TC Communications TC8612 User manual

TC8612
8 Channel DIO Over T1/E1
Multiplexer
User Manual
MNL-86120-01-01

2 TC8612 Rev 1.1 User Manual
All Rights Reserved
Copyright © 2020 by TC Communications. Products described in this publication are protected
by one or more U.S. and foreign patents.
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The TC Communications® logo is a registered trademark.
JumboSwitch® is a registered trademark of TC Communications.
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The information given in this document is reviewed regularly and any necessary corrections will be included in
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translated to another language without the prior written consent of TC Communications.
Record of Revisions
Revision Date Description of Changes
1.0 3/10/14 Initial Release of TC8612.
1.1 08/27/2020 New version update
TC Communications
17881 Cartwright Road
Irvine, California U.S.A. 92614
Tel. [phone]
Fax [phone]
Website: www.tccomm.com

TC8612 Rev 1.1 User Manual 3
Guide to Alert Symbols
These alert symbols are used in Caution, Warning, and Danger notes.
Symbol Meaning
Pinching or crushing hazard
Electrical hazard.
Equipment alert: be careful of
damage from static electricity
General alert: used for all
other hazardous conditions
(referring to people, not
equipment).

TABLE OF CONTENTS
TOC-1 TC8612 Rev 1.1 User Manual
1Introduction
1.1 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.2 Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.2.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.2.2 Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
1.3 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
2 Installation
2.1 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.2 Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.3 Equipment Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.4 Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.5 Dry Contact Alarm Relay (DCAR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.6 System Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.7 System Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.7.1 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.7.2 Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2.7.3 Electrical Signal Interface Connection & Pin Assignments . . . . . . . . 2-6
3 Quick Start Guide
3.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.2 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
4 Tutorial
4.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.2 Latched Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.3 Remote Unit Status Monitoring and Remote Unit Alarm Reset . . . . . . . 4-2
4.4 Local Loopback Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4.5 Remote Loopback Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
4.6 T1/E1 Local Loopback Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
5 Troubleshooting
5.1 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
5.2 All LEDs are OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
5.3 Alarm LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Appendix A 19” Rack Mount Card Cage
A.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
A.2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
A.3 Chassis Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Appendix B R2 Button & LED Functions
B.1 R2 (“Reset Too”) Button Description . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
B.1.1 R2 (“Reset Too”) Push Button Functions . . . . . . . . . . . . . . . . . . . . . B-1
B.2 LED Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
B.3 CSU Loop Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2

TABLE OF CONTENTS
TC8612 Rev 1.1 User Manual TOC-2
Appendix C Return Policy
C.1 Return Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
C.1.1 Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
C.1.2 Limitation of Liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2

TC8612 Rev 1.1 User Manual 1-1
Chapter 1 Introduction
1.1 General Information
This manual is intended to describe the features and functionality in addition to
aiding in the planning, configuring, commissioning and maintaining of the
TC8612 Digital I/O (DIO) over T1/E1 multiplexer.
1.2 Product Description
The Model TC8612 8-Channel DIO over T1/E1 multiplexer is economical, simple
to install and comes standard with built-in power redundancy.
Diagnostics include DIP switches for Local & Remote Loopback and other
application configuration switches. Each unit also provides multiple LEDs for
Alarm, Power, Vcc, T1/E1 Status, and RLY & DET status LEDs for each channel.
Optional “Dry Contact Status Hold”*. When this feature is enabled, the dry contact
will retain the last “Open” or “Close” status if the T1/E1 link is broken.
A built-in sync mechanism verifies both device and T1/E1 link operation. No other
test equipment is required for link and device verification.
The TC8612 is compatible with standard 100ΩT1 for copper line lengths up to
6000ft and up to 2.5km for 75Ω/ 120ΩE1 (copper line length is the distance
between the TC8612 and the T1/E1 cross-connect). The T1/E1 uses a RJ48F
connector and the dry contact channels use RJ11 connectors.
An optional BNC adapter cable is available for 75 Ohm E1. Standard power is
12VDC or optional 24VDC, -48VDC, 125VDC, or 115/230VAC with an external
power cube. A high temperature version (-20°C to 70°C) and extreme temperature
version (-40°C to 80°C) are available for harsh environments.
*Contact factor for options

