Spectracom 8144-DD Instruction Manual

MODEL 8144-DD

Clock Selector/Distribution Amplifier

Instruction Manual

SPECTRACOM CORPORATION

95 Methodist Hill Drive, Suite 500

Rochester, NY 14623

Phone [phone]

Fax [phone]

www.spectracomcorp.com

REVISIONS, IF ANY, ARE LOCATED AT THE END OF THE MANUAL

REVISION A

December 2003

(Model 8144-DD/075020)

5-Year Warranty

LIMITED WARRANTY________________________________

Spectracom warrants each new product manufactured and sold by
it to be free from defects in material, workmanship, and
construction, except for batteries, fuses, or other material normally
consumed in operation that may be contained therein, for five
years after shipment to the original purchaser (which period is
referred to as the "warranty period"). This warranty shall not
apply if the product is used contrary to the instructions in its
manual or is otherwise subjected to misuse, abnormal operations,
accident, lightning or transient surge, repairs or modifications not
performed by Spectracom.

The GPS receiver is warranted for one year from date of shipment
and subject to the exceptions listed above. The power adaptor, if
supplied, is warranted for one year from date of shipment and
subject to the exceptions listed above.

The Rubidium oscillator, if supplied, is warranted for two years
from date of shipment and subject to the exceptions listed above.

All other items and pieces of equipment not specified above,
including the antenna unit, antenna surge suppressor and antenna
pre-amplifier are warranted for 5 years, subject to the exceptions
listed above.

WARRANTY CLAIMS________________________________

Spectracom's obligation under this warranty is limited to in-factory
service and repair, at Spectracom's option, of the product or the
component thereof, which is found to be defective. If in
Spectracom's judgment the defective condition in a Spectracom
product is for a cause listed above for which Spectracom is not
responsible, Spectracom will make the repairs or replacement of
components and charge its then current price, which buyer agrees
to pay.

Spectracom shall not have any warranty obligations if the
procedure for warranty claims is not followed. Users must notify
Spectracom of the claim with full information as to the claimed
defect. Spectracom products shall not be returned unless a return
authorization number is issued by Spectracom. Spectracom
products must be returned with the description of the claimed
defect and identification of the individual to be contacted if
additional information is needed. Spectracom products must be
returned properly packed with transportation charges prepaid.

EXCEPT FOR THE LIMITED WARRANTY STATED ABOVE,
SPECTRACOM DISCLAIMS ALL WARRANTIES OF ANY KIND
WITH REGARD TO SPECTRACOM PRODUCTS OR OTHER
MATERIALS PROVIDED BY SPECTRACOM, INCLUDING
WITHOUT LIMITATION ANY IMPLIED WARRANTY OR
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

Spectracom shall have no liability or responsibility to the original
customer or any other party with respect to any liability, loss, or
damage caused directly or indirectly by an Spectracom product,
material, or software sold or provided by Spectracom,
replacement parts or units, or services provided, including but not
limited to any interruption of service, excess charges resulting from
malfunctions of hardware or software, loss of business or
anticipatory profits resulting from the use or operation of the
Spectracom product or software, whatsoever or howsoever
caused. In no event shall Spectracom be liable for any direct,
indirect, special or consequential damages whether the claims are
grounded in contract, tort (including negligence), or strict liability.

EXTENDED WARRANTY COVERAGE___________________

Extended warranties can be purchased for additional periods
beyond the standard five-year warranty. Contact Spectracom no
later than the last year of the standard five-year warranty for
extended coverage.

SPECTRACOM 95 Methodist Hill Drive Suite 500 Rochester, NY 14623

+1.585.321.5800 FAX: [phone] www.spectracomcorp.com [e-mail]

