USER
MANUAL
MODEL 1184 &
MODEL 1185
Kilolight
™ Single Fiber
Modems
SALES OFFICE
(301) 975-1000
TECHNICAL SUPPORT
(301) 975-1007
http://www.patton.com
Part# 07M1185-C
Doc# 035011U-C
Revised 08/16/99
An ISO-9001
Certified
Company
TABLE OF CONTENTS
Section
Page
1.0 Warranty Information.............................................................2
1.1 Radio and TV Interference
1.2 CE Notice
1.3 Service
2.0 General Information...............................................................4
2.1 Product Features
2.2 General Product Description
3.0 Configuration .........................................................................5
3.1 Configuration Switch S1
4.0 Installation .............................................................................9
4.1 Connection to Fiber Interface
4.2 Connection to the Serial Port
4.3 Power Connection
5.0 Operation.............................................................................14
5.1 Power- Up
5.2 LED Status Monitors
5.3 Test Modes
Appendix A - Specifications
Appendix B - Factory Replacement Parts and Accessories
Appendix C - Interface Pin Assignments
1
1.0 WARRANTY INFORMATION
Patton Electronics warrants all Model 1184 and 1185
components to be free from defects, and will—at our option—repair or
replace the product should it fail within one year from the first date of
shipment.
This warranty is limited to defects in workmanship or materials,
and does not cover customer damage, abuse or unauthorized
modification. If this product fails or does not perform as warranted,
your sole recourse shall be repair or replacement as described above.
Under no condition shall Patton Electronics be liable for any damages
incurred by the use of this product. These damages include, but are
not limited to, the following: lost profits, lost savings and incidental or
consequential damages arising from the use of or inability to use this
product. Patton Electronics specifically disclaims all other warranties,
expressed or implied, and the installation or use of this product shall be
deemed an acceptance of these terms by the user.
1.1 RADIO AND TV INTERFERENCE
The Model 1184 and 1185 generate and use radio frequency
energy, and if not installed and used properly—that is, in strict
accordance with the manufacturer's instructions—may cause
interference to radio and television reception. The Model 1184 and
1185 have 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 from such interference in a commercial installation.
However, there is no guarantee that interference will not occur in a
particular installation. If the Model 1184 or 1185 do cause interference
to radio or television reception, which can be determined by
disconnecting the unit, the user is encouraged to try to correct the
interference by one or more of the following measures: moving the
computing equipment away from the receiver, re-orienting the receiving
antenna and/or plugging the receiving equipment into a different AC
outlet (such that the computing equipment and receiver are on different
branches).
1.2 CE NOTICE
The CE symbol on your Patton Electronics equipment indicates
that it is in compliance with the Electromagnetic Compatibility (EMC)
directive and the Low Voltage Directive (LVD) of the Union European
(EU). A Certificate of Compliance is available by contacting Technical
Support.
2
1.3 SERVICE
All warranty and non-warranty repairs must be returned freight
prepaid and insured to Patton Electronics. All returns must have a
Return Materials Authorization number on the outside of the shipping
container. This number may be obtained from Patton Electronics
Technical Service at (301) 975-1007, at our web site at
http://www.patton.com, or at support@patton.com.
NOTE: Packages received without an RMA number will not be
accepted.
Patton Electronics' technical staff is also available to answer any
questions that might arise concerning the installation or use of your
Model 1184 or 1185. Technical Service hours: 8AM to 5PM EST,
Monday through Friday.
2.0 GENERAL INFORMATION
Thank you for your purchase of this Patton Electronics product.
