Telenetics 2185 User Manual

Telenetics

2185 Digital Bridge

User Guide

Notice

2001 Telenetics Corporation
25111 Arctic Ocean
Lake Forest, California 92630
[phone]
All rights reserved
Printed in U.S.A.

Proprietary Material

Information and software in this document are proprietary to Telenetics
Corporation (or its Suppliers) and without the express prior permission
of an officer of Telenetics Corporation, may not be copied, reproduced,
disclosed to others, published, or used, in whole or in part, for any pur­pose other than that for which it is being made available.

This document is for information purposes only and is subject to change
without notice.

Warning

This equipment generates, uses and can radiate
radio frequency energy and if not installed and
used in accordance with the instruction manual,
may cause interference to radio communica­tions. It has been tested and found to comply
with the limits for a Class A computing device
in accordance with the specifications in Subpart
J of Part 15 of FCC rules, which are designed to
provide reasonable protection against such
interference 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 or her own expense, is required
to take whatever measures may be required to
correct the interference.

Notice (cont’d)

Warning

This equipment does not exceed the Class A
limits for radio noise interference emissions
from digital apparatus as specified in the radio
interference regulations of the Canadian
Department of Communications.

Contents

Chapter 1, Introduction

Introduction ..................................................................................... 1-1

2185 FEATURES ............................................................................ 1-1

Data Interface ............................................................................ 1-1

Main Channel Broadcast ........................................................... 1-2

Subchannel Contention .............................................................. 1-2

Synchronous Data Retiming Buffer .......................................... 1-2

Anti-Streaming .......................................................................... 1-3

APPLICATIONS ............................................................................. 1-3

Port-Sharing Mode .................................................................... 1-4

Modem-Sharing Mode ............................................................... 1-5

Co-Located Terminals ............................................................... 1-6

Cascading the 2185 .................................................................... 1-6

Specifications .................................................................................. 1-9

Chapter 2, Installation

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

CUSTOMER RESPONSIBILITIES ............................................... 2-1

Site Selection and Preparation ........................................................ 2-1

Unpacking ....................................................................................... 2-2

Packing Materials ...................................................................... 2-2

Equipment Supplied .................................................................. 2-2

Damage/Material Shortages ...................................................... 2-2

Installation Procedure ..................................................................... 2-3

Equipment Assembly ................................................................. 2-3

Installation Tools Required ........................................................ 2-3

Mechanical Installation ............................................................. 2-3

Cabling ...................................................................................... 2-3

Chapter 3, Operation and Configuration

Introduction ..................................................................................... 3-1

Operating Controls and Indicators .................................................. 3-1

Function Switches ........................................................................... 3-3

Function Switch One ................................................................. 3-3

Function Switch Two ................................................................. 3-4

Function Switch Three ............................................................ 3-14

LED Indicators .............................................................................. 3-14

Configuration Examples ............................................................... 3-14

Digital Bridging Application Example .................................... 3-15

Leased-Line Backup Application Example ............................. 3-18

Multimaster Multidrop Application Example ......................... 3-22

Main Power Connection ............................................................... 3-26

Operation ...................................................................................... 3-28

Power-Down Procedure ................................................................ 3-28

Telenetics 2185

Chapter 4, Operation and Configuration

Maintenance Philosophy ................................................................. 4-1

Preventive Maintenance ............................................................. 4-1

Corrective Maintenance ............................................................. 4-1

Recovery from Anti-Streaming Alarm Condition ..................... 4-1

Returning Defective Equipment for Repair .................................... 4-2

General Packing Information ..................................................... 4-2

Installations in the USA ............................................................. 4-2

Installations Outside the USA or Canada .................................. 4-3

Chapter 5, Ordering Information

Introduction ..................................................................................... 5-1

Ordering Information ................................................................. 5-1

Glossary

Index

vi

Chapter 1

Introduction

INTRODUCTION

Your Telenetics 2185 is a digital bridge that can connect up to five sub­channel devices to a single main channel device. Sharing computer and
communications resources through a 2185 can achieve significant sav­ings in hardware and line costs.

The 2185 is a versatile unit that can be used in both port-sharing and
modem-sharing applications. The main channel and each of the five
subchannels are individually configurable as either EIA 232-D Data
Terminal Equipment (DTE) or Data Circuit-terminating Equipment
(DCE).

Data received on the main channel is broadcast simultaneously to the
subchannels. Subchannels contend for one-at-a-time access to the main
channel.

2185 FEATURES

To ensure trouble-free operation and allow for network growth you
2185 has a number of impressive built-in features including subchannel
contention, anti-streaming, and a synchronous data retiming buffer.

Data Interface

To virtually guarantee you are able to connect your equipment to the
2185, all data interfaces (main channel and five subchannels) are EIA
232-D compatible. They can be individually configured as DTE or DCE
via front-panel-mounted DIP switches. All connections to the 2185 are
made via straight-through cables.

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Telenetics 2185

Main Channel Broadcast

Data received on the main channel is broadcast to all subchannels. In
synchronous operation, the corresponding clock is also broadcast.

DSR and DCD are sent to all subchannel DTE devices, and DTR and
RTS to all subchannel DCE devices.

Subchannel Contention

Subchannels contend for use of the main channel to send data to the
CPU, controller, or other device. If more than one subchannels attempts
to gain access to the main channel at one time, the 2185 selects one sub­channel and blocks data from all others. Subchannel contention reduces
the garbling of data during network failure conditions. Either of two
modes of contention may be selected: data contention or control signal
contention.