TABLE OF CONTENTS

SECTION 1 GENERAL INFORMATION

1.0 INTRODUCTION............................................................................... 1-1

1.1 FEATURES ....................................................................................... 1-1

1.2 WARRANTY INFORMATION AND PRODUCT SUPPORT .............. 1-2

1.3 MANUAL ERRATA AND SPECIAL DOCUMENTATION................... 1-2

1.4 UNPACKING..................................................................................... 1-2

1.5 CONFIGURATION OPTIONS ........................................................... 1-3

1.6 SPECIFICATIONS ............................................................................ 1-3

1.6.1 Inputs ................................................................................ 1-3

1.6.2 Outputs ............................................................................. 1-4

1.6.3 Power Requirements......................................................... 1-4

1.6.4 Mechanical and Environmental Specifications .................. 1-4

1.6.5 Status Indicators ............................................................... 1-5

1.6.6 Operator Controls.............................................................. 1-5

1.6.7 User-Configurable Options................................................ 1-6

1.6.8 Alarm Outputs ................................................................... 1-6

1.6.8.1 Alarm Classification ..................................... 1-6

1.6.8.2 Alarm Interface ............................................ 1-7

SECTION 2 INSTALLATION

2.0 INTRODUCTION............................................................................... 2-1

2.1 PREPARATION FOR USE................................................................ 2-1

2.1.1 AC Line Voltage Selection................................................. 2-1

2.1.2 Power Options................................................................... 2-2

2.2 SWITCH AND HEADER SETTINGS................................................. 2-3

8144-DD/075020

SECTION 3 OPERATION

3.0 INTRODUCTION ...............................................................................3-1

3.1 THEORY OF OPERATION................................................................3-2

3.2 FRONT PANEL FUNCTIONS............................................................3-2

3.3 REAR PANEL CONNECTIONS.........................................................3-4

SECTION 4 OPTIONS

4.1 DC POWER OPTIONS 52 AND 54....................................................4-1

4.2 MOUNTING OPTIONS ......................................................................4-1

4.2.1 Option 11, Rack Mount with Slides ....................................4-1

4.2.2 Option 102, 23/24-inch Rack Mount ..................................4-2

4.2.3 Option 103, Setback Mount ...............................................4-3

SECTION 5 SERVICE INFORMATION

5.0 MAINTENANCE AND CALIBRATION ...............................................5-1

5.1 FUSE REQUIREMENTS ...................................................................5-1

8144-DD/075020

LIST OF TABLES

TABLE 1-1 CONFIGURATION SUMMARY .........................................1-3

TABLE 2-1 SWITCH AND HEADER SETTINGS .................................2-3

TABLE 2-2 OUTPUT LINE LENGTH SWITCH ASSIGNMENTS .........2-8

TABLE 2-3 OUTPUT LINE LENGTH SWITCH SETTINGS..................2-8

TABLE 3-1 CLOCK OUTPUT CONNECTOR PINS .............................3-5

TABLE 4-1 OPTION 11 CHECKLIST...................................................4-1

TABLE 4-2 OPTION 102 CHECKLIST .................................................4-2

TABLE 4-3 OPTION 103 CHECKLIST .................................................4-3

LIST OF ILLUSTRATIONS

FIGURE 2-1 LINE VOLTAGE SELECTION/FUSE REPLACEMENT .....2-2

FIGURE 2-2 MODEL 8144-DD COMPONENT LAYOUT .......................2-4

FIGURE 2-3 8144-DD REAR PANEL.....................................................2-9

FIGURE 2-4 8144-DD FRONT PANEL ..................................................2-9

FIGURE 3-1 MODEL 8144-DD BLOCK DIAGRAM................................3-1

FIGURE 3-2 MODEL 8144-DD FRONT PANEL.....................................3-3

FIGURE 3-3 MODEL 8144-DD REAR PANEL .......................................3-4

8144-DD/075020

SECTION 1 GENERAL INFORMATION

1.0 INTRODUCTION

1.1 FEATURES

1.2 WARRANTY INFORMATION AND PRODUCT SUPPORT

1.3 MANUAL ERRATA AND SPECIAL DOCUMENTATION

1.4 UNPACKING

1.5 CONFIGURATION OPTIONS

1.6 SPECIFICATIONS

GENERAL INFORMATION

M

AJOR MINO

ALARMS

R

RESET ACO AB

READY

Clock Selector/Distribution Amplifier

INPUT SELECT

AB

AUTO

MANUAL

1.0 INTRODUCTION

Reliable timing in T1 networks is critical. The 8144 Clock Selector/Distribution Amplifier
enhances reliability by providing manual or automatic switchover to a backup system
clock when the primary system clock has failed. The 8144 also provides twelve outputs
for distribution of the selected clock.