This product has been thoroughly inspected and tested and is
warranted for One Year parts and labor. If any questions or problems
arise during installation or use of this product, please do not hesitate to
contact Patton Electronics Technical Support at (301) 975-1007;
2.1 FEATURES
• Model 1184: Synchronous data rates: 4.8 - 128 kbps
Asynchronous data rates: 0-19.2 kbps
• Model 1185: Synchronous data rates: 2.4 - 256 kbps
Asynchronous data rates: 0 - 38.4 kbps
• Full duplex operation over a single
multi-mode fiber optic cable
• Point-to-point distances up to 3 miles
• Internal, external or receive recovered clocking options
• Field Replaceable DTE-DCE QuickConnect™ interface modules:
V.24/RS-232, V.35, RS-422/530, X.21 and G.703
• V.54 compliant local and Remote Digital Loopback tests
• 8 Front Panel LEDStatus Indicators
• Available with ST or SMA Fiber Connectors
• Made in the U.S.A.
2.2 DESCRIPTION
The Patton Model 1184 and 1185 are designed for high speed
RS-232 communication over a single multi-mode fiber. Operating up
to 128 kbps synchronous and 19.2 kbps asynchronous data rates,
Model 1184 is perfect for campus applications where data integrity is a
must. And Model 1185 is even faster at a bursty 256 kbps
synchronous or 38.4 kbps async.! Synchronous clocking options
include internal, external, or receive recovered clock.
Both Models 1184 and 1185 feature replaceable Patton’s DCEDTE QuickConnect™ interface modules. Available interfaces include
V.24/RS-232, V.35, RS-422/530, X.21, Ethernet Bridge and G.703.
Fiber connections are made using a ST or SMA type interface.
The Model 1184 and 1185 also incorporate V.54 compliant local
and remote loopback test modes that are activated by a convenient
front panel switch. LED status indicators monitor interface data and
control signals as well as test mode status. Available with options for
AC or DC power supply, the Models 1184 and 1185 conveniently fit in a
wide range of applications and power supply environments.
43
Switch S1-1 through S1-4
(Model 1184
:): Async/Sync Data Rate
On Model 1184 Switches S1-1, S1-2, S1-3 and S1-4 set two
parameters: synchronous or asynchronous data rate and the maximum
transmission distance between two Model 1184s.
Data Max. Distance
S1-1
S1-2 S1-3 S1-4 Rate (kbps) in miles (km)
On Off Off On 0-19.2 3.0 (4.8)
Off On On Off 4.8 3.0 (4.8)
Off On On On 9.6 3.0 (4.8)
On Off On Off 14.4 1.5 (2.4)
On Off On On 19.2 3.0 (4.8)
Off Off On Off 28.8 1.5 (2.4)
Off Off Off Off 32.0 3.0 (4.8)
Off On Off Off 56.0 1.5 (2.4)
Off Off Off On 64.0 3.0 (4.8)
On On On On 128.0 3.0 (4.8)
Position Function Factory Default
S1-1* Data Rate Off
S1-2* Data Rate Off
S1-3* Data Rate Off
S1-4* Data Rate On
S1-5 Clock Source On
S1-6 Clock Source On
S1-7 DTE Control of DL Off Disabled
S1-8 DTE Control of LAL Off Disabled
3.0 CONFIGURATION
Both Models 1184 and 1185 use a mini DIP switch package that
allows configuration to a wide range of applications. These switches
are located on the bottom side of the PC board. Figure 1 shows the
switch locations with respect to the other components on the PC board.
Because all eight switches are externally accessible, there is no need
to open the case to configure the unit.
3.1 CONFIGURATION SET “S1”
The switches shown in Figure 2 below and on DIP switch S1 are
used to set the async or sync data rates, LAL and DL diagnostic
functions and the clock mode setting. The default settings for DIP
switch S1 are shown in the table on page 6. Following the table are
detailed descriptions for each switch.
5
6
1184 AND 1185 S1 SUMMARY TABLE
}
64
kbps
Internal
}
}
Async
Setting
Sync
Settings
Figure 1. Underside of Model 1184/1185, Showing Location of DIP Switches
Figure 2. Close Up of Configuration Switches
ON
OFF
*NOTE: Both Models 1184 and 1185 use Switches S1-S4 to set the async or sync data
rate. Refer to the sections below to set the Model 1184 or 1185 rates.