In the data contention mode, subchannel devices contend for access to
the main channel by sending data (beginning with a space bit). The
selected subchannel is disconnected from the main channel after 16 con­secutive mark bits are detected.

In the control signal contention mode, subchannel devices contend by
raising control signal RTS if the device is a DTE, or control signal DCD
if the device is a DCE. The 2185 returns CTS to a selected subchannel
DTE device. The selected subchannel disconnects from the main chan­nel when the subchannel device drops RTS or DCD.

Synchronous Data Retiming Buffer

In synchronous operation, the 2185 uses an internal buffer to retime
inbound subchannel data to the main channel clock. To allow for unin­terrupted service, this buffer compensates for phase differences between
the subchannel and main channel clocks and can absorb clock jitter and
minor differences in frequency. Without the buffer the differences in

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Telenetics 2185

phase, frequency, and the presence of jitter could cause the subchannel
and the main channel to lose synchronization. If synchronization is lost,
data errors occur and transmission fails.

When the 2185 is configured for asynchronous operation, the retiming
buffer is bypassed.

Anti-Streaming

Anti-streaming protects the network from becoming jammed if one of
the subchannel devices fails. If the subchannel remains active for longer
than the anti-streaming time-out period, nominally 25 seconds, it auto­matically is disabled and its alarm LED indicator lamp illuminates.

When a subchannel is disabled, it disconnects from the main channel
and is not permitted to contend for the main channel again until after it
is re-enabled. Before attempting to re-enable the subchannel device, it
must be inactive for approximately 1.5 seconds. The alarm LED then
extinguishes and the subchannel can again contend for the main chan­nel. You may disable anti-streaming with a front panel switch.

APPLICATIONS

The 2185 is used in multipoint networks made up of a controller and
polled terminals. The controller inserts terminal address codes and the
terminals must be able to respond to their own address code. The 2185
arbitrates if two or more terminals try to transmit simultaneously.

When considering possible applications for your 2185, remember the
following points:

• The 2185 can transmit in either asynchronous or synchronous for­mat, but all devices in the network must use the same format.

• All devices must operate at the same data rate. When the main
channel is connected to a DCE device, the transmit and receive
clocks may be at different rates, but all devices have common
transmit clocks and common receive clocks.

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Telenetics 2185

• When operating with control signal contention, the 2185 is trans­parent to the data stream.

• When operating with data contention, subchannel data must be
mark idle and 16 consecutive marks cannot appear in mid-mes­sage. The minimum data rate for an external clock is 50 bps.

Port-Sharing Mode

In the port-sharing mode, the 2185's main channel is connected directly
to a CPU or controller port (DTE). Subchannel devices communicate
with the 2185 via modem links. Figure 1-1 shows a typical port-sharing
application.

Figure 1-1. Port-Sharing Application

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Telenetics 2185

Modem-Sharing Mode

In the modem-sharing mode, the CPU or controller is at a site remote
from the 2185. The 2185's main channel connects to the CPU through a
modem link (DCE). Subchannel terminals are connected directly to the

2185. Modem-sharing operation is illustrated in Figure 1-2.

Figure 1-2. Modem-Sharing Application

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Telenetics 2185

Co-Located Terminals

Any combination of subchannel DTE devices and subchannel DCE
devices is possible. For example, local subchannel terminals can be co­located with modes that communicate with devices at remote sites. Fig­ure 1-3 shows an example of co-located terminals in the port-sharing
mode. Co-location of ports and modems is also possible in the modem­sharing mode.

Figure 1-3. Co-Located Terminals Application

Cascading the 2185

The 2185 can be cascaded to increase the number of channels connected
to the main channel controller. Cascading is accomplished by connect­ing the main channel of one unit to a subchannel of another unit. See
Figure 1-4.

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Telenetics 2185

Figure 1-4. Local Cascading Application

1-7

Telenetics 2185

Two or more of the 2185s can be located at one site as shown in Figure
1-4. Alternatively, the units may be located at sites remote from each
other, and connect via modems. See Figure 1-5.

Figure 1-5. Remote Cascading Application

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Telenetics 2185

SPECIFICATIONS

Table 1-1 summarizes 2185 specifications.

Table 1-1. 2185 Specifications

Data Rates

Internally Generated 75,1200,2400,4800,7200,9600,14400,1920

0, bps (all ± 0.01%)

Externally Clocked Any rate up to 20000 bps

Data Format Asynchronous or Synchronous

Synchronous Retiming Buffer Elastic storage buffer with ± 4-bit capacity

Subchannel to
Main Channel Contention

Data Interface
Characteristics

Anti-Streaming Timers

Disable Timer 25 seconds (+2.3/–1.1 seconds)

Re-Enable Timer 1.5 seconds (+0.20/–0.01 seconds)

Physical Characteristics

Height 2.75 in (6.69 cm)

Width 8.54 in. (21.69 cm)

Depth 16.00 in. (40.64 cm)

Weight 5.00 lb (2.3 kg)

Environmental
Characteristics

Operating Temperature 32°F to 122°F (0°C to 50°C)

Humidity 95% maximum (non-condensing)

Altitude Sea Level to 8000 ft (2440m)

AC Power Requirements

Control Signal (RTS or DCD) or Data
Contention

Compatible with EIA 232-D and CCITT
V. 2 4

90 V ac to 132 V ac
or
180 V ac to 264 V ac

47 to 63 Hz

10 Watts max. power consumption

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Telenetics 2185

1-10

Chapter 2

Installation

INTRODUCTION

This chapter contains the information you need to install you Telenetics

2185.

