TC Communications TC1631R User manual

Notice!
Althougheveryefforthasbeenmadetoinsurethatthismanualiscurrent
and accurate as of date of publication, no guarantee is given or implied
that this document is error free or accurate with regard to any specifica-
tion. TC Communications, Inc. reserves the right to change or modify
the contents of this manual at any time without prior notification.
TC1631R/S
(With TB output)
RACK MOUNT/STAND ALONE
T1/E1 FIBER OPTIC MODEM
User's Manual
© COPYRIGHT 1992-2004. ALL RIGHTS RESERVED.
MODEL:
S/N:
DATE:
TC Communications, Inc. 17575 Cartwright Road - Irvine, CA 92614
Tel: [phone] Fax: [phone] Web Site: www.tccomm.com Email: [email protected]

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TC1631R/S
User's Manual
Rev. 1.6
This unit has been setup at the factory as follows:
LINE CODE LINE LENGTH
AMI B8ZS HDB3 T1/E1 0 -133 134-266 267-399 400-533 534-655
( ) ( )
Factory Default Configuration
SW1: Line Code switch setting (Only one setting should be marked):
AMI: SW1-3 in the
Down "On" position B8ZS/HDB3: SW1-3 in
the Up "Off" position
ON
3
2
1
4
A
M
I
B
8
Z
S
/
H
D
B
3
D
I
S
A
L
M
RMTL
B
L
O
C
L
B
ON
3
2
1
4
A
M
I
B
8
Z
S
/
H
D
B
3
D
I
S
A
L
M
RMTL
B
L
O
C
L
B
Important Note:The factory default setting for the Line Length is "0-133 feet." If the need arises to
change the Line Length, contact the Technical Support Department at TC Communications, Inc before
opening the unit to avoid the Warranty being voided.

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TC1631R/S
User's Manual
Rev. 1.6
Table Of Contents
Factory Default Configuration ................................................................................................................ 2
Chapter 1 - Overview ............................................................................................................................... 4
Description ........................................................................................................................................... 4
Front Panel.......................................................................................................................................... 5
LEDs Functions ............................................................................................................................ 5
SW1 External DIP Switch Functions ............................................................................................... 6
SW2 Internal DIP Switch Functions ................................................................................................ 6
Fiber Optic Specifications ................................................................................................................ 6
Transmission Distances (typical) .............................................................................................. 6
Launch Power & Sensitivity ....................................................................................................... 6
Rear Panel........................................................................................................................................... 7
Functional Description ...................................................................................................................... 8
Chapter 2 - Installation ............................................................................................................................ 9
Unpacking the Unit ............................................................................................................................ 9
Equipment Location .......................................................................................................................... 9
Power Supply...................................................................................................................................... 9
T1/E1 Connection .............................................................................................................................. 9
Dry Contact Alarm Relay................................................................................................................... 9
Installation Procedure....................................................................................................................... 9
TC1631R/S's Configuration ...........................................................................................................10
System Start Up ...............................................................................................................................11
Chapter 3 - Troubleshooting ................................................................................................................. 12
General ..............................................................................................................................................12
All LEDs are Off................................................................................................................................12
Alarm LED .........................................................................................................................................12
Optic Cable Types............................................................................................................................12
Calculating the Loss on the Fiber .................................................................................................12
Cable Connection Verification .......................................................................................................13
Dry Contact Alarm Relay.................................................................................................................13
Chapter 4 - Bench Tests ........................................................................................................................ 14
General ..............................................................................................................................................14
Test Equipment Requirements ......................................................................................................14
Pre-Installation Tests.......................................................................................................................14
Local Loopback Test ........................................................................................................................14
Optical Loopback Test .....................................................................................................................15
Remote Optic Loopback Test .........................................................................................................15
Chapter 5 - Component Placement ...................................................................................................... 16
Chapter 6 - Specifications ..................................................................................................................... 17
Appendix A.............................................................................................................................................. 18
Setting the E1 Interface Impedance .............................................................................................18
Appendix B.............................................................................................................................................. 19
Electrical Signal Cable Connection...............................................................................................19
Appendix C.............................................................................................................................................. 20
19" Rack with Dual Power Cards ...................................................................................................20
Appendix D.............................................................................................................................................. 22
Return Policy ....................................................................................................................................22
Warranty ............................................................................................................................................22