Chapter 1 Introduction Product Description
TC8612 Rev 1.1 User Manual 1-2
Figure 1-1 TC8612 DIO Over T1/E1 Multiplexer

Chapter 1 Introduction Product Description
1-3 TC8612 Rev 1.1 User Manual
Figure 1-2 TC8612 Front LED Definitions
1.2.1 Features
• 8-channel Dry Contact
• T1 Features:
- ESF Framing Support (SF Framing, Optional)
- Supports Line Length up to 3000ft (T1)*
- 24 timeslots (DS0) 1-24. TC8612 utilizes timeslots 12 and 24
• E1 Features:
- Supports Line Length up to 2.5km
- PCM31C Framing Support (PCM30, PCM30C, PCM31 Optional)
- 32 timeslots 0-31. TC8614 utilizes timeslots 15 and 31
• Very Low Latency - 1.5ms
ALM (Alarm) LED
xSolid: Latched alarm condition.
xFlash: Unit detect errors or in loopback mode.
xOff: Normal condition.
PWR (Power) A LED
PWR (Power) B LED
xSolid: Power supplied is good.
xOff: Power supply failed or card fuse is burned.
Vcc LED (Voltage) LED
xSolid: 5V DC is good.
xOff: No 5V DC is supplied to this card.
RMT (Remote Status Mode) LED (Activated by “R2”)
xSolid: Remote status.mode. (BPV, CRC, SYNC)
xFlash: Remote status not available.
xOff: Local status mode. (BPV, CRC, SYNC).
BPV (Bipolar Violations) LED
xBlink: Latched BPV error indication.
xFlash: Unit detected bipolar violations.
xOff: Normal condition.
CRC (T1/E1 CRC Error) LED
xBlink: Latched CRC error indication.
xFlash: Unit detected CRC error.
xOff: Normal condition.
SYNC (Loss of Frame) LED
xSolid: T1/E1 sync. (Normal condition)
xBlink: Latched T1/E1 sync loss indication.
xFlash: Unit detected T1/E1 sync loss.
Dry Contact Ports
RLY (Dry Contact Relay) LED
Green LED Status
xSolid: Relay is closed.
xOff: Relay is open.
Amber LED Status
xFlash: Local loopback is enabled.
xOff: Local loopback is disabled.
DET (Closure Detector) LED
Green LED Status
xSolid: Closure detected.
xOff: No closure detected.
Amber LED Status
xFlash: Remote loopback is enabled.
xOff: Remote loopback is disabled.
“R2” Button: Multi-Function Button
xShort Press (< 3 secs)
Toggle between Local (RMT LED Off) and
Remote status mode (RMT LED On).
Local Status Mode (RMT LED Off)
xPress and Hold (> 3 secs)
Clear local latched indication.
Remote Status Mode (RMT LED On)
xPress and Hold (> 3 secs)
Clear remote latched indication.

Chapter 1 Introduction Product Description
TC8612 Rev 1.1 User Manual 1-4
• Dry contact detectors with Isolated Ground
• LEDs for "DET/RLY" (to monitor each channel's analog and dry contact signal
status)
• LEDs for "SYNC", "AMI", "BPV", "LOS", "AIS", "RAI", "CRC" (to monitor
each T1/E1 channel status)
• LEDs for "PWR A," "PWR B," "Vcc," & "ALM" (to monitor each unit's
power supply and alarm condition status)
• Built-in Power Redundancy
• Diagnostic DIP Switches for Local Loopback, and T1/E1 Loopback Tests.
• Rack Mount or Stand Alone
*Note: For line lengths beyond 655ft additional testing is required.
1.2.2 Applications
The TC8612 Serial-over-T1/E1 Multiplexer provides an inexpensive method for
connecting Async/Sync terminals, printers, and status collecting devices. It is also
used in harsh environments where EMI/RFI interference, ground loops and lightning
conditions may exist.
Figure 1-3 Typical Application using the TC8612