CUSTOMER RESPONSIBILITIES

After delivery of your equipment and before installation, you are
responsible for moving it to the installation site, unpacking and check­ing it for material shortages and/or damage, which may have occurred
during shipment.

SITE SELECTION AND PREPARATION

Ensure that the area where your Telenetics 2185 is to be installed is
clean and free from extremes of temperature, humidity, shock, and
vibration.The site must meet the physical, environmental and power
requirements listed in Table 1-2 - 2185 Specifications.

Install the 2185 within 5 feet (1.5 meters) of a grounded ac outlet capa­ble of furnishing the required primary power (115 V ac or 230 V ac).The
unit must also be located within 50 feet (15.2 meters) of the terminal
ports and/or modems to be connected to it.At least 5 inches (12.7 cm)
clearance at the rear of the unit is needed for interface cabling.

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Telenetics 2185

UNPACKING

Packing Materials

Your 2185 is wrapped in re-usable, shock-absorbent packing material.
Telenetics recommends that you keep this packing material and the
shipping carton in case the unit must be stored, shipped, or returned to
Telenetics for service.

Check the contents of the package against the packing list for material
shortages and inspect the unit, for physical damage, which may have
occurred in shipment.If there is any damage to the equipment, contact
the shipping agent immediately.

Equipment Supplied

The contents of the shipping carton are as follows:

• One Telenetics 2185

• One transformer

• One Telenetics 2185 Operator's Guide

Damage/Material Shortages

Direct any additional questions about damage or missing parts to your
nearest Telenetics representative, or contact:

Telenetics Corporation
25111 Arctic Ocean
Lake Forest, California 92630
[phone]
Web site: htttp://www.telenetics.com

2-2

Telenetics 2185

INSTALLATION PROCEDURE

Equipment Assembly

The 2185 is shipped as a completely assembled unit with the printed cir­cuit board and power supply sub-assemblies already installed.No further
assembly is required.

Installation Tools Required

The only tool required is a small slot screwdriver to tighten the screws
securing the interface cable connectors to the connectors on the unit's
rear panel.

Mechanical Installation

The 2185 is a “tabletop” unit.No provisions are made for securing the
unit to any surface.

Cabling

All external connections to the 2185 are made via EIA 232-D, 25-pin,
connectors located on the rear panel (see Figure 2-1) and their associ­ated straight-through cables.There are six connectors, one for the main
channel, and one for each subchannel.

In Figure 2-1:

Port 0 = Main Channel Port 1 = Subchannel 1
Port 2 = Subchannel 2 Port 3 = Subchannel 3
Port 0 = Subchannel 4 Port 1 = Subchannel 5

2-3

PORT 5 PORT 4 PORT 3

PORT 0PORT 1PORT 2

Figure 2-1. Rear Panel Assembly

Note: The 2185 may have its main channel or any subchannel config­ured as DCE or DTE.Any necessary signal crossovers are performed
internally.

Telenetics 2185

Note: The 2185 may have its main channel or any subchannel
configured as DCE or DTE. Any necessary signal crossovers
are performed internally.

Figure 2-2. Straight-Through Cable Interface

Figure 2-2 shows the straight-through cable signal interface. Be sure to
tighten all connectors securely to ensure good mechanical connection,
and to assure the integrity of the cable shield.

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Telenetics 2185

2-6

Chapter 3

Operation and Configuration

INTRODUCTION

This chapter describes the 2185 operating controls and indicators, how
to configure and operate your 2185 using these operating controls, and
how to power-up and power-down the unit.

Once configured, your 2185 operates unattended, without operator
intervention. Occasional monitoring of the LED status indicators is
recommended.

OPERATING CONTROLS AND INDICATORS

The 14 LED indicator lamps used to monitor operating status on the
2185 are visible from the front of the unit through windows in the
swing-down front door (see Figure 3-1). All operating controls and
switches on the 2185 are readily accessible when you open the front
door (see Figure 3-2).

Figure 3-1. Front View (Door Closed)

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Telenetics 2185

Figure 3-2. 2185 Inside Front Panel

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Telenetics 2185

FUNCTION SWITCHES

The front-panel-mounted controls consist of three Dual In-line Package
(DIP) function switches. Switch banks one and two contain eight indi­vidual switches and switch three contains six individual switches.

The role of function switches one, two and three is summarized in
Tables 3-1 through 3-5. The following paragraphs describe these func­tions in more detail.

Function Switch One

Function switch one is an eight-segment DIP switch used to enable or
disable each of the five subchannels. It is also used to set the clock data
rate.

Switch segments 1-1 through 1-5 Disable/Enable subchannels one
through five respectively. Their operation is described as follows:

• Switch 1-n is set to up position to disable Subchannel n

• Switch 1-n is set to the down position to enable Subchannel n,
where n = 1 - 5

Subchannels may be disabled to prevent them from contending for the
main channel. The main channel broadcasts to all subchannels, whether
the subchannels are enabled or disabled. Unused subchannels should be
disabled (i. e., appropriate switch set to the up position).

Table 3-1. Enabling/Disabling Subchannels

Switch Up Down

1-1 Disable Subchannel 1 Enable Subchannel 1

1-2 Disable Subchannel 2 Enable Subchannel 2

1-3 Disable Subchannel 3 Enable Subchannel 3

1-4 Disable Subchannel 4 Enable Subchannel 4

1-5 Disable Subchannel 5 Enable Subchannel 5

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Telenetics 2185

Switch segments 1-6 to 1-8 are used to set the data rate on the 2185. See
Table 3-2 for information on setting these switches.