12345678
ON
ON
12345678
Switch S1-1 through S1-4
(Model 1185)
: Async/Sync Data Rate
On Model 1185 Switches S1-1, S1-2, S1-3 and S1-4 set two
parameters: synchronous or asynchronous data rate and the maximum
transmission distance between two Model 1185s.
Data Max Distance
S1-1
S1-2 S1-3 S1-4 Rate (kbps) in miles (km)
On Off Off On 0-19.2 3.0 (4.8)
On Off Off Off 0-38.4 1.5 (2.4)
On On On Off 2.4 1.5 (2.4)
Off On On On 9.6 3.0 (4.8)
On Off On Off 14.4 1.5 (2.4)
On Off On On 19.2 3.0 (4.8)
Off Off On Off 28.8 1.5 (2.4)
Off Off On On 38.4 3.0 (4.8)
On On Off On 48.0 3.0 (4.8)
Off On Off Off 56.0 1.5 (2.4)
Off Off Off On 64.0 3.0 (4.8)
Off On On Off 72.0 1.5 (2.4)
Off Off Off Off 128.0 1.5 (4.8)
On On Off Off 144.0 1.5 (2.4)
Off On Off On 192.0 1.5 (2.4)
On On On On 256.0 1.5 (2.4)
7
Switches S1-5 and S1-6: Clock Source
Switches S1-5 and S1-6 are set in combination to determine Model
1184 and 1185 transmit clock source.
S1-5
S1-6 Setting Description
On Off Internal Transmit clock
generated internally
On On Internal Transmit clock
generated internally
Off On External Transmit clock derived
from terminal interface
Off Off Received Recover Transmit clock derived
from the received line
signal
NOTE: Because communication between two Model 1185s is
always synchronous, you must set these switches whether your
application is async or sync. For X.21 or Async applications,
please configure one unit for internal clock mode and the other for
receive recover clock mode.
Switch S1-7: DTE Control of DL
The setting for Switch S1-7 determines whether DTE control of
remote digital loopback test is enabled or disabled. If DTE control is
disabled, the DL test can only be initiated by the front panel switch. If
DTE control is not available, set switch S1-7 to the Off position.
S1-7
Setting Description
On Enabled Respond to DL requests from DTE
Off Disabled Ignore DL requests from the DTE
Switch S1-8: DTE Control of LAL
The setting for switch S1-8 determines whether DTE control of
local analog loopback test is enabled or disabled. If DTE control is
disabled, the LAL test can only be initiated by the front panel switch. If
DTE control is not available, set switch S1-8 to the Off position.
S1-7
Setting Description
On Enabled Respond to LAL requests from DTE
Off Disabled Ignore LAL requests from the DTE
8
}
}
Async
Settings
Sync
Settings
4.0 INSTALLATION
Once the Model 1184 or 1185 is properly configured, it is ready to
connect to the fiber interface, to the serial port, and to the power
source. This section tells you how to make these connections.
4.1 CONNECTION TO THE FIBER INTERFACE
The Model 1184 supports communication between two terminal
equipment at distances to 3 miles (4.8km) and data rates to 128 kbps
(sync) or 19.4 kbps (async). Model 1185 also supports distances up
to 3 miles (4.8km), but at rates up to 256 kbps (sync) or 38.4 (async).
Figure 3 shows the position of the interface connectors on the Model
1184 or 1185 back panel.
These short range modems are designed to work in pairs. You will
need one at each end of single 50 or 62.5 micron multi-mode fiber
cable. The fiber cable connects to each Model 1184 or 1185 using
either an ST or an SMA connector. Figure 4 below shows a close-up of
both connector types.
9
4.2 CONNECTION TO THE SERIAL PORT
The serial port interface on the Model 1184 and 1185 uses
interchangeable QuickConnect™ Modules. Each QuickConnect™
Module has a 50-pin card edge connector on one side and a serial port
interface on the other. Figure 2 below shows how a QuickConnect™
Module plugs into the back of the Model 1184/1185.