Chapter 1 Introduction Specifications
1-5 TC8612 Rev 1.1 User Manual
1.3 Specifications
Channel Capacity
Channels 8 Channels of Bi-directional Dry Contact
Electrical
Dry Contact RJ11
T1/E1 Connector RJ48
Dry Contact Interface Specification
Mode Normal Open (Standard)
Normal Close (Optional)
Latency 1.5ms
Load Voltage (peak AC) 60V
Load Voltage (DC) 60V
Continuous load current 0.55A
Peak load current 1.2A
Max On Resistance 2.5Ω
Output Capacitance 150pF
System
Bit Error Rate 1 in 109or better
Visual Indicators PWR A, PWR B, Vcc, ALM, SYNC, AMI, BPV, LOS, AIS,
RAI, CRC, RMT
DET (1 each Dry Contact Ports 1-8)
RLY (1 each Dry Contact Ports 1-8)
Diagnostic Functions Local Loopback, Remote Loopback, and T1/E1 Loopback

Chapter 1 Introduction Specifications
TC8612 Rev 1.1 User Manual 1-6
Power Source
Standard 12VDC @300mA
Optional 24VDC, -48VDC, 125VDC, or 115/230VAC
with an external power cube
Temperature
Operating -10°C to 50°C
(Optional Hi-Temp Version) -20°C to 70°C
(Optional Extreme-Temp Version) -40°C to 80°C
Storage -40°C to 90°C
Humidity 95% non-condensing
Physical (Standalone Unit)
Height (3.53 cm) 1.40"
Width (18.14 cm) 7.20"
Depth (24.89 cm) 9.80"
Weight (907g) 2.0 lbs.
Physical (Rack mount 1U “Pizza Box” with two cards) Height
Height (4.45 cm) 1.75"
Width (48.26 cm) 19"
Depth (22.86 cm) 9"
Weight (1.86 Kg) 4.1 lbs.

TC8612 Rev 1.1 User Manual 2-1
Chapter 2 Installation
2.1 General Information
The installation section describes how to:
• Unpack the unit
• Ensure an optimum site location
• Install the power supply and dry contact connection
2.2 Unpacking
Before unpacking any equipment:
• Inspect all shipping containers for evidence of external damage caused during
transportation
• Inspect for damage after it is removed from the containers
2.3 Equipment Location
The TC8612 should be located in an area that provides adequate light, work space
and ventilation.
IMPORTANT Any claims concerning shipping damage should be made directly to
the pertinent shipping agencies. Any discrepancies should be
reported immediately to the Customer Service Department at TC
Communications, Inc. at [phone].
Important 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.

Chapter 2 Installation Power Supply
TC8612 Rev 1.1 User Manual 2-2
2.4 Power Supply
The TC8612 can powered by an external DC power adapter
rated 12 VDC @300mA. There are two terminal block
connectors labeled "PWR A" and "PWR B" only one is
required to power up the unit (single power option units, see
note below)*. Since each TC8612 card is equipped with a
power redundancy capability, the power LEDs on the front
panel will light according to which power jack (A or B) is connected. Both LEDs
will light when power redundancy is utilized.
2.5 Dry Contact Alarm Relay (DCAR)
A terminal block connector at the rear panel provides for the Dry Contact Alarm
Relay. This relay can be used in NO (Normal Open) or NC (Normal Close)
configuration.
When used in NO (Normal Open) configuration, the relay will close if the unit loses
power completely or the Alarm is on. The relay remains open during normal
operation.
When used in NC (Normal Close) configuration, the relay will open if the unit loses
power completely or the Alarm is on. The relay remains close during normal
operation.
2.6 System Start Up
Apply the power by plugging the power plug into a power jack (both PWRA &
PWRB for dual power units).
After power is applied, all LEDs (except PWR & VCC LEDs) will flash
momentarily and the following LED status should be observed from the front and
back panels:
1. The Power "A" and/or "B" and VCC LEDs should be lit.
Important Read and only connect a supply voltage that corresponds to the
type plate of your device. Make sure that the contact load capacity
of the signal contact is not exceeded.
NOTE TC8612 cards installed in the 1U rack chassis will not show the
PWR A LED in the “On” lit state and will be Off. This is normal
and the power to the card will be monitored by the VCC LED
being “On” lit.