Table 3-2. Data Rate Selection

Using Switch Segments 1-6 to 1-8

Clock Data

Rate (bps) Set 1-6 to: Set 1-7 to: Set 1-8 to:

75 Up Up Up

1200 Up Up Down

2400 Up Down Up

4800 Up Down Down

7200 Down Up Up

9600 Down Up Down

14400 Down Down Up

19200 Down Down Down

Function Switch Two

Function switch two is an eight-segment DIP switch used to set control­signal contention, select synchronous or asynchronous data format,
select or bypass the retiming buffer, enable or disable anti-streaming, set
the clock signal routing, set main channel RTS on DCD transparent or
on, and set main channel inbound CTS transparent or on.

Table 3-3. Function Switch Two Summary

Function

Switch

2-1 Up

2-2 Up

2-3 Up

2-4 Up

2-5 and 2-6 See Table 3-4 These two switches work together to set Clock

Switch

Position Function

Sets Control Signal Contention

Down

Down

Down

Down

Sets Data Contention

Sets synchronous data format
Sets asynchronous data format

Synchronous Data Retiming Buffer in circuit
Synchronous Data Retiming Buffer bypassed

Disables Anti-Streaming
Enables Anti-Streaming

Routing

3-4

Telenetics 2185

Table 3-3. Function Switch Two Summary

Function

Switch

2-7 Up

2-8 Up

Switch

Position Function

Sets main channel RTS or DCD transparent

Down

Down

Straps main channel RTS or DCD ON

Straps main channel inbound CTS ON
Sets main channel inbound CTS transparent

In certain synchronous configurations, the internal clock generator is
not used and the data rate is determined by the selected external clock
source. (For details, refer to the section on function switch segments 2-5
and 2-6 - Clock Routing.) The internal clock generator is also used in
asynchronous applications when Data Contention is selected.

Switch Segment 2-1 — Contention Mode

• Switch 2-1 set to up position – Control Signal Contention

• Switch 2-1 set to down position – Data Contention

In applications where the subchannel devices toggle control signals, set
this switch to the up position for Control Signal Contention. Where
active control signals are not provided, set to the down position for Data
Contention. This selects the RTS or DCD control signal for contention,
depending on whether the subchannel is configured as a DTE or DCE.
When Data Contention mode is selected, switch segments 2-7 and/or 2­8 must be strapped ON.

Switch Segment 2-2 — Data Format

• Switch 2-2 set to up position – Synchronous format

• Switch 2-2 set to down position – Asynchronous format

Set this switch to the up position for Bisynchronous or HDLC applica­tions (synchronous operation). When set to the down position, (asyn­chronous operation selected), the retiming buffer is bypassed.

Switch Segment 2-3 — Synchronous Data Retiming Buffer

• Switch 2-3 set to up position – Normal

• Switch 2-3 set to down position – Buffer bypassed

When the 2185 is configured for asynchronous data format (function
switch 2-2 is set to the down position), that switch may be ignored.

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Telenetics 2185

With synchronous data transmission, the data retiming buffer must be
used except when all subchannels are connected to DTE devices. The
data retiming buffer may then be bypassed to permit passing Bisynchro­nous multiple messages in Data Contention mode.

Switch Segment 2-4 — Anti-Streaming Enable/Disable

• Switch 2-4 set to up position – Anti-Streaming Disabled

• Switch 2-4 set to down position – Anti-Streaming Enabled

Enabling Anti-Streaming limits a subchannel message to 25 seconds. If
subchannel messages are greater than 23 seconds in length, anti-stream­ing should be disabled.

Switch Segment 2-5 and 2-6 — Clock Routing

When the 2185 is configured for asynchronous data format switches 2-5
and 2-6 are ignored.

If the 2185 is configured for synchronous data format, switches 2-5 and
2-6 are used to select the master clock source. The network may be
clocked from the main channel device, the 2185's internal clock, or the
Subchannel 1 device if it is a DCE device.

Switch segments 2-5 and 2-6 much be set as described in Table 3-4.
Note that only the configurations listed in Table 3-2 are valid; all other
combinations are illegal and result in errors.

When the 2185 is configured for subchannel 1 DCE clock timing (Fig­ures 3-7 and 3-8), the 2185 uses the Receive Clock signal of the DCE
for timing. Should DCE's clock signal fail, the Clock Alarm on the 2185
illuminates and the 2185 reverts to its own internal oscillator.

Table 3-4. Clock Routing Configurations

Fig Ref.

3-3/4 Main Channel X Up Down

3-5/6 Internal X Down Down

3-7/8 Sub Ch. 1 DCE Down Up

Clock

Source Subchannel 1 Set 2-5 to Set 2-6 to

Note: X = does not matter

3-6

Telenetics 2185

Switch Segment 2-7 — Main Channel RTS/DCD Strapping

• Switch 2-7 set to up position – RTS/DCD transparent

• Switch 2-7 set to down position – RTS/DCD strapped ON

When switch segment 2-7 is set for transparent RTS/DCD operation, the
main channel outbound RTS or DCD signal is ON only when a subchan­nel is active.

When switch segment 2-7 is set to the down position, the main channel
RTS/DCD is strapped ON at all times.

Switch Segment 2-8 — Main Channel CTS Strapping

• Switch 2-8 set to up position –CTS strapped ON

• Switch 2-8 set to down position – CTS transparent

This switch is ignored when the main channel is connected to a DTE
device.

If the 2185 is set for CTS strapped ON, CTS is sent to a contending sub­channel DTE device as soon as the main channel is available.