4.2.1 Changing QuickConnect™ Modules
When you purchase a particular version of the Model 1184 or
1185, it should be shipped to you with the appropriate QuickConnect™
Module already installed. If you need to install a different
QuickConnect™ Module, follow these steps:
Removing the Existing QuickConnect™ Module
1) Turn the power switch off. Leave the power cord plugged into a
grounded outlet to keep the unit grounded.
2) Loosen the two thumbscrews on the module by turning them
counterclockwise.
3) Grasp the two thumbscrews and gently pull the module from
the unit. Apply equal force to the thumbscrews to keep the
module straight during the removal process.
10
Figure 5. Installation of Model 1184/1185 Plug-in Serial Interface Module
Figure 4. Close-up of ST and SMA Connectors
Figure 3. Rear Panel of Model 1184/1185, Showing Interface and Power Connectors
Fiber
Line
1 On
0 Off
Quik-Connect
Interface Module
Interface Port
Line
SMA
ST
Interface Port
1 ON
0 OFF
Installing the New QuickConnect™ Module
1) Make sure the power switch is off. Leave the power cord
plugged into a grounded outlet to keep the unit grounded.
2) Hold the module with the faceplate toward you and align the
module with the guide slots in the rear panel of the Model
1184/1185.
3) While keeping the module’s faceplate parallel with the Model
1184/1185 rear panel, slide the module straight in–so that the
card edge contacts line up with the socket inside the chassis.
NOTE: The card edge connector should meet the socket when
it is almost all the way into the chassis. If you encounter a lot of
resistance, remove the module and repeat steps 2 & 3.
4) With the card edge contacts aligned with the socket, firmly seat
the module by using your thumbs to apply pressure directly to
the right and left edges of the module faceplate. Applying
moderate and
even
pressure should be sufficient to seat the
module. You should hear it “click” into place.
5) To secure the module in place, push the thumbscrews into the
chassis and turn the screws clockwise to tighten.
4.2.2 Connection to a “DTE” Device
The serial port on most QuickConnect™ interface modules (all
except the X.21 module) are hard-wired as DCE. Therefore these
modules “want” to plug into a DTE such as a terminal, PC or host.
When making the connection to your DTE device, use a straight
through cable of the shortest possible length—we recommend 6 feet
or less. When purchasing or constructing an interface cable, please
refer to the pin diagrams in Appendix D as a guide.
4.2.3 Connection to a “DCE” Device
The serial port on most QuickConnect™ interface modules is hardwired as a DCE (all except the X.21 module). Therefore you must use
a
null modem
cable when connecting to a modem, multiplexer or other
DCE device. This cable should be of the shortest possible length—we
recommend 6 feet or less. When purchasing or constructing a null
modem interface cable, use the pin diagrams in Appendix D as a
guide.
NOTE: Pin-out requirements for null modem applications vary
widely between manufacturers. If you have any questions about a
specific application, contact Patton Technical Support at
(301) 975-1007; support@patton.com; or at http://www.patton.com.
11
4.2.4 Re-configuring the X.21 QuickConnect™ Module
The serial port on the X.21 QuickConnect™ Module is default
wired as a DCE, but may be switched to a DTE. This is done by
reversing the orientation of the DCE/DTE strap, as described below:
To reverse DCE/DTE orientation, remove the module according to
the instructions in Section 4.2.1. The DCE/DTE strap is located on the
bottom side of the module’s PC board. The arrows on the top of the
strap indicate the configuration of the X.21 port (for example, if the
DCE arrows are pointing toward the DB-15 connector, the X.21 port is
wired as a DCE). Reverse the DCE/DTE orientation by pulling the
strap out of its socket, rotating it 180º, then plugging the strap back into
the socket. You will see that the DCE/DTE arrows now point in the
opposite directions, showing the new configuration of the X.21 port.
