
switches so that the unit will work properly in your application. Figure 3-4
shows the position of Switch S1 on the top side of the PC board.
Figure 3-4. The IC945A.
Figure 3-5 shows the orientation of the Switches on DIP Switch S1 with respect
to ON/OFF positions. The default settings for DIP switch S1 are shown in the
Table 3-2. Detailed descriptions of each switch follow the table.
Figure 3-5. Closeup of the DIP switches.
1 2 3 4
ON
OFF
ON
Switch S1

13
CHAPTER 3: Configuration
Table 3-2. DIP-switch summary
Position Function Factory Default
S1-1 Gapped Clock On No Gapped
S1-2 Gapped Clock Off Clock
S1-3 Sync Method Off Bypass
S1-4 Sync Method On Sync Circuit
Switches S1-1 and S1-2: Gapped Clock
Switches S1-1 and S1-2 allow the IC945A to generate a HSSI gapped clock.
Gapped clocking is a method of flow control in which data flow is interrupted
by an idle (gapped) clock signal. In this mode, the IC945A will gap the ST
clock to the HSSI DTE whenever the V.35 CTS signal is de-asserted. In the
“No Gapped Clock” setting, the V.35 clock passes through with only a level
change.
S1-1 S1-2 Description
Off Off Not a Valid Setting
Off On Gapped Clock
On Off No Gapped Clock
On On Not a Valid Setting

14
V.35↔HSSI INTERFACE CONVERTERS
Switches S1-3 and S1-4: Synchronization Method
Switches S1-3 and S1-4 allow the IC945A to compensate for timing delays
when transmitting HSSI data at high speeds (greater than 2.5 Mbps). At high
bit rates, set Switch S1-3 On and Switch S1-4 Off. In this setting, the V.35 data
signals will be synchronized to the SD timing signal before conversion to
HSSI. At lower bit rates (less than 2.5 Mbps), set Switch S1-3 Off and S1-4 On.
In this setting, the V.35 data bypasses the synchronization circuit and is passed
straight through to the HSSI DTE.
S1-3 S1-4 Description
Off Off Not a Valid Setting
Off On Data Skips Sync Circuit
On Off Data passes through sync circuit.
Off Off Not a Valid Setting

15
CHAPTER 4: Installation
4. Installation
4.1 IC946A
The IC946A is designed to connect a V.35 DTE device to an HSSI DCE device.
In this application, the M/34 (V.35) and HD50 (HSSI) male connectors of
the IC946A may connect directly to their respective equipment ports, or they
may connect via a short “straight-through” cable (see Appendix A for
interface pin assignments). Figure 4-1 illustrates the proper connection of the
IC946A.
Figure 4-1. A common V.35 DTE to HSSI DCE installation.
4.2 IC945A
The IC945A is designed to connect a V.35 DCE device to an HSSI DTE device.
In this application, the M/34 (V.35) and HD50 (HSSI) male connectors of
the IC945A may connect directly to their respective equipment ports, or they
may connect via a short “straight-through” cable (see Appendix A for
interface pin assignments). Figure 4-2 illustrates the proper connection of the
IC945A.
T1/E1 Router with
V.35 Interface (DTE) T1/E1 CSU/DSU with
HSSI Interface (DCE)

16
V.35↔HSSI INTERFACE CONVERTERS
Figure 4-2. A common HSSI DTE to V.35 DCE installation.
4.3 AC Power Connection
The V.35↔HSSI Interface Converter uses a 5-VDC, 2A universal-input power
supply that is equipped with a male IEC-320 power-entry connector and
supports a voltage range of 100 to 240 VAC. This transformer connects to the
V.35↔HSSI Interface Converter by means of a cannon jack on the rear panel.
You’ll need to supply a power cord for the power entry. The V.35↔HSSI
Interface Converter is powered-up as soon as it is plugged into an AC outlet—
there is no power switch.
4.4 DC Power Connection
You may bypass the DC wall adapter and supply DC power directly to the
V.35↔HSSI Interface Converter power-supply jack. DC power supplied must
be 5 VDC ±5%, 1A minimum, center positive, and can be supplied via a barrel
type plug with 2.1/5.5/10 mm I.D./O.D./Shaft Length dimensions.
NOTE
DC power source must be SELV (Circuit, Safety Extra Low Voltage)
specified. (See CENELEC EN60950, Section 1.2.8.5)
Router with HSSI
Interface (DTE) T1/T3 DSU with V.35
Interface (DCE)

17
CHAPTER 5: Operation
5. Operation
Once you’ve configured the Converter properly (Chapter 3) and have
correctly connected DTE, DCE, and power (Chapter 4), you’re ready to
operate the Converter.
5.1 Back-Panel LEDs
The Converter has two LEDs on the back panel (see Figure 5-1).
Figure 5-1. The rear panel.
Status Lit green to show that both DTR (from the DTE device) and
DSR (from the DCE device) are active. This LED will not light
whenever one of the two signals is inactive.
Test Mode Lit red to show that either one or both of the test modes is
active (See Section 5.2 for a description of the test modes).
Test Mode LED
Status LED
HSSI Cable
External Power Jack

18
V.35↔HSSI INTERFACE CONVERTERS
5.2 Test Modes
The V.35↔HSSI Interface Converter supports two loopback modes that may
be used to evaluate the condition of the communication links. These modes,
Local Loopback (LL) and Remote Loopback (RL), are always initiated by the
signals on the DTE device (see Figure 5-2).
NOTE
HSSI supports a third loopback mode: Local Digital Loopback (LDL).
However, V.35 does not support this mode.
Figure 5-2. Local and remote loopback modes.
DTE
LL
V.35↔HSSI Interface Converter
RL
DCE DCE

19
CHAPTER 5: Operation
5.2.1 L OCAL
L OOPBACK (LL)
The Local Loopback (LL) test checks the performance of the link between
the DTE device and the DCE. Any data sent to the Converter from the DTE in
this test mode will be sent to the local DCE and will then be echoed
(returned) back to the DTE (the Converter simply converts and passes the
data to the the local DCE, which must perform the loopback). To perform an
LL test:
A. Verify that the data terminal equipment is operating properly and can
be used for a test. If a fault is indicated, call a technician or replace the
unit.
B. Activate LL from the DTE device. This may be done either by raising pin
L (if the V.35 device is DTE), or by activating Local Loopback from the
HSSI Interface (if the HSSI device is the DTE). The “test” LED should
be lit.
C. Perform a BER (bit error rate) test from the DTE. If the test indicates no
fault, deactivate LL and proceed as normal.
5.2.2 R
EMOTE D IGITAL
L OOPBACK (RL)
The Remote Loopback (RL) test checks the performance of the link between
the DTE device and the DCE as well as the link between the local and remote
DCE devices. Any characters sent from the DTE in this test mode will be sent
to the local DCE, which will send the data to the remote DCE. The remote
DCE should return the data back through the entire communication link and
finally, to the DTE. To perform an RL test:
A. Activate RL from the DTE device. This may be done either by raising pin
N on the V.35 interface (if the V.35/RS-422 device is DTE), or by
activating Local Loopback from the HSSI interface (if the HSSI device is
the DTE). The “test” LED should be lit.
B. Perform a BER (bit error rate) test from the DTE.