When switch segment 2-8 is set for transparent CTS, the CTS signal is
not set to a contending subchannel DTE device until CTS has been
received ON from the main channel device. See Figures 3-3 through
3-8.

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Telenetics 2185

Figure 3-3. External Clock Reference with Main Channel DTE

3-8

Telenetics 2185

Figure 3-4. External Clock Reference with Main Channel DCE

3-9

Telenetics 2185

Figure 3-5. Internal Clock Reference with Main Channel DTE

3-10

Telenetics 2185

Figure 3-6. Internal Clock Reference with Main Channel DCE

3-11

Telenetics 2185

Figure 3-7. Subchannel 1 DCE Clock Reference with Main

Channel DTE

3-12

Telenetics 2185

Figure 3-8. Subchannel 1 DCE Clock Reference with Main

Channel DCE

3-13

Telenetics 2185

Function Switch Three

Function switch three is a six-segment DIP switch used to configure the
data interfaces for each channel.

Set to Up (DTE) if the channel is connected to a DTE-type device such
as a CPU port or a terminal (this configures the 2185 interface as Data
Circuit-terminating Equipment - DCE).

Set down (DCE) if the channel is connected to a DCE-type device such
as a modem (this configures the 2185 interface as Data Terminal Equip­ment - DTE).

Table 3-5. DTE/DCE Optioning

Position Sw3-1 Sw3-2 Sw3-3 Sw3-4 Sw3-5 Sw3-6

Up Main Ch.

DTE

Down Main Ch.

DCE

Sch. 1
DTE

Sch. 1
DCE

Sch. 2
DTE

Sch. 2
DCE

Sch. 3
DTE

Sch. 3
DCE

Sch. 4
DTE

Sch. 4
DCE

Sch. 5
DTE

Sch. 5
DCE

LED INDICATORS

Table 3-6 lists the functions of the LED status indicators. Under normal
operating conditions, none of the alarm indicators is illuminated. Refer
to the section entitled Recovery From Anti-Streaming Alarm Condition
in Chapter 4 - Maintenance for the procedure to handle alarms.

CONFIGURATION EXAMPLES

The following examples show how you might option your 2185 for a
variety of configurations. These examples are provided to demonstrate
the versatility of the 2185. Your specific application, and thus product
configuration, may differ from those described here. For an explanation
of the various switches, refer to the function switch descriptions in the
previous sections.

3-14

Telenetics 2185

Digital Bridging Application Example

One of the most common applications for your 2185 is as a digital
bridge. In this instance, a 2185 is used to connect a large number of
local and remote asynchronous terminals to a mainframe computer at a
central site. Figure 3-9 shows this application.

In this application, the main channel of the 2185 connects to a host com­puter through a front-end processor. The data rate is 9. 6 kbps and the
format is synchronous. Since the main channel is connected to a DTE­type device, the main channel on the 2185 is set to DTE.

All three subchannels are set to operate at 9. 6 kbps, as they must be the
same as the main channel. Subchannels one and two are set to DTE,
since they are connected directly to controllers. Subchannel three is set
to DCE, as it connects to a modem. The following charts show the cor­rect switch settings for this particular application.

3-15

Telenetics 2185

Figure 3-9. 2185 Digital Bridging Application

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Telenetics 2185

Table 3-6. Switch One

Switch

Segment Setting Reason

1-1 Down Enable Subchannel 1

1-2 Down Enable Subchannel 2

1-3 Down Enable Subchannel 3

1-4 Up Disable Subchannel 4

1-5 Up Disable Subchannel 5

1-6 Down The settings of these three

1-7 Up

1-8 Down

switches set the data rate
(9. 6 kpbs)

Table 3-7. Switch Two

Switch

Segment Setting Reason

2-1 Up Control Signal Contention

2-2 Up Synchronous operation

2-3 Up Retiming Buffer on

2-4 XX Depends on line conditions

(typically set to down)

2-5 Down Internal clock source

2-6 Down

2-7 Down RTS/DCD on all the time

2-8 XX Doesn't care (Main Ch DTE)

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Telenetics 2185

Table 3-8. Switch Three

Switch

Segment Setting Reason

3-1 Up Main Channel connection to DTE

3-2 Up Subchannel one connection to DTE

3-3 Up Subchannel two connection to DTE

3-4 Down Subchannel three connection to DCE

3-5 XX Subchannel four not used

3-6 XX Subchannel five not used

Leased-Line Backup Application Example

Another common application example for your 2185 is the Leased-Line
Backup application. In this example, the 2185 is again used to connect a
mainframe to remote users. The primary connection is through a digital
network via DSUs (Digital Service Units). The backup route is through
leased-lines via dial modems. Figure 3-10 shows this application.

3-18

Telenetics 2185

Figure 3-10. 2185 Leased-Line Backup Application

3-19

Telenetics 2185

In this application the main channel of 2185 A is connected to a host
computer through a front-end processor. The data rate is 9. 6 kbps and
the format is synchronous. Since the main channel is connected to a
DTE type device the main channel on 2185 A is set to DTE.

Two subchannels are connected to 2185 B through two networks. One
rout is through a digital network and the backup route is through a com­mon telephone network. Subchannels one and two of both 2185 A and
2185 B are set to DCE as that is the type of device to which they are
connected. The main channel of 2185 B is set to DTE since it is con­nected to the controller. Clocking in this network is derived from the
DSU connected to Subchannel One.

The following tables show the correct switch settings for this particular
application and apply to both 2185s.