Chapter 2 Installation System Configuration
2-3 TC8612 Rev 1.1 User Manual
2. The "AMI" LED on the rear panel will be Lit or Off depending on the setting
of the rear panel DIP switch SW4. The LED will be Lit when SW4 is “Off”
(Up) position, set for AMI. The LED will be Off when SW4 is “On” (Down)
position, set for B8ZS (T1) or HDB3 (E1).
3. The "ALM" and "SYNC" LEDs on the front panel will be flashing indicating
that the T1/E1 connection is not established. This is normal when T1/E1
connection has not been established.
2.7 System Configuration
The TC8612 has been pre-tested and switches have been set per factory
specifications. The channels can be factory configured (in groups of four) for RS-
232, RS-422 and RS-485 interfaces at the time of ordering.
2.7.1 Front Panel
Figure 2-1 TC8612 Front Panel
ALM (Alarm) LED
xSolid: Latched alarm condition.
xFlash: Unit detect errors or in loopback mode.
xOff: Normal condition.
PWR (Power) A LED
PWR (Power) B LED
xSolid: Power supplied is good.
xOff: Power supply failed or card fuse is burned.
Vcc LED (Voltage) LED
xSolid: 5V DC is good.
xOff: No 5V DC is supplied to this card.
RMT (Remote Status Mode) LED (Activated by “R2”)
xSolid: Remote status.mode. (BPV, CRC, SYNC)
xFlash: Remote status not available.
xOff: Local status mode. (BPV, CRC, SYNC).
BPV (Bipolar Violations) LED
xBlink: Latched BPV error indication.
xFlash: Unit detected bipolar violations.
xOff: Normal condition.
CRC (T1/E1 CRC Error) LED
xBlink: Latched CRC error indication.
xFlash: Unit detected CRC error.
xOff: Normal condition.
SYNC (Loss of Frame) LED
xSolid: T1/E1 sync. (Normal condition)
xBlink: Latched T1/E1 sync loss indication.
xFlash: Unit detected T1/E1 sync loss.
Dry Contact Ports
RLY (Dry Contact Relay) LED
Green LED Status
xSolid: Relay is closed.
xOff: Relay is open.
Amber LED Status
xFlash: Local loopback is enabled.
xOff: Local loopback is disabled.
DET (Closure Detector) LED
Green LED Status
xSolid: Closure detected.
xOff: No closure detected.
Amber LED Status
xFlash: Remote loopback is enabled.
xOff: Remote loopback is disabled.
“R2” Button: Multi-Function Button
xShort Press (< 3 secs)
Toggle between Local (RMT LED Off) and
Remote status mode (RMT LED On).
Local Status Mode (RMT LED Off)
xPress and Hold (> 3 secs)
Clear local latched indication.
Remote Status Mode (RMT LED On)
xPress and Hold (> 3 secs)
Clear remote latched indication.