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TC1631R/S
User's Manual
Rev. 1.6
Chapter 1 - Overview
Description
The Model TC1631R/S is a T1/E1 Fiber Optic Modem that converts analog T1 or E1 signals to digital fiber
optic signal and vice versa. TC1631R is for 19" rackmount and TC1631S is for standalone unit. Both have
the same functions and features, the only difference is power connectors. For convenience, TC1631R/S and
TC1631 will be used interchangeably throughout this manual.
TC1631 offers advanced features such as digital transmission, jitter removal and a field replaceable Line
Interface Module. Because it is based on modern FPGA (Field Programmable Gate Array) technology, the
IC chip counts are reduced to a minimum, hence offering extremely low power consumption (less than 3
watts) and higher reliability.
Transparent to the framing format, the TC1631R/S’s T1/E1 interface shapes the transmit pulse to support
CCITT G.703, or, for connecting to DSX-1 cross connects, copper line distances are from 0 to 655 feet. The
internal elastic buffer removes jitter from transmit data.
The TC1631R/S has multiple LED indicators to ease installation and troubleshooting. These LEDs indicate
power,operatingvoltage,alarmstatus,localandremoteT1/E1signalloss,bipolarviolations,alloneswarning,
Optic signal sync active and more. Four DIP switches, accessible from the front panel, control settings for
Line Code, Local Loopback, Remote Loopback, and Disable Alarm. The internal SW2 DIP switches, control
the settings for the Line Length. The dry contact alarm relay switch provides remote alarm monitoring
capability.
The TC1631R/S is compatible with all types and sizes of fiber optic cable. Fiber optic connectors are ST
(optional FC). The T1 or E1 signal connects to two pairs of feed-thru detachable terminal block connectors
at the rear panel. Standard input power is 12V DC. Alternate power sources are available as an option (see
Chapter 6 - Specifications).
Note: The terms "TC1631R/S" and "TC1631" are used interchangeably in this manual.
Figure 1. Typical Point-to-Point T1/E1 Application
CSU/DSU
TC1631R/S
TC1631R/S
CHANNEL
BANK/
CUSTOMER
TERMINATION
DEVICE
T
1
/
E
1
T
1
/
E
1
T
1
/
E
1
T
1
/
E
1
OPTIC
TxA
() Optical Redundant Models Only
OPTIC
TxB
OPTIC
TxA
OPTIC
TxB
OPTIC
RxA
OPTIC
RxB
OPTIC
RxA
OPTIC
RxB

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TC1631R/S
User's Manual
Rev. 1.6
LEDs Functions
Alarm-
ALM: Alarm indicator. The Alarm LED will flash when following conditions occur:
The unit is in a diagnostic mode.
When an invalid line code or line length is set.
Optic signal is lost.
Local T1/E1 signal is lost or all ones signal is received from customer's device.
Remote T1/E1 signal is lost.
When the "Line Distance" setting is set as "0 0 1" or "0 1 0" (with internal SW2-6, 7, and 8).
Power Supply Status-
Power A/B: These LEDs indicate which power source on the rear panel the unit is drawing from. If power redundancy is
utilized, both LEDs will be lit.
Vcc: +5V Voltage indicator. This LED should light whenever power is connected to the unit. It indicates the
correct operating voltage is being derived from the power source.
Optic Signal Status-
Rx-A: Solidly lit, it indicates optic received "OK" from primary side ("A" side).
Flashes when the optical signal at Rx-A is lost.
Rx-B: Solidly lit, it indicates optic received "OK" from secondary side ("B" side).
Flashes when the optical signal at Rx-B is lost or "B" side is not enabled.
USE-B: Solidly lit, it indicates secondary optic signal is being used due to primary optic signal lost.
"Off" when secondary optic receiver is not enabled or primary optic signal is being used.
Note: Only when Optional Optical Redundancy is ordered on the units. Secondary side ("B" side) is optional.
SYNC: Solidly lit, it indicates a valid composite signal is being received.
Flashes when the optical signal is lost.
Configuration Setting-
LEN: Copper Line Length indicator. "Off" whenever the minimum T1 Line Length is set to "0-133 feet" (factory
default setting) or zero "0" for the E1 interface.
Solidly lit, when the T1 Line Length is set to any of the following lengths "134-266," "267-399," "400-533,"
or "534-655" feet, using the internal (SW2-6, 7 and 8) dip switches. (see Configuration Table - page 10). See
Important Note on page 2 before doing any changes.
Local T1/E1 status and warning-
LOCRD: Local Receive Data. Solidly lit, it indicates the T1/E1 signal is received from local user's equipment.
Flashes when the T1/E1 signal is lost from local user's equipment.
LAIS: Local All Ones. When flashing, it indicates "all ones" signal received from user's equipment.
BPV: Bipolar Violations. This LED will flash when bipolar violations (Line Code violations) are detected or the
Line Length setting is invalid.
LOCLB: Local Loopback. When lit, it indicates that the LOCLB function is enabled (SW1-2 is On).
Remote T1/E1 status and warning-
RMTRD: Remote Receive Data. Solidly lit, it indicates the T1/E1 signal is received from remote user's equipment.
Flashes when the T1/E1 signal is lost from remote user's equipment.
RAIS: Remote All Ones. When flashing, it indicates "all ones" signal received at the remote TC1631 unit.
RMTLB: Remote Loopback. When lit, it indicates that the RMTLB function is enabled (local SW1-1 is On).
Front Panel
Figure 2. TC1631R/S's Front Panel
T1/E1FIBEROPTICMODEM
R
x
A
RxB
T
x
A
TxB
TCCOMM.COM
MadeinU.S.A.
1
2
3
4
ON
1
2
3
4
A
M
I
B
8
Z
S
/
H
D
B
3
D
I
S
A
L
M
R
M
T
L
B
L
O
C
L
B
RMTRD
RAIS
RMTLB
LEN
LOCRD
LAIS
LOCLB
BPV
Rx-A
Rx-B
USE-B
SYNC
A
L
M
P
W
R
A
P
W
R
B
V
c
c