Table 3-9. Switch One

Switch

Segment Setting Reason

1-1 Down Enable Subchannel 1

1-2 Down Enable Subchannel 2

1-3 Up Disable Subchannel 3

1-4 Up Disable Subchannel 4

1-5 Up Disable Subchannel 5

1-6 Down The settings of these three

1-7 Up

1-8 Down

switches set the data rate
(9. 6 kpbs)

3-20

Telenetics 2185

Table 3-10. Switch Two

Switch

Segment Setting Reason

2-1 Down Data Contention

2-2 Up Synchronous operation

2-3 Up Retiming Buffer on

2-4 XX Depends on line conditions

2-5 Down Clock source from

2-6 Up Subchannel One DSU

2-7 Down RTS/DCD on all the time

2-8 XX Doesn't matter (Main Ch DTE)

Table 3-11. Switch Three

Switch

Segment Setting Reason

3-1 Up Main Channel connection to DTE

3-2 Down Subchannel one connection to DCE

3-3 Down Subchannel two connection to DCE

3-4 XX Subchannel three not used

3-5 XX Subchannel four not used

3-6 XX Subchannel five not used

3-21

Telenetics 2185

Multimaster Multidrop Application Example

In this application, 2185s are used to provide a link between remote
users and two mainframes, with the second mainframe serving as the
backup for the first. Figure 3-11 shows this application.

SCH. 4

Figure 3-11. Multimaster Multidrop Application

3-22

Telenetics 2185

In this application, the main channel of both 2185 A and 2185 B are con­nected via a straight-through cable with the 2185 A main channel set to
DTE and the 2185 B main channel set to DCE. The data rate is 1.2 kpbs
asynchronous so clocking is not an issue. Subchannel one of 2185 A is
connected directly to the local host computer and is set to DTE. Sub­channel two is connected via a modem link to the backup computer
installation and is set to DCE.

All five subchannels of 2185 B are connected to external devices with
subchannels one, two, and four set to DTE and subchannels three and
five set to DCE.

The following tables show the switch settings for 2185 A first and then
for 2185 B.

Table 3-12. Switch One Settings – 2185 A

Switch

Segment Setting Reason

1-1 Down Enable Subchannel 1

1-2 Down Enable Subchannel 2

1-3 Up Disable Subchanel 3

1-4 Up Disable Subchannel 4

1-5 Up Disable Subchannel 5

1-6 Up The settings of these three

1-7 Up

1-8 Down

switches set the data rate
(9. 6 kpbs)

3-23

Telenetics 2185

Table 3-13. Switch Two Settings – 2185 A

Switch

Segment Setting Reason

2-1 Up Control Signal Contention

2-2 Down Asynchronous operation

2-3 XX Does not matter; on for sync only

2-4 XX Depends on line conditions

2-5 XX Does not matter, since unit is set

2-6 XX

2-7 Down RTS/DCD on all the time

2-8 XX Does not matter (Main Ch DTE)

for async. operation

Table 3-14. Switch Three Settings – 2185 A

Switch

Segment Setting Reason

3-1 Up Main Channel connection to DTE

3-2 Up Subchannel one connection to DTE

3-3 Down Subchannel two connection to DCE

3-4 XX Subchannel three not used

3-5 XX Subchannel four not used

3-6 XX Subchannel five not used

Table 3-15. Switch One Settings – 2185 B

Switch

Segment Setting Reason

1-1 Down Enable Subchannel 1

1-2 Down Enable Subchannel 2

1-3 Down Enable Subchannel 3

1-4 Down Enable Subchannel 4

1-5 Down Enable Subchannel 5

1-6 Up The settings of these three

1-7 Up

1-8 Down

switches set the data rate
(1. 2 kpbs)

3-24

Telenetics 2185

Table 3-16. Switch Two Settings – 2185 B

Switch

Segment Setting Reason

2-1 Down Data Contention

2-2 Down Asynchronous operation

2-3 XX Does not matter, since the unit is on for

2-4 XX Depends on line conditions

2-5 XX Doesn't matter, since the unit is set for

2-6 XX

2-7 Down RTS/DCD on all the time

2-8 Up CTS on all the time

sync only

async. operation

Table 3-17. Switch Three Settings – 2185 B

Switch Setting Reason

3-1 Down Main Channel connection to DCE

3-2 Up Subchannel one connection to DTE

3-3 Up Subchannel two connection to DTE

3-4 Down Subchannel three connection to DCE

3-5 Up Subchannel four connection to DTE

3-6 Down Subchannel five connection to DCE

3-25

Telenetics 2185

Table 3-18. LED Status Indicator Functions

LED Indicator Function

SYSTEM
POWER

CLOCK FAIL
ALARM

MAIN CHANNEL

DATA Illuminates when the main channel inbound data is a

RDY (

Ready

SUBCHANNELS 1 TO 5

ACTIVE Illuminates when the subchannel indicated gains access to

ALARM Alarm illuminates for a channel that Is automatically dis-

Illuminates when the unit powers up

Illuminates when the 2185 derives its clock signal from
Subchannel 1 DCE and the clock input fails

SPACE

) Illuminates when the main channel inbound DSR or DTR

is ON

the main channel

abled by the anti-streaming timer. Under normal operating
conditions, all of these LED indicator lamps should be
extinguished.

MAIN POWER CONNECTION

115 Volt Models - 115V ac models use a wall-mount transformer (Prod­uct Code 28410?) equipped with a North American plug.

(An appropriate adapter may be used in other countries supplying 115V
ac line voltage.) This supply allows operation on 100 V ac systems.