Reinstall the module according to the instructions in Section 4.2.1.
4.3 POWER CONNECTION
The Model 1184/1185 is available with three power supply options:
Standard AC Power Supply option (Model 1184/1185, or
1184/1185-230) is switchable between 100 and 253 VAC and is
available with a variety of domestic and international power cords.
(See Appendix C).
Universal Interface AC Power Supply option (Model 1184/1185-
UI) operates in environments ranging from 85 to 256 VAC, with no re-
configuration necessary (see Appendix C for available domestic and
international power cords).
DC Power Supply option (Model 1184/1185-DC) operates in 48
VDC environments and is equipped with a 3-pin “terminal strip” style
connector.
4.3.1 Connecting to an AC Power Source
The two AC power supply options–Standard and Universal–are
equipped with a male IEC-320 power connection. A domestic (US)
power supply cord is supplied with the unit at no extra charge. To
connect the standard or universal power supply, follow these steps:
1) Attach the power cord (supplied) to the shrouded male IEC-320
connector on the rear of the Model 1184 or 1185.
2) Plug the power cord into a nearby AC power outlet.
3) Turn the rear power switch ON.
12
5.0 OPERATION
Once the 1184 or 1185 is properly configured and installed, it
should operate transparently. This sections describes power-up,
reading the LED status monitors, and using the built-in loopback tests
.
5.1 POWER-UP
To apply power to the Model 1184/1185, first be sure that you have
read Section 4.3, and that the unit is connected to the appropriate
power source. Then power-up the unit using the rear power switch.
5.2 LED STATUS MONITORS
The Model 1184 and 1185 feature eight front panel LEDs that
monitor power, the DTE signals, network connection and test modes.
Figure 6 (below) shows the front panel location of each LED. Following
Figure 6 is a description of each LEDs function.
TD & RD Glows red to indicate an idle condition of Binary
“1” data on the respective terminal interface signals.
Green indicates Binary “0” data.
RTS Glows green to indicate that the Request to Send
signal from the DTE is active.
CD Glows red if no carrier signal is being received from
the remote modem. Green indicates that the remote
modem’s carrier is being received.
DTR Glows green to indicate that the Data Terminal
Ready signal from the terminal is active.
ER Glows red to indicate the likelihood of a Bit Error in
the received signal.
TM Glows red to indicate that the Model 1185 has
been placed in Test Mode. The unit can be placed in
test mode by the local or remote user. For RDL, the
TM LED will only glow red on the local unit.
NS Glows red to indicate that the local Model 1184/1185
has not yet connected with the remote 1184/1185.
14
4.3.2 Connecting to a DC Power Source
The 48 VDC power supply option uses a 3-pin terminal block with
spring-type connectors. Please refer to the Model 1090 Series Service
Manual.
13
Figure 6. Model 1185 Front Panel
WARNING! There are no user-serviceable parts in the power
supply section of the Model 1184/1185. Voltage setting changes
and fuse replacement should only be performed by qualified
service personnel. Any questions may be answered by
contacting Patton Electronics Technical support at (301) 9751007; support@patton.com; or http://www.patton.com.
Model 1185 High Speed Single Fiber Modem
RDTD RTS CD DTR ERNS TM
TEST MODES
- Remote
- Normal
- Local
5.3 DIAGNOSTICS
Model 1184 and 1185 are equipped with V.54 diagnostics that may
be used to to evaluate the condition of the local and remote units, as
well as the twisted pair link between them: local loopback (LAL) and
remote digital loopback (DL).
5.3.1 Local Analog Loopback
The Local Analog Loopback (LAL) test checks the operation of the
local Model 1184 or 1185 and is performed separately on each unit.
Any data sent to the local Model 1184/1185 in this test mode will be
echoed (returned) back to the user device. (See Figure 7, below). For
example, characters typed on the keyboard of a terminal will appear on
the terminal screen.
To perform a Local Analog Loopback test, follow these steps.