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TC1631R/S
User's Manual
Rev. 1.6
SW1 External DIP Switch Functions
Slide switch to the Down (On) position to activate the function.
SW1-1, Remote Loopback Test: This switch activates the remote unit into Remote Loopback function.
The composite optic signal is transmitted to the remote unit and decoded, then looped back to the local unit.
SW1-2, Local Loopback Test: This switch activates the Local Loopback function. The T1/E1 signal is
received and decoded, then looped back to the T1/E1 "out" terminals for diagnostic testing.
SW1-3: This switch selects the Line Code for AMI, B8ZS or HDB3.
"Up" for B8ZS or HDB3 and "Down" for AMI.
SW1-4, Disable Alarm: This switch disables the alarm buzzer and dry contact relay alarm.
SW2 Internal DIP Switch Functions (See Important Note on page 2 before doing any changes)
Slide switches to the Right (On) position to activate the function.
SW2-6/SW2-7/SW2-8: These switches define the DSX-1 cross connect distance.
There are 5 partitions to choose from. In a T1 application, this is the length of twisted pair
cable connecting the TC1631R/S to the user's equipment, which may be a CSU or DSU.
The cable lengths can be from 0 to 655 feet (see Figure 5).
Fiber Optic Specifications
Transmission Distances (typical)
The TC1631R/S is compatible with all popular sizes and types of fiber. Transmission distances up to 3km*
are typical over Multimode fiber at 850nm and 4km* at 1310nm. Distances to 34km* are typical over Single
Mode fiber at 1310nm.
Launch Power & Sensitivity
Transmitter: LED/ELED; typical Launch Power - -18dBm* (850nm/1310nm MM, @62.5/125µm)
-18dBm* (1310nm Single Mode, @9/125µm)
Receiver: PIN Diode; typical Sensitivity - -35dBm* (850nm/1310nm MM, @62.5/125µm)
-35dBm* (1310nm Single Mode, @9/125µm)
*Launch power, sensitivity and distances are listed for reference only. These numbers may vary. Contact factory for
higher loss budget requirements.
ON
1
2
3
4
ON
1
2
3
4
A
M
I
B
8
Z
S
/
H
D
B
3
D
I
S
A
L
M
RMTLB
L
O
C
L
B
ON

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TC1631R/S
User's Manual
Rev. 1.6
Figure 3. TC1631S Rear Panel
Rear Panel
Note: The T1/E1 signal is bipolar, independent of the polarity. Polarity on the "IN" & "OUT" terminal
block connector shown above is shown for reference only.
T1/E1 Signal Input, Output
Terminal Blocks
POWER
DRY CONTACT (ALARM)
+
+
-
-
+
+
-
-
PWR A PWR B
TC1631S Rear Panel
IN OUT
Normal open
Rating: 200 VDC @ 500ma max
12 VDC @ 350mA (typical)
24
48 VDC @ 100mA (typical)
125VDC @ 35mA (typical)
VDC @ 175mA (typical)
NOTE: TC1631 STAND-ALONE VERSION SHOWN
PWR
A
PWR
B
+ - + -
24VDC 48VDC 125VDC12VDC
Out ALARM InT1/E1

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TC1631R/S
User's Manual
Rev. 1.6
Functional Description
As shown in figure 4, the TC1631 consists of five basic function blocks: DIP switches, LEDs, T1/E1
interface, T1/E1 signal processor and optic interface.
DIP switches are used to configure the TC1631 according to a customer's application such as line code and
line distances. LEDs are used to display corresponding DIP switches settings, power supply status, optic
signal status, signal warnings, alarm, etc... the T1/E1 interface converts T1/E1 analog signals to digital
signals and provides local and remote loopback function. The signal processor composes T1/E1's timing and
data to a bit stream. The optic interface converts the electrical bit stream to an optic signal and vice versa.
Figure 4. TC1631R/S Functional Diagram
T1/E1 Signal Processor
Optic interface
(Optical
Redundant
Models Only)
AMI or
B8ZS/HDB3 Disable
Alarm
Remote
Loop
Test
LED Indicators on front panel
to optic
cable
to optic
cable
Replaceable T1/E1
line Interface Module
Elastic Buffer
to T1/E1 line
from T1/E1 line
Line Driver Line Receiver
TC1631R/S
External DIP Switches (accessible from front panel)
TxA
TxB
RxA
RxB
Local
Loop
Test
Power
A,B Vcc Alarm SYNCRx-B USE-B
Rx-A RMTRD LOCRD Local
Loop
back
Remote
Loop
back
Local All
Ones
Warning
Remote
All Ones
Warning
Bipolar
Violation
Line
length
Setting