230 Volt Models - 230 V ac models use a desktop transformer (Product
Code 28413?) equipped with a CEE7/7 plug. (An appropriate adapter
may be used in other countries supplying 230 V ac line voltage.)

Others - If the above power arrangements are not applicable to your
country, the 2185 requires a fused power supply: 24 V ac ± 10%, 50 to
60 Hz, center-tapped, at 0. 2A (order Cable Product Code 28415?).

3-26

Telenetics 2185

Alternative power supplies that were not approved at the time of this
publication may be available; consult your local distributor for special
requirements.

Figure 3-12. 2185 - Power Connection

3-27

Telenetics 2185

OPERATION

Once you successfully power-up your 2185, it is fully operational and
does not require any further initialization procedures.

Once configured, your 2185 operates unattended without operator inter­vention. Occasional monitoring of the LED status indicators is
recommended.

POWER-DOWN PROCEDURE

Proceed as follows to power-down your 2185.

Remove the ac power cord from the primary ac power source. Your
2185 retains its previous configuration when powered-up again.

3-28

Chapter 4

Operation and Configuration

MAINTENANCE PHILOSOPHY

Preventive Maintenance

There is no preventive maintenance necessary on your Telenetics 2185
other than the occasional removal of dust that a have settled on the unit.
Use a soft cloth to remove dust that may have built up on the outside of
the unit.

Corrective Maintenance

There are no user-repairable components in the 2185. The 2185 is
designed to provide maximum up-time. In the event that repairs are
required, Telenetics Corporation or an authorized Telenetics representa­tive should perform them. Field repair of defective units or modules is
not recommended.

You can reach Telenetics by calling [phone] or through our Web
site at http://www.telenetics.com.

Recovery from Anti-Streaming Alarm Condition

If a subchannel anti-streaming alarm indication occurs, disable the
affected channel using the appropriate FUNCTION Switch (1-1 to 1-5;
refer to Chapter 3 - Operation). Correct the fault in the subchannel
device and restore it to the network by re-enabling the subchannel.

4-1

Telenetics 2185

If all equipment in the network is functioning properly and anti-stream­ing alarms are occurring, the probable cause is that the subchannel
devices are sending valid messages longer than 23 seconds. If this is the
case, disable anti-streaming.

RETURNING DEFECTIVE EQUIPMENT FOR REPAIR

General Packing Information

When returning defective equipment to Telenetics or an authorized
Telenetics representative for repair, pack the equipment using the fol­lowing guidelines.

1. Do not mark the equipment. Enclose a shipping list identifying each

item by serial/part number. Defective units should have tags attached
indicating product name and description, product serial number, cus­tomer order number, the malfunction or failure indication, and the return
address.

2. Wherever possible, re-use the original packing material and shipping

container.

3. Secure movable and exposed parts before shipment so that they don't

come loose in shipment and cause or sustain damage.

4. Materials that are abrasive, flake-off or produce dust must not be used

for cushioning.

Installations in the USA

When returning defective equipment to Telenetics for factory repair,
customers in the USA should contact the Telenetics Return Services
Coordinator, at the following number, for return authorization and
instructions:

Tel: [phone]
Web site: http://www.telenetics.com

4-2

Telenetics 2185

When contacting Telenetics, you receive a Telenetics Return Material
Authorization (RMA) Control Number. This RMA Control Number
should be clearly marked on the return equipment shipping container(s)
for easy identification and faster service. The RMA Control Number is a
shipment control tool and does not affect the provisions of a Sales or
Lease agreement. You need to supply the following information for each
piece of equipment returned:

• Product Name and Description

• Product Serial Number

• Customer Order Number

• Failure Symptoms

When possible, include a purchase-order number for billing purposes.
After packaging the defective materials, ship them prepaid to:

Telenetics Corporation
25111 Arctic Ocean
Lake Forest, California 92630

Installations Outside the USA or Canada

Customers outside the USA and Canada should return defective units to
Telenetics Corporation at the above address. Before shipping the unit,
obtain a Return Authorization Number and the Return Procedure from
Telenetics Corporation. The Return Procedure outlines the appropriate
Canadian Customs documentation and information that must accom­pany each return shipment.

4-3

Telenetics 2185

4-4

Chapter 5

Ordering Information

INTRODUCTION

This chapter provides Telenetics product and ordering information for
the 2185.

Ordering Information

Table 5-1 lists Telenetics 2185 products for and accessories. Any of the
items listed may be ordered from your authorized Telenetics representa­tive.

Table 5-1. Telenetics Ordering Information

Item Product Code Description

Standalone Units

2185 28500 115V ac, 50/60 Hz

2185 28501 230V ac, 50/60 Hz

2185 28502 14V ac (no transformer)

2185 Components

28504 5 channel nest card

28506 2185 Enclosure

28410 115 V ac power supply

28413 230 V ac power supply

Documentation

Operator's Guide 28510 User’s Installation/Operation

manual

5-1

Telenetics 2185

5-2

Glossary

This glossary defines terms used in the 2185 Operator's Guide.

ACTIVE LED indicator lamp that illuminates when the

ALARM LED indicator lamp that illuminates when the anti-

Anti-Streaming Scheme that protects the network from becoming

Anti-Streaming
Time-out

Cascading The 2185 may be cascaded to increase the number

Co-Located Terminals Using the 2185, any combination of subchannel

subchannel indicated gains access to the main
channel.

streaming timer automatically disables a
subchannel.

jammed should one of the subchannel devices fail.
If the selected subchannel remains active for longer
than the anti-streaming time-out period it's
automatically disabled and its alarm LED indicator
lights up.