Chapter 2 Installation System Configuration
TC8612 Rev 1.1 User Manual 2-4
2.7.2 Rear Panel
Figure 2-2 TC8612 Rear Panel
2.7.2.1 Rear Panel DIP Switch Functions
The DIP switch functions on the TC8612 are described below. To activate the
function, slide the appropriate switch to the On (Down) position.
•LOCLB: Local Loopback. This switch (SW1) initiates the Local Loopback
function. The dry contact detect status (RX) is looped back to the relay closure
pins (TX) for diagnostic testing.
•RMTLB: Remote Loopback. This switch (SW2) initiates the Remote
Loopback function. Enabling this function on the local unit triggers the remote
unit to loopback the received dry contact closure detect status.
Rear Panel Dip Switch Functions
SW1: LOCLB (Local Loopback)
xDown (On): Enable local loopback.
xUp (Off): Disable local loopback.
SW2: RMTLB (Remote Loopback)
xDown (On): Enable remote loopback.
xUp (Off): Enable remote loopback.
SW3: INT CLK (Internal Clock)
xDown (On): Enable internal timing mode.
xUp (Off): Enable RX loop timing mode.
SW4: B8ZS / HDB3 (Line Code)
xDown (On): B8ZS (T1) / HDB3 (E1)
xUp (Off): AMI
SW5: DIS ALM (Disable Alarm)
xDown (On): Disable alarm buzzer and dry
contact.
xUp (Off): Enable alarm buzzer and dry
contact.
SW6, SW7, SW8: L1, L2, L3 (Line Build-Out)
L1 L2 L3 T1
Up Up Up 0 – 133 feet
Down Up Up 133 – 266 feet
Up Down Up 267 – 399 feet
Down Down Up 400 – 533 feet
Up Up Down 534 – 655 feet
Down Up Down -7.5dB CSU
Up Down Down -15dB CSU
Down Down Down -22.5dB CSU
L1 L2 L3 E1
Up Up Up 75 ohm Normal
Down Up Up 120 ohm Normal
Up Up Down 75 ohm High Loss
Down Up Down 120 ohm High
Loss
AMI (Line Code) LED
xSolid: Unit is set for AMI line-code.
xOff: Unit is set for B8ZS (T1) / HDB3 (E1)
line-code.
RAI (Remote Alarm Indicator) LED
xFlash: Unit detected RAI (Yellow Alarm).
xOff: Normal condition.
AIS (Alarm Indication Signal) LED
xFlash: Unit detected AIS (Blue Alarm).
xOff: Normal condition.
LOS (Loss of Signal) LED
xFlash: No T1/E1 signal is detected.
xOff: Valid T1/E1 signal is detected.
Alarm Relay
NC (Normal Close)
xClose: When power is on and the alarm is off.
xOpen: When power is off, or the alarm is on.
NO (Normal Open)
xOpen: When power is on and the alarm is off.
xClose: When power is off, or the alarm is on.

Chapter 2 Installation System Configuration
2-5 TC8612 Rev 1.1 User Manual
•INT CLK: Internal Clock. This switch (SW3) is used to setup the internal
clock. "On" for internal T1/E1 timing mode. "Off " for Rx loop timing.
•B8ZS / HDB3: This switch (SW4) is used to setup the T1/E1 Line Code. "On"
for B8ZS (T1) / HDB3 (E1). "Off" for AMI (Both T1/E1).
•DIS ALM: This switch (SW5) is used to disable alarm outputs.
•L1, L2, L3: These switches (SW6, SW7, & SW8) are used to set the DSX-1
cross-connect distance (copper line build-out) for T1 applications or the
impedance for an E1 application.
For example, in a T1/E1 application, this is the length of twisted pair cable
connecting the TC8612 to the user's equipment, which may be a CSU or DSU. See
Table 2-1 and Table 2-2.
Table 2-1: Copper Line Length Setup Table
Table 2-2: E1 Termination Setup Table
T1 Settings
L1 L2 L3 Application Line Length
Up Up Up DSX-1 (0 to 133 feet) / 0 dB CSU
Down Up Up DSX-1 (133 to 266 feet)
Up Down Up DSX-1 (266 to 400 feet)
Down Down Up DSX-1 (400 to 533 feet)
Up Up Down DSX-1 (533 to 655 feet)
Down Up Down -7.5 dB CSU
Up Down Down -15 dB CSU
Down Down Down -22.5 dB CSU
E1 Settings
L1 L2 L3 Application Termination
Up Up Up 75 Ohm Normal
Down Up Up 120 Ohm Normal
Up Up Down 75 Ohm High Loss
Down Up Down 120 Ohm High Loss

Chapter 2 Installation System Configuration
TC8612 Rev 1.1 User Manual 2-6
2.7.3 Electrical Signal Interface Connection & Pin Assignments
The RJ-11 connectors are located at the front panel of the TC8612.
2.7.3.1 Dry Contact Ports
For dry contact closure applications, the TC8612 can be used as either the Closure
Detector or Relay depending on which pins are used.
By default, the dry contact Relay will open when T1/E1 link is not in sync.
(Optional factory setting: Dry contact Relay will retain the last good state when T1/
E1 link is not in sync.)
• The Closure Detector side has a dry contact closure detector.
• The Receiver side has a dry contact Relay.
The Close or Open status is controlled by a relay switch inside the card. It reflects
the remote detector's status. The virtual pin connections allow the TC8612 to be
used as either a closure detector or a dry contact relay. (See Dry Contact Closure
Detector, on page 2-7)
• The RJ-11's pins 4 and 5 are closed at the closure detector side, the status is
reflected at the remote relay side of the RJ-11's pins 2 and 3.
• The Relay switch is rated 1.5A DC maximum switching current with a
maximum voltage of 60 VDC. (See Specifications, on page 1-5.)
RJ-11 Dry Contact Relay Pin Assignment
Pin Connection RJ-11 Jack
1N/A
2Relay
3Relay
4 Detector
5 Detector GND
6N/A
6543 12