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TC1631R/S
User's Manual
Rev. 1.6
Chapter 2 - Installation
Unpacking the Unit
Before unpacking any equipment, inspect all shipping containers for evidence of external damage caused
during transportation. The equipment should also be inspected for damage after it is removed from the
container(s).Claimsconcerning shipping damage shouldbemadedirectly to thepertinentshippingagencies.
Any discrepancies should be reported immediately to the Customer Service Department at TC Communi-
cations, Inc.
Equipment Location
TheTC1631R/S shouldbe located in an areathat provides adequate light, work space,and ventilation. Avoid
locating it next to any equipment that may produce electrical interference or strong magnetic fields, such as
elevator shafts or heavy duty power supplies. As with any electronic equipment, keep the unit from excessive
moisture, heat, vibration, and freezing temperatures.
Power Supply
Standard input power to the TC1631S is 12VDC @350mA. There are two power jacks at the rear panel for
power redundancy. TC1631R is the rackmount version of the TC1631S. It can be inserted into the card slot
when power is on (hot swapable).
T1/E1 Connection
Twopairs ofterminal block connectorsare provide forthe connection of the T1/E1wire pairs. Whenviewing
the rear panel, the left pair of terminal block connectors are for T1/E1 signal going into the TC1631R/S
(receive), while the right pair of terminal block connectors are for the transmit signal coming out of the unit,
refer to page 7.
Dry Contact Alarm Relay
A terminal block connector at the rear panel provides for the Dry Contact Alarm Relay. Normally in the
OPEN position, any alarm condition will force the switch to the CLOSED position. This relay can be
configured by the user if necessary (see Chapter 3 - Troubleshooting).
Installation Procedure
The TC1631R/S is designed for quick and easy installation. First, configure the modem for your specific
applicationby setting theLineCode DIP switch. Once configured,you can connect theoptical,T1/E1 signal
source and power.
Installation Procedure:
1. Select the Line Code (SW1-3).
2. For T1, the Line Length has been factory set to "0-133 feet."
3. Connect the T1/E1 signal source to the terminal block connectors on the rear panel.
4. Connect the optic cables. Verify single mode or multimode optic cable according to your TC1631
ordered. Using incorrect optic cables will result in a malfunction. Verify optic connections.
5. Connect the power. All the LEDs (except for PWRA and/or PWR B and Vcc) should flash for
approximately one second.
After installation is completed, it is an excellent idea to verify the optical cable loss. This reading will both
verify the integrity of the circuit and provide a benchmark for future troubleshooting efforts.

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TC1631R/S
User's Manual
Rev. 1.6
Figure 5. TC1631R/S Configuration Table
TC1631R/S's Configuration
1. Select the application's Line Code: SW1-3. Set the switch to the Up (Off) or Down (On) position.
AMI: Set SW1-1 to the Down (On) position.
B8ZS or HDB3: Set SW1-3 to the Up (Off) position.
2. The copper Line Length setting for T1 has been set as per factory default to "0-133 feet":
See Important Note on page 2 before doing any changes.
Slide the appropriate switches to the Right (On) position. Internal SW2-6, 7, 8 (see Figure 5).
Depending on the copper distance between the TC1631R/S and the T1 cross connect, set the copper Line
Length for the T1 transmit line driver according to the table below. When connecting to DSX-1 cross-
connects for copper Line Lengths ranging from 0 to 655 feet, see DIP Switch Functions on page 6. There
is no need to set the copper Line Length for E1 applications; set SW2-6, 7, and 8 to the Left (Off) position.
Note:The “Line Length” settings for “0 0 1” and "0 1 0" are invalid. If the copper “Line Length” is set
to (0 0 1) or (0 1 0), then the Alarm and BPV LEDs will flash, indicating the setting is invalid.
Legend:
0 = Off 1 = On
AMI
B8ZS
HDB3
0-133 feet
134-266 feet
267-399 feet
400-533 feet
534-655 feet
0-133 feet
134-266 feet
267-399 feet
400-533 feet
534-655 feet
0-655 feet
L I N E L E N G T H
SW2-6 SW2-7 SW2-8
0
1
1
1
1
1
0
0
1
1
1
0
1
0
1
1
0
0
1
1
1
0
1
0
1
0
1
1
1
1
0 0 0