Nominally 25 seconds in the 2185.

of channels that can be connected to the main
channel controller. Cascading is accomplished by
connecting the main channel of one unit to a
subchannel of another unit. The cascaded units may
be located at one site or the units may be located at
sites remote from each other, and be connected
through modems.

DTE devices and subchannel DCE devices is
possible. For example, local subchannel terminals
can be co-located with modems that communicate
with devices at remote sites. Co-location of ports
and modems can be performed in both port-sharing
and modem-sharing operation modes.

Contention In communications, the case where multiple users

vie for the right to use a transmission channel on a
first-come first-serve basis, whether a PBX circuit, a
computer port, or a time slot within a multiplexed
facility.

Glossary-1

Telenetics 2185

Controller Device responsible for polling terminals and routing

Control Signal
Contention Mode

DATA LED indicator lamp that illuminates when the main

Data Contention Subchannels contend for use of the main channel to

Modem-Sharing In the modem-sharing mode, the CPU or controller

messages in a multipoint environment.

Subchannels contend for use of the main channel to
send data to the CPU or controller. In the control
signal contention mode, subchannel devices contend
by raising control signal RTS if the device is a DTE,
or control signal DCD if the device is a DCE. The
2185 DSD returns CTS to a selected subchannel
device. The selected subchannel disconnects from
the main channel when the subchannel device drops
RTS or DCD.

channel inbound data is a SPACE.

send data to the CPU or controller. In the data
contention mode, a subchannel contends for access
to the main channel by sending data (beginning with
a space bit). The selected subchannel disconnects
from the main channel after 16 consecutive mark
bits are detected.

is at a site remote from the 2185. The 2185's main
channel connects to the CPU through a modem link
(DCE). Subchannel terminals are connected
directly to the 2185 DSD.

Multipoint A communications arrangement where multiple

Port Physical point of access into a computer, a network,

Port-Sharing In the port-sharing mode, the 2185's main channel is

devices share a common transmission channel,
though only one device may transmit at a time.
Such networks usually require some kind of polling
mechanism, which is under the control of a master
station, to ensure that only one device transmits data
at a time. Also known as a multidrop network.

or other electronic device.

connected directly to a CPU or controller port
(DTE). Subchannel devices communicate with the
2185 DSD via modem links.

Glossary-2

Telenetics 2185

RDY Ready. LED indicator lamp that illuminates when

Straight-Through
Cable

Subchannel
Contention

Synchronous
Retiming Buffer

the main channel inbound DSR or DTR is ON.

Cable terminated with 25-pin EIA connector at each
end. Connections are made on a pin-to-pin basis.
See Figure 2-2.

Subchannels contend for use of the main channel to
send data to the CPU or controller. If more than one
subchannel tries to access the main channel at one
time, the 2185 selects one subchannel and blocks
data from all the others. You may select either of
two contention modes — either data contention or
control signal contention.

When operating in a synchronous data environment,
the 2185 uses an internal ±4-bit buffer to retime
inbound subchannel data to the main channel clock.
The buffer compensates for phase differences
between the subchannel and main channel clocks
and can absorb clock jitter and minor differences in
frequency.When the 2185 is configured for
asynchronous operation, the retiming buffer is
bypassed.

Glossary-3

Telenetics 2185

Glossary-4

A

Anti-streaming 1-3
Anti-streaming alarm, recovery 4-1
Applications 1-3

cascading the 2185 1-6, 1-8
co-located terminals 1-6
modem-sharing mode 1-5
port-sharing mode 1-4

C

Cabling 2-3
Cascading the 2185 1-6, 1-8
Co-located terminals 1-6
configuration defined 3-1
Configuration examples 3-14

digital bridging 3-15
leased-line backup 3-18

multimaster multidrop 3-22
Corrective maintenance 4-1
Customer responsibilities 2-1

D

Damage 2-2
Data interface 1-1
Digital bridging application 3-15

E

Equipment assembly 2-3
Equipment supplied 2-2

Index

F

Features 1-1

anti-streaming 1-3

Data interface 1-1

Main channel broadcast 1-2

subchannel contention 1-2

synchronous data retiming buffer 1-2
Front panel 3-2
Front view 3-1
Function switches 3-3

switch one 3-3

switch three 3-14

switch two 3-4

G

General packing information 4-2
Glossary 1

INDEX-1

Index (continued)

I

Indicators 3-1
Inside front panel 3-2
Installation procedure 2-3

cabling 2-3

equipment assembly 2-3

mechanical 2-3

required tools 2-3
Installation tools 2-3
Installations

outside USA or Canada 4-3

USA 4-2

L

Leased-line backup application 3-18
LED indicators 3-14

M

Main channel broadcast 1-2
Main power connection 3-26
Maintenance

corrective 4-1

preventive 4-1
Material shortages 2-2
Mechanical installation 2-3
Modem-sharing mode 1-5
Multimaster multidrop application 3-22

O

Operating controls 3-1
Operation 3-28
Ordering information 5-1

P

Packing materials 2-2
Port-sharing mode 1-4
Power-down procedure 3-28
Preventive maintenance 4-1

R

Recovery from anti-streaming alarm 4-1
Returning defective equipment for repair 4-2

S

Site

selection 2-1

INDEX-2

Site preparation 2-1
Specifications 1-9
Subchannel contention 1-2
Switches 3-3

switch one 3-3

switch three 3-14

switch two 3-4
Synchronous data retiming buffer 1-2

U

Unpacking 2-2

Index (continued)

INDEX-3

Index (continued)

INDEX-4