1. Activate LAL either by moving the front panel toggle switch
DOWN to “Local”, or; by raising the appropriate signal on
the DTE interface. Once Local Analog Loopback is
activated, the Model 1184/1185’s transmit output is connected
to its own receiver. The test LED should glow.
NOTE: Although the local Model 1184/1185 cannot communicate with the remote
Model 1185/1185 in this mode, the synchronized connection between the two
modems remains intact.
2. Verify that the data terminal equipment is operating properly
and can be used for a test. If a fault is indicated, call a
technician or replace the unit.
3. Perform a BER (bit error rate) test on each unit using a
separate BER tester. If the BER test equipment indicates no
faults but the data terminal indicates a fault, follow the
manufacturer's checkout procedures for the data terminal.
Also, check the interface cable between the terminal and the
Model 1184/1185.
15
5.3.2 Remote Digital Loopback
The Remote Digital Loopback test checks the performance of both
the local and remote Model 1184/1185,
and
the communication link
between them. Any characters sent to the remote unit in this test mode
will be returned back to the originating device (see Figure 7).
To perform an DL test, follow these steps:
1. Activate DL. This may be done in one of two ways: First, by
moving the front panel toggle switch DOWN to “Remote”. Or,
second, by raising the DL signal on the terminal interface (for
pin numbers, see Appendix D).
2. Perform a BER (bit error rate) test on the system, using BER
testers on both ends.
3. If the BER test equipment indicates a fault and the Local
Analog Loopback test was successful for both Model 1184 or
1185s, you may have a problem with the line between the
units. You should inspect the line for proper connections.
Figure 7. Remote Digital Loop
16
Figure 7. Local Analog Loopback
Local Model 1184/1185
APPENDIX A
SPECIFICATIONS
Transmission: Asynchronous and Synchronous
Clocking: Internal, external or derived from receive
signal
Distance: 3 miles maximum (4.8km)
1184 Data Rates: Asynchronous: 0 to 19.2 kbps
Synchronous: 4.8, 9.6, 14.4, 19.2, 28.8,
32.0, 56.0, 64.0, 128.0 kbps
1185 Data Rates: Asynchronous: 2.4 to 38.4 kbps
Synchronous: 2.4, 9.6, 14.4, 28.8, 38.4,
56.0, 64.0, 72.0, 128.0, 144.0, 192.0, 256.0
kbps
Handshaking: Software (XON/XOFF) or hardware
(RTS/CTS). Both modes available at all times.
Connectors: Either ST or SMA
Link Budget: 12 dB (62.5 micron), 8 dB (50.0 micron)
Diagnostics: V.54 Compliant - Local Analog Loopback
and Remote Digital Loopback bit error rate
pattern
Fiber Modes: Single 50 or 62.5 micron core, multi-mode
fiber optic cable
LED Indicators TD, RD, RTS, DTR, ER, NS and TM
Interface
Modules: EIA RS-232/CCITT V.24, RS-232/530,
CCITT V.35, X.21, Ethernet Bridge and
G.703
Power: 115/230 VAC (switch selectable), 50/60 Hz,
5 Watts; 85V - 256 VAC, 50/60 Hz
(universal input option); 48 VDC (option). 5
Watts.