1.1 FEATURES

The 8144 Clock Selector/Distribution Amplifier offers the following features:

• Manual or automatic switchover between two clock sources or single input
operation.

• Local and remote alarm indicators, normal or latched, reset from the front
panel.

• Redundant power sources

• Twelve independent outputs.

• DS1 input and output signals.

Instruction Manual 8144-DD/075020 Page 1-1

Section 1: General Information

1.2 WARRANTY INFORMATION AND PRODUCT SUPPORT

Warranty information is found on the leading pages of this manual. Contact Spectracom
Corporation to obtain a replacement or service.

Spectracom continuously strives to improve its products. We greatly appreciate any and
all customer feedback given. Please direct any comments or questions regarding
application, operation, or service to Spectracom's Customer Service Department.
Customer Service is available Monday through Friday from 8:30 A.M. to 5:00 P.M.
Eastern time at 585-321-5800.

Before returning any instrument to Spectracom Corporation, please contact Customer
Service to obtain a Return Material Authorization Number (RMA#). Please provide the
serial number and failure symptoms. Transportation to the factory is to be prepaid by
the customer.

1.3 MANUAL ERRATA AND SPECIAL DOCUMENTATION

Information concerning manual corrections or changes made to the instrument
occurring after the printing of this manual are found on the errata sheet located at the
rear of this manual.

Spectracom sometimes makes instrument modifications upon special request. The
documentation associated with any special modifications is also located in the back of
the manual.

1.4 UNPACKING

Upon receipt, examine the carton and its contents carefully. If there is carton damage
which results in damage to the unit, contact the carrier immediately so its representative
may witness such damage. If you fail to report shipping damage immediately, you may
forfeit any claim against the carrier. You should also notify Spectracom Corporation of
shipping damage or shortages so that we can either help you obtain a replacement or
repair the damaged equipment.

Open the shipping carton carefully and remove the packing list from the envelope on the
outside of the carton. Check the packing list against the contents to be sure all items
have been received, including an Instruction Manual and an ancillary kit.

Retain the carton and packing materials in the event the unit is reshipped or returned to
the factory.

Page 1-2 Instruction Manual 8144-DD/075020

Section 1: General Information

1.5 CONFIGURATION OPTIONS

The Model 8144-DD Clock Selector/Distribution Amplifier can be ordered in a variety of
power and mounting configurations. When specific configurations are referenced in this
Instruction Manual, the format 8144-DD-P-M is used, P and M are the power and
mounting option designations, respectively. The options are listed below in Table 1-1,
Configuration Summary.

Option Type Option Designation

Power
(P)

Mounting
(M)

AC (Standard)
12 to 24 VDC Power
48 VDC Power

19" Rack (Standard)
19" Rack with Slides
23/24" Rack
19" Setback Rack

TABLE 1-1 CONFIGURATION SUMMARY

(none)
52
54

(none)
11
102
103

1.6 SPECIFICATIONS

1.6.1 Inputs

The Model 8144-DD accepts one or two clock inputs as well as one or two alarm inputs.

DS1 CLOCK INPUTS

The DS1 clock inputs comply with ANSI T1.102-1987 as follows:

Line Rate: 1.544 Mb/s
Tolerance: ±130 ppm (200.72 Hz)
Level: 1.0 to 3.6V base-to-peak
Termination: Balanced twisted pair
Impedance: Terminated: 100 ohms ±5%, bridging >1500 ohms
Pulse Shape: Per ANSI T1.102-1987

Instruction Manual 8144-DD/075020 Page 1-3

Section 1: General Information

ALARM INPUTS

The alarm inputs are configured to operate as RS-422/485 receivers as follows:
Line Rate: DC
Level: Sensitivity ±200 mV, hysteresis 50 mV typical
Termination: Balanced twisted pair
Impedance: Terminated 120 ohms ±5%
Unterminated > 4K ohms

Alarm inputs can also be configured for contact closure input. A contact closure
between pins 1 and 3 on the alarm inputs alarms the A channel. A contact closure
between pins 4 and 6 alarms the B channel.