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TC1631R/S
User's Manual
Rev. 1.6
3. Connect the T1 or E1 signal.
T1 signal connection for100 ohm line:Connect the incoming T1 signal (from your equipment) to the "in"
terminal blocks on the rear panel; they are not polarity sensitive. A valid T1 signal will cause the "LOCRD"
LEDturn "On." Connect theoutgoing T1 signal (receivedfrom the opticalcable) to the "out"terminal blocks.
E1 signal connection(The E1 interface can be used for either 75 or 120 ohm line - see Appendix A):
75 ohm line: Connect the incoming signal (from your equipment) to the "in" BNC adapter. Connect the
outgoing signal (received from optical cable) to the "out" BNC adapter.
120 ohm line:If twisted-pairs are used, connect the wires in the same way as the T1's wire. If dual coaxial
is used, connect the cores to the "in" terminal blocks for the incoming signal and to the "out" terminal blocks
for the outgoing signal (each cable has two cores & a shield).
4. Verify optical connections:
Make sure the local TC1631's optic "TxA" is connected to the remote TC1631's optic "RxA" (and vice-
versa).
For dual optical models only, make sure the local TC1631's optic "TxB" is connected to the remote TC1631's
optic "RxB" (and vice-versa).
5. Connect power to both units.
System Start Up
When power is initially connected, the following conditions should be observed:
1. The "POWER A" and/or "B" LED is lit.
2. The "LOCRD" LED is On, indicating a valid T1 or E1 signal input.
3. The "ALARM" LED should be Off.
Start the T1/E1 signal transmission:
4. The "POWER A" and/or "B" LED should be solidly lit.
5. The "SYNC" LED should be lit, indicating a valid optic signal is received.
6. The "LEN" copper Line Length LED will generally be "Off" since "0 to 133 feet" is the factory
default setting.
Lit when any of the following copper line lengths "134-266," "267-399," "400-533," or "534-655" feet
is selected. (See Important Note on page 2.)
Note: If the modem is not functioning properly at this point, please refer to Chapter 3 - Troubleshooting.

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TC1631R/S
User's Manual
Rev. 1.6
Chapter 3 - Troubleshooting
General
Alarm conditions occur whenever an optical problem or "fault" condition is detected by the TC1631.
All LEDs are Off
If no LEDs are lit on the unit, check the DC power supply, terminal block connector plug, change to alternate
powerjack onthe rear panel,fuses A and/or B indicatedon page 16, and/or thepower source. If theproblem
persists, contact the Technical Support Department at TC Communications, Inc.
Alarm LED
When an alarm condition is detected, the Alarm LED will flash. The following fault conditions will cause
the alarm to be triggered:
1. Optic signal lost from optic "RxA" or "RxB" (for optical redundant models only).
2. Optic signal is marginal, which causes invalid data packets to be received; the "SYNC" LED will "Flash."
3. Received "space" or "mark" from local T1/E1 device.
4. An invalid Line Code setting exists.
5. The Line Length setting does not match the Line Code.
6. The local or remote T1/E1 signal is lost; the "LOCRD" or "RMTRD" LED will be also be flashing.
Note: The "RMTRD" LED will "Flash" when there is no fiber cable connected or the fiber cable is bad.
Optic Cable Types
Conventionally, fiber optic cable withyellow-coloredinsulation is used for Single Mode applications;gray
or orange-coloredinsulated cable is for Multimode use. If Multimode cable is used in a Single Mode
application, the test results could be erroneous and confusing.
Calculating the Loss on the Fiber
The fiber optic link and/or connectors are frequently the source of various problems. Check out the
connectors and the integrity of the link first. Ideally, the link should be calibrated for total loss after the
installation has been completed. This will accomplish two things: (1) it will verify that the total loss of the
link is within the loss budget of the device and (2) it will provide a benchmark for future testing. For example,
a system that has been tested as having 6dB total loss when installed and suddenly tests out as having a loss
of 10dB probably has a connector or link problem.
*Thesenumbersarelistedforreferenceonly. WerecommendanOTDRreadingbeusedtodetermineactuallinkloss.
These are the reference values we use to calculate the loss on the fiber:
Multimode 850nm :3 dB loss per km on 62.5/125µm cable*
Multimode 1310nm :2 dB loss per km on 62.5/125µm cable*
Single Mode 1310nm :0.5 dB loss per km on 9/125µm cable*
Single Mode 1550nm :0.25 dB loss per km on 9/125µm cable*