Regulatory FCC part 15 Class A
Compliance: UL 1950, EN60950
89/336/EEC, 73/23/EEC
IEC 825 Class 1 equipment
Temperature
Range: 0-50°C (32-122°F)
Altitude: 0-15,000 feet
Humidity: 5 to 95% non-condensing
Dimensions: 7.3” x 6.6” x 1.62” ( mm x mm x mm)
Weight: 2.02 lbs. 1.0 Kg
17
APPENDIX B
FACTORY REPLACEMENT PARTS
AND ACCESSORIES
Patton Model #
Description
IM1/A...............................V.24 with DB25F
IM1/B...............................RS422/RS530 with DB25F
IM1/C...............................V.35 with M34F
IM1/D...............................X.21 with DB15F
IM1/E...............................V.35 with DB25F
IM1/F...............................G.703 with RJ45
IM1/G...............................High Speed Async w/DB-25F
IM1/I ................................Ethernet Bridge
0805US ...........................American Power Cord
0805EUR.........................European Power Cord CEE 7
0805UK ...........................United Kingdom Power Cord
0805AUS.........................Australia/New Zealand Power Cord
0805DEN.........................Denmark Power Cord
0805FR............................France/Belgium Power Cord
0805IN.............................India Power Cord
0805IS.............................Israel Power Cord
0805JAP..........................Japan Power Cord
0805SW...........................Switzerland Power Cord
07M1090SVC..................Service Manual
18
APPENDIX C
V.35 Interface Pin Description
M/34 Female Connector
Pin #
Signal
B SGND (Signal Ground)
C RTS (Request to Send)
D CTS (Clear to Send)
E DSR (Data Set Ready)
F CD (Carrier Detect)
H DTR (Data Transfer Ready)
L LLB (Local Line Loop)
M TM (Test Mode)
N DL (Remote Digital Loop)
P TD(Transmit Data)
R RD (Receive Data)
S TD/ (Transmit Data-B)
T RD/ (Receive Data-B)
U XTC (External Transmit Clock)
V RC(Receive Timing)
W XTC/ (External Transmit Clock)
X RC/ (Receive Timing)
Y TC(Test Control-A)
AA TC/ (Test Control-B)
APPENDIX C
(cont)
RS-232, RS-530 and V.35 Interface Pin Description
(DB-25 Female Connector)
Pin #
Signal
1 FG (Frame Ground)
2 TD (Transmit Data)
3 RD (Receive Data)
4 RTS (Request to Send)
5 CTS (Clear to Send)
6 DSR (Data Set Ready)
7 SGND (Signal Ground)
8 CD (Carrier Detect)
9 RC/ (Receive Timing-B)
10 CD/ (Carrier Detect-B)
11 XTC/ (External Transmit Clock)
12 TC/ (Test Control-B)
13 CTS/ (Clear to Send)
14 TD/ (Transmit Data-B)
15 TC (Test Control-A)
16 RD (Receive Data)
17 RC (Receive Timing)
18 LLB (Local Line Loop)
19 RTS/ (Request to Send)
20 DTR (Data Transfer Rate)
21 DL (Remote Digital Loop)
22 DSR/ (Data Set Ready)
23 DTR/ (Data Transfer Rate)
24 XTC (External Transmit Clock)
25 TM (Test Mode)
19 20
APPENDIX C
(cont)
X.21 Interface Pin Description
(DB-15 Female Connector)
Pin #
Signal
1 . . . . . . . . . . . . Frame Ground
2 . . . . . . . . . . . . T (Transmit Data-A)
3 . . . . . . . . . . . . C (Control-A)
4 . . . . . . . . . . . . R (Receive Data-A)
5 . . . . . . . . . . . . I (Indication-A)
6 . . . . . . . . . . . . S (Signal Element
Timing-A)
7 . . . . . . . . . . . . BT (Byte Timing-A)
8 . . . . . . . . . . . . SGND (Signal Ground)
9 . . . . . . . . . . . . T/ (Transmit Data-B)
10 . . . . . . . . . . . C/ (Control-B)
11. . . . . . . . . . . . R/ (Receive Data-B)
12 . . . . . . . . . . . I/ (Indication-B)
13........................S/ (Signal Element
Timing-B)
14 .......................BT/ (Byte Timing-B)
21
22
APPENDIX C
(cont)
G.703 Interface Pin Assignment
(RJ45 8-Pin Modular)
Pin #
Signal
1 RD+ (Receive Data Tip)
2 RD- (Receive Data Ring)
3 Not Used
4 TD- (Transmit Data Ring)
5 TD+ (Transmit Data Tip)
6 Not Used
7 Not Used
8 Not Used
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