1.6.2 DS1 Outputs

The Model 8144-DD provides up to twelve clock outputs.

DS1 CLOCK OUTPUTS

The twelve DS1 clock outputs comply with ANSI T1.102-1987 as follows:
Line Rate: 1.544 Mb/s
Tolerance: Same frequency as input
Level: 2.4 to 3.6V base-to-peak into 100 ohms ±5%
Termination: Balanced twisted pair
Impedance: 100 ohms ±5%
Pulse Shape: Per Figure 1 of ANSI T1.102-1987

1.6.3 Power Requirements

Standard Option: 115/230 VAC ±15% 50/60 Hz, 15 watts
Option 52, 12 to 24 VDC: ±11.0 to 32.0 VDC, 12 watts
Option 54, 48 VDC: ±55.2 VDC ±20%, 12 watts

1.6.4 Mechanical and Environmental Specifications

Height: 2 rack units (3.50 inches)
Width: EIA 19" rack
Depth: 10 inches
Weight: 6 lbs. maximum

Temperature: 0 to +50°C operating range
Humidity: 95% R. H. non-condensing

Page 1-4 Instruction Manual 8144-DD/075020

Section 1: General Information

1.6.5 Status Indicators

The red MAJOR ALARM lamp is latched on for the following conditions:

LOS Loss of DS1 reference signal on both inputs.

AIS An Alarm Indication Signal on both reference inputs if
AIS is enabled for both inputs.

EXTERNAL ALARM INPUT An External Alarm Input on both alarm inputs.

The red MINOR ALARM lamp is latched for the following conditions:

LOS Loss of DS1 reference signal on one input.

AIS An Alarm Indication Signal on one reference input if
AIS is enabled.

EXTERNAL ALARM INPUT An External Alarm Input on one alarm input.

READY A/B
The green lamps indicate that clock input at A and/or B is available and that the
corresponding alarm input is not activated.

SELECTED A/B
The green lamps indicate that the A or B clock input has been selected.

1.6.6 Operator Controls

RESET: A momentary contact switch that resets latched MAJOR and

MINOR alarms

ACO: A

AUTO/MANUAL: Enables automatic switchover or manual selection of references.

PWR Turns power ON or OFF. Switch must be pulled out to toggle.

larm Cut Off. A momentary contact switch that removes the

remote alarm condition (unlatches the alarm relays).

Instruction Manual 8144-DD/075020 Page 1-5

Section 1: General Information

1.6.7 User-Configurable Options

Various options are configured using internal DIP Switches and headers. These options
are:

• Channel A/B RS-422/485 Alarm Input Termination – selects the termination

impedance for the alarm inputs.

• Channel A/B Clock Input Termination – selects the termination impedance for the

input reference clocks.

• Disable Channel B – for installations where only Channel A input is used.

• Major Alarm Indicator/Relay Latch – selects whether a Major Alarm is latched, or

reported only while the problem condition exists.

• Minor Alarm Indicator/Relay Latch – selects whether a Minor Alarm is latched, or

reported only while the problem condition exists.

• A/B AIS – selects whether the unit recognizes or ignores the Alarm Insertion Signal.

• DS1 Output Framing Mode – selects ESF or D4 framing outputs.

• DS1 Output Line Length Compensation – selects line buildout waveshaping for each

output.

1.6.8 Alarm Outputs

Alarm relays allow remote monitoring of operational status. Relay contacts are provided
for Major and Minor Alarms.

1.6.8.1 Alarm Classification

Major Alarm: A Major Alarm is asserted when detected faults compromise output
function. The outputs are removed during a Major Alarm condition. The latched alarm
relay is reset from the front panel ACO Switch. Faults and conditions listed below
actuate a Major Alarm.

LOS Loss of DS1 reference signal on both inputs.

AIS An Alarm Indication Signal on both reference inputs.

EXTERNAL ALARM INPUT An External Alarm Input on both alarm inputs.

POWER FAILURE External power failure, fuse or internal power supply

failure.

Page 1-6 Instruction Manual 8144-DD/075020