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TC1631R/S
User's Manual
Rev. 1.6
Cable Connection Verification
Electrical Cables:
1. Make sure all electrical signal connections match the pin assignments (I/O) for the device (check User's
Manual if necessary).
2. Verify the signal connections by checking the status LEDs on the front panel of the TC1631R/S. If the
"LOCRD" LED is "Flashing", a transmit signal is not being detected from the local device. If the
"RMTRD" LED is "Flashing", no response signal is being detected from the remote device.
3. Verify that the correct Line Code setting (and copper Line Length setting for T1) has been configured
and that the appropriate LEDs light to match the settings selected.
4. Conduct a Local Loopback Test to help isolate an electrical interface problem (see Chapter 4 - Bench
Tests).
Optic Cables:
If the "SYNC" LED on the front panel is flashing, this is an indication that the optical signal is not being
correctlyreceived.Usually, unsecured fiber opticconnectorsorfaultycable are to blame. Agoodconnection
is indicated by the "SYNC" LED on the front panel being solidly lit. This indicates that the receiving cable
is correctly connected to Remote unit's optic "TxA" or "TxB" (dual optic models only).
Dry Contact Alarm Relay
TC1631 has built-in Dry Contact Alarm Relay. The status for the alarm relay is "normal open." It is
triggered by the following major alarm conditions:
Optic signal lost
Local T1/E1 signal lost
Local user's T1/E1 device is sending "mark" data pattern
Local user's T1/E1 device's signal is causing bipolar violations
Invalid line code setting
Invalid copper line length setting
The electrical rating for the dry contact alarm relay is
200VDC max
500 mA max.
switching power is 10 watts max.

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TC1631R/S
User's Manual
Rev. 1.6
Chapter 4 - Bench Tests
General
It is highly recommended to conduct bench tests before actual installation. Bench testing allows the user to
become familiar with all the functions and features of the TC1631 in a controlled environment. Knowledge
of the TC1631's functions and features will ease installation and troubleshooting efforts later on.
Test Equipment Requirements
End-user equipment required for testing:
1. Model 5575A T1 Micro BERT (Bit Error Rate Tester) Test Set with Terminal Block Connectors.
2. Two optical cable jumpers (patch cords) with appropriate connectors.
Pre-Installation Tests
1. Make sure the appropriate power supply accompanies the TC1631R/S unit (see page 9).
2. To verify that the unit functions properly, connect power to the unit's "PWR A" or "B" terminal blocks
(be sure to observe correct polarity) without connecting any other cables to the unit.
3. Onthe front panel,the appropriate greenPower "A" orPower "B" LEDshould be illuminated(depending
on whether you plug into the "A" or "B" terminal on the back of the unit). Both lights should be on if you
utilize power redundancy (power is plugged into both "A" and "B" on the rear panel).
4. The "ALM," "Rx-A," "SYNC," "RMTRD," and "LOCRD" LEDs should be flashing.
5. The "Vcc" LED should be illuminated. Please note: all other LEDs can be in a random state (flashing,
solidly lit, or off) as only upon proper receipt and transmission of a signal will the TC1631R/S unit set its
LEDs appropriately for normal operation. Proceed to the Local Loopback Test.
Local Loopback Test
The purpose of this test is to verify 1) the signal source recognition and 2) the connection between the
incoming signal and the TC1631R/S's terminal blocks.
1. Make sure your BERT tester is turned on and configured with the same setup as the TC1631R/S (and
your application).
2. Plug in the terminal blocks from the BERT tester to the TC1631R/S’s connectors on the rear panel.
When the input and output are connected correctly, the "LOCRD" LED on the TC1631R/S will turn On.
3. Slide SW1-2 (Local Loopback) to the Down (On) position. The "LOCLB" LED should be lit on the front
panel, indicating that the unit is in LOCLB mode.
Note: If this test is done without any fibers connected to the unit, the "ALM," "Rx-A," "SYNC," and
"RMTRD" LEDs will flash. Otherwise, they should be solidly lit.
4. Make sure the "TERM" or "BRIDGE" LED on the tester is lit, and that the tester is in the "RUN" mode.
The tester should indicate a "SYNC" signal.
5. If any other LEDs illuminate or flash, make sure that all
DIP switches on the TC1631R/S are in the correct
position, then reset the BERT tester. You should not see
any bit errors. To verify this, inject an error using the
BERTtestertoseeif it will berecordedbythetester,then
verify that no additional errors appear after the user
injected error. When done with the test, return SW1-2 to
the up "Off" position and proceed to the Optical Loopback
Test.
Local Loopback
IN
Optic RxA
Optic RxB
Optic TxA
Optic TxB
T1/E1
BERT
Tester
Local loopback
OUT
T1/E1 Line
Interface