Chapter 2 Installation System Configuration
2-7 TC8612 Rev 1.1 User Manual
Figure 2-3 Dry Contact Closure Detector

TC8612 Rev 1.1 User Manual 3-1
Chapter 3 Quick Start Guide
3.1 Introduction
The TC8612 is designed for quick and easy installation. First, configure the unit for
your specific application by setting the Line Code, and Line Length DIP switches.
Once configured, you can connect the Dry Contact, T1/E1 signal source and power.
3.2 Setup
1. Select the appropriate Line Code for your application with the front panel dip
switch SW4. “On” (Down) for B8ZS(T1) or HDB3(E1) and “Off” (Up) for
AMI .
2. For T1 applications, set the Copper Line Length with the front panel SW6,
SW7, & SW8. Generally, it will be factory set to "0-133 feet."
3. For E1 applications, set the proper impedance for your application with the
front panel SW6, SW7, & SW8.
4. Set the appropriate T1/E1 timing mode with rear panel DIP switch SW3.
Thereshould be one and only one clock source throughout the entire T1/E1
network.
If two TC8612 units are connected back to back, one unit should set
to“Internal” timing mode, and the other unit should set to “RX Loop” timing
mode. “On” (Down) for internal timing mode. "Off" (Up) for Rx loop timing
mode.
5. Make sure to verify the Dry Contact as well as the T1/E1 pin connections.
Then make the actual connections to and from the TC8612s.
6. At the front panel, apply the dry contact signals by plugging in the RJ11
connector plugs one at a time. By opening and closing the TC8612 dry contact
closure detector pins, verify that the corresponding channel's "DET" LED turns
on to indicate the signal is being received. If the "DET" LED do not turn on for
a particular channel, it usually indicates incorrect connections at the RJ11 input
port (double-check your connections and verify them with the connection
diagrams in the Electrical Signal Interface section).
7. After the T1/E1 connection is established, the front panel "ALM" LED
shouldbe off and the "SYNC" LED should be lit solidly.
8. If the front panel "ALM" LED is solidly lit, press and hold the "R2" (“Reset
Too”) button for 3 seconds until the "ALM", "BPV", "CRC", and "SYNC"
LEDs are flashing. The alarm will reset after the "R2" button is released.

TC8612 Rev 1.1 User Manual 4-1
Chapter 4 Tutorial
4.1 Introduction
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
TC8612 in a controlled environment. Knowledge of these functions and features
will ease installation and troubleshooting efforts later on.
4.2 Latched Alarm
The front panel "ALM", "BPV", "CRC" and "SYNC" LEDs can display both
current and latched error conditions.
For example, if the "ALM" LED is on, and "SYNC" LED blinks twice, it indicates
that there are two "T1/E1 sync loss" after the last alarm reset.
To reset the alarm, press and hold the "R2" ("Reset Too") button for 3 seconds until
the "ALM", "BPV", "CRC", and "SYNC" LEDs are flashing. The alarm will reset
after the "R2" button is released.
See the table below for latched alarm definitions,
LED Normal Current Error Latched Error Note
ALM Off Flashing
Continuously
On
BPV Off Flashing
Continuously
Blink The number of blinks
indicates the number of
times the error condition
happens. (Max. 3 Blinks)
CRC Off Flashing
Continuously
Blink The number of blinks
indicates the number of
times the error condition
happens. (Max. 3 Blinks)
SYNC On Flashing
Continuously
Blink The number of blinks
indicates the number of
times the error condition
happens. (Max. 3 Blinks)