- 15 -
TC1631R/S
User's Manual
Rev. 1.6
Optical Loopback Test
At any time you may use a short optic cable to loopback the unit's Optic "TxA" to "RxA" or "TxB" to "RxB"
(dual optic models only). The "SYNC" LED on the front panel should light (solid) when a good optic signal
is received. This test verifies the optic transmitter's function as well as the receiver's. Upon successful
completion of this test, proceed to the Remote Loopback Test.
Remote Optic Loopback Test
1. Connect a second TC1631R/S unit. As with the first unit, follow the bench test steps on the previous
page. When you have completed the Local Loopback & Optical Loopback tests for the second unit,
proceed to the next step.
2. Remove the optical jumper cable from the local unit's "RxA" and connect it to the second unit's optic
"RxA." Add a second optical jumper cable to connect the local unit's "RxA" to the second unit's "TxA."
3. Verify that both TC1631R/S units have the same Line Code and Line Length settings.
4. On the local TC1631R/S, slide SW1-1 (Remote Loopback) to the Down (On) position. The "RMTLB"
LED will momentarily flash until it receives the remote optical signal, then it should be lit, indicating that
theunit isin RMTLB mode. (Note, otherLEDs might flash for aboutthree seconds, but will settleddown
to their normal state.)
5. The "PWRA and/or PWRB," "Vcc," "Rx-A," "SYNC," "RMTRD," and "LOCRD" LEDs on the remote
TC1631R/S's front panel should be lit, as well as on the local unit.
6. Make sure the "TERM" LED on the tester is lit, and that the tester is in the "RUN" mode. The tester should
indicate a "SYNC" signal.
7. IfanyotherLEDsilluminate or flash ontheunit,makesurethatallDIPswitchesonbothof the TC1631's
are in the correct position, then reset the BERT tester. You should not see any bit errors.
8. At this point, both units tested will have passed all electrical and optical tests and will have been verified
that they are functioning properly. When done, return SW1-1 to the Up "Off" position. Proceed to the
next TC1631 unit to be tested or begin verifying other equipment and cabling in your application (if you
have not already done so).
Remote Optic Loopback
IN
IN
Optic RxA
Optic RxA
Optic TxA
(Optical Redundant Models Only)
Optic TxA
Optic RxA
Optic RxA
Optic TxA
Optic TxA
T1/E1
BERT
Tester
Remote Optic loopback
Remote TC1631Local TC1631
OUT OUT
T1/E1Line
Interface
T1/E1 Line
Interface
Local Optic Loopback
IN
Optic RxA
Optic RxB
Optic TxA
Optic TxB
T1/E1
BERT
Tester
Local o loopback
ptical
(Optical redundant
models only)
OUT
T1/E1 Line
Interface

- 16 -
TC1631R/S
User's Manual
Rev. 1.6
Chapter 5 - Component Placement
Figure 6. TC1631R/S's Internal PCB
INTERFACE MODULE
TERMINAL
BLOCK
CONNECTORS
+
+
--
U4
U3
U9
F1
POWERAPOWERB
F2
JP2
FPGA
chip
SW2
1
2
3
4
5
6
7
8
O
N
4
3
2
1
SW1
Dry contact alarm relay
terminal block connector
T1/E1 Line interface
module
T1/E1 input and output
terminal block connectors
Power A and B Terminal
block connectors
Fuses A, B
Oscillator
FPGA
FPGA configuration
EPROM
Primary Optic
Transmitter and
Receiver
(Optional)
Secondary Optic
Transmitter and
Receiver
DC regulator
Internal SW2
LED indicators LED indicators
External
DIP SW1
TxA
TxB
RxA
RxB

- 17 -
TC1631R/S
User's Manual
Rev. 1.6
Chapter 6 - Specifications
Data Rates
T1 (per channel) ........................................................................................... 1.544 Mbps
E1 (per channel) ........................................................................................... 2.048 Mbps
Line Code .......................................................................................AMI, B8ZS, or HDB3
Optical
Transmitter ...................................................................................................... LED/ELED
Receiver ..........................................................................................................PIN Diode
Wavelength ............................................................................850nm/1310nm Multimode
.......................................................................................................1310nm Single Mode
Fiber Optic Connectors ..................................................................... ST* (FC optional)
Loss Budget ..........................................15dB Multimode 850nm/1310nm @62.5/125µm
......................................................................................20dB** Single Mode @9/125µm
Electrical
Interface ..................................................................................................................T1/E1
T1 Connector (100 ohm) ......................................................................... Terminal Block
E1 Connector (120 ohm) ......................................................................... Terminal Block
E1 Connector (75 ohm) .............................................Terminal Block with BNC Adapter
System
Bit Error Rate ...................................................................................... 1 in 1010 or better
Visual Indicators .................. ALARM, PWR A, PWR B, Vcc, SYNC, Rx-A, Rx-B, USE-B,
.................................... RMTLB, LOCLB, BPV, LEN, AMI, LAIS, RAIS, LOCRD, RMTRD
Dry Contact Alarm................................................................. 200VDC, 500mA (10watts)
Power Source
Standard.................................................................12V DC(9-14VDC) @350mA (typical)
Optional ......................................................115V or 230V AC with external power cube
Optional ..........................................24VDC (18-36VDC), 48VDC (36-75VDC), or 125VDC
Temperature
Operating ................................................................................................... -10oC to 50oC
Hi-Temp...................................................................................................... -20oC to 70oC
Storage....................................................................................................... -40oC to 90oC
Humidity........................................................................................ 95% non-condensing
Physical
*ST is a trademark of AT&T
**Contact factory for requirements higher than 20dB .
Rack Mountable Card
Height ........................... (17.7 cm) 7.0"
Width ............................ (3.2 cm) 1.25"
Depth .......................... (14.8 cm) 5.75"
Weight ..................... (192 gm) 5.44 oz
Stand Alone Unit
Height ..........................(18.2 cm) 7.2"
Width ............................. (3.5 cm) 1.4"
Depth ..........................(16.6 cm) 6.60"
Weight .....................(512 gm) 14.5 oz

- 18 -
TC1631R/S
User's Manual
Rev. 1.6
Appendix A
TheE1interfaceimpedanceontheTC1631R/S is user configurable by changing thejumpersontheinterface
module. Please follow the instructions below to set the E1 impedance appropriately.
Setting the E1 Interface Impedance
1. Unscrew the 2 front panel screws and slide the unit out of it's housing.
2. Locate the interface module at board location JP2 (the board plugs vertically into the main board's socket).
3. For 75 ohm impedance, the jumpers on the interface module should be set as follows:
JP2 and JP3------- installed
Figure 7. TC1631R/S's E1 (75 ohm) Interface Module Configuration
4. For 120 ohm impedance, the jumpers on the interface module should be set as follows:
JP2 and JP3------- removed
5. Slide the unit back into the housing and secure the 2 front panel screws.
Figure 8. TC1631R/S's E1 (120 ohm) Interface Module Configuration
JP2
JP2
JP3
JP3
JP2
JP2

- 19 -
TC1631R/S
User's Manual
Rev. 1.6
Appendix B
Electrical Signal Cable Connection
The user's device may have a DB15 or RJ45 connector. The following connection diagrams illustrate the
signal flow direction and pin assignments typically used with these connectors.
Note: The polarity of the T1/E1 signal is bipolar, independent of the polarity. Polarity is shown for reference
only.
Figure 9. DB15 Connection Diagram
Figure 10. RJ45 Connection Diagram
Note:Pins7, 8,12,14 and15are notusedon theDB15connector. Pins 5,6,10 and13are reservedforTelco use.
Note:Pins3and6arenotusedontheRJ45connector. Pins7and8areusedforoptionalshieldconnections.
(TransmittoNetwork)
User'sDevice
12345678
9101112131415
DB15 Connector
(TransmittoNetwork)
(Receive from Network)
(ReceivefromNetwork)
TC1631
TerminalBlock
Connectors
IN
OUT
(Transmit to Network)
TC1631
Terminal Block
Connectors
User's Device
12345678
RJ45 Connector
(Transmit to Network)
(Receive from Network)
(Receive from Network)
IN
OUT

- 20 -
TC1631R/S
User's Manual
Rev. 1.6
Appendix C
19" Rack with Dual Power Cards
The picture shows the 19" rack with dual power supply cards. It consists of two subassemblies; TCRM192-
D-48 which is the 19" rack with dual 48VDC to 12VDC power cards and the TCRM192-BKPL, which is
the power back plane. The power card can be ordered for universal AC input or 24VDC input. The output
of each kind of power card is 12VDC, different input voltage has different output power rating. They are
listed as following:
TCRM192-D-48: 19" rack with dual power cards, each has 48VDC(36-75VDC) input, 12VDC output and
150 Watts.
TCRM192-D-24: Same as above but with 24VDC(18-36VDC) input, 12VDC output and 100 Watts output
power.
TCRM192-D-01: 19" rack with dual power cards, each has universal AC input (90VAC to 240VAC, 50Hz
to 60Hz) with 12VDC output. Maximum output power is 65 Watts. The diagram on the next page shows
the equivalent circuits.
Theadd-onsubassembly to the 19"rackisTCRM-bkpl, which is apowerstripPCB connected to bothpower
cards via two pair cable assembly. This power back plane has built-in fuses and power indicators to ease
installation and troubleshooting.
Fuse A,B
for primary
power card
48(24)VDC input
for primary
power card
48(24)VDC input
for secondary
power card
AC power input
for secondary
power card
AC power input
for primary
power card
Fuse A,B
for secondary
power card
Power indicators
for power A,B
Primary power card
Secondary power card
Power indicators
for power A,B