USER
MANUAL
MODEL 1180/35
Single Fiber V.35
Short Range Modem
SALES OFFICE
(301) 975-1000
TECHNICAL SUPPORT
(301) 975-1007
Part# 07M1180/35-B
Doc# 017071UB
Revised 4/20/98
An ISO-9001
Certified Company
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2.0 GENERAL INFORMATION
3.0 CONFIGURATION
Thank you for your purchase of this Patton Electronics product.
This product has been thoroughly inspected by Patton's qualified
technicians. 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.
The Model 1180/35 uses an eight switch package that allow s
configuration to a wide range of synchronous applications. Because all
eight switches are externally accessible (see Figures 1 and 2, below),
there is no need to open the Model 1180/35's case for configuration.
FRONT
2.1 FEATURES
• Communicates full duplex over a single multimode fiber
• Synchronous data rates to 256 Kbps
• Hardware and software flow control support
• Internal, external or received recover clock
• Distances to 1.5 miles (over 64 Kbps)
• Distances to 3 miles (64 Kbps and under)
• ST or SMA fiber connectors
• V.35 DTE interface with female M/34
• Local and remote loopback diagnostics
• Tri-State front panel LED indicators
• Made in USA
REAR
Figure 1. Switch Locations Underneath Model 1180/35
2.2 DESCRIPTION
ON
The Model 1180/35 Single Fiber V.35 Short Range Modem
accomplishes full duplex, point-to-point V.35 communication over a
single multimode fiber. Supporting synchronous data rates up to 256
Kbps, the Model 1180/35 automatically adapts to hardware or software
flow control, and can be set for internal, external or received recover
clocking.
OFF
Figure 2. Close-up of 1180/35 DIP Wwitch Package Showing OFF/ON Positions
The Model 1180/35 features extended data rate circuitry that allows
for single fiber distances up to 1.5 miles at data rates above 64 kbps, or
3 miles at data rates below 64 kbps. Both local and remote loopback
tests can be activated from the front panel, or from the V.35 interface.
The Model 1180/35 front panel incorporates LED indicators for TD, RD,
RTS, CD and power.
3.1 DETAILED SWITCH SETTINGS
The Model 1180/35’s configuration switches set data rate
(distance), sync clock source, and DTE control of the RDL and LAL test
modes. The table on the following page summarizes the default switch
settings for the Model 1180/35. Following this table is a detailed
description of each switch function.
Optical fiber may be connected to the Model 1180/35 using an ST or
SMA type interface. The V.35 DTE interface on the Model 1180/35 is a
female M/34 connector.
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S1-5 and S1-6: Clock Source
S1 SUMMARY TABLE
Function
Position
S1-1
S1-2
S1-3
S1-4
S1-5
S1-6
S1-7
S1-8
Factory Default
Switches S1-1 and S1-2 are set in combination to determine the
source of the transmit clock for the Model 1180/35.
Data Rate (Distance)
Data Rate (Distance)
Data Rate (Distance)
Data Rate (Distance)
Clock Source
Off
Off
64 kbps (2x)
S1-5
Off
S1-6
Off
Setting
Off
Received Recover Clock
Internal Clock
External Clock
Internal Clock
}
On
Off
On
On
Off
On
On
On
Internal
}
Clock Source
On
DTE Control of RDL
DTE Control of LAL
Off
Off
Disabled
Disabled
S1-7: DTE Control of RDL
The setting for switch S1-7 determines whether the V.35 DTE can
activate the RDL test by raising pin L. If DTE Control of RDL is
enabled, control from the front panel is disabled if there is no DTE
connected.
Switches S1-1 though S1-4: Data Rate (Distance)
Switches S1-1 through S1-4 are set in combination to determine
two configuration parameters: synchronous data rate and maximum
distance. Maximum distance is determined by the space between data
packets in the communication stream between two Model 1180/35s.
The "2X" setting doubles the space between data packets, when
compared with the normal "1X" setting, and therefore doubles the
maximum distance. A setting of "2X" facilitates communication
distances up to 3 miles, and is available at certain data rates up to 64
kbps. A setting of "1X" supports communication at the normal distance
of 1.5 miles.
NOTE: If DTE control is not avialable, set Switch S1-7 to off.
S1-7
On
Off
Setting
DTE control of RDL enabled
DTE control of RDL disabled
S1-8: DTE Control of LAL
The setting for switch S1-8 determines whether the V.35 DTE can
activate the LAL test by raising pin N. If DTE Control of LAL is enabled,
control from the front panel is disabled if there is no DTE connected.
S1-1
S1-2
S1-3
S1-4
Data Rate (Distance)
On
Off
On
On
Off
Off
On
Off
Off
Off
Off
On
Off
On
On
On
Off
Off
Off
Off
On
On
Off
On
Off
On
On
On
On
On
On
On
On
On
Off
Off
Off
On
Off
Off
Off
On
Off
On
Off
On
Off
On
On
Off
On
Off
Off
Off
On
On
2.4 (1X)
9.6 (2X)
NOTE: If DTE control is not available, set Switch S1-8 to off.
14.4 (1X)
19.2 (2X)
28.8 (1X)
38.4 (2X)
48.0 (2X)
56.0 (1X)
64.0 (2X)
72.0 (1X)
128.0 (1X)
144.0 (1X)
192.0 (1X)
256.0 (1X)
S1-8
On
Setting
DTE control of LAL enabled
DTE control of LAL disabled
Off
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4.0 INSTALLATION
5.0 OPERATION
Once you have configured each Model 1180/35 properly and
connected the fiber and V.35 cables, you are ready to operate the units.
This section describes reading the LED status monitors, power-up, and
using the built-in loopback test modes.
The Model 1180/35 is easy to install. After configuring the DIP
switches, simply connect the single fiber cable, hook up the V.35
interface, and plug the power supply adapter into the 1180/35. Figure 4
(below) shows the location of the interface connections on the Model
1180/35 rear panel.
5.1 LED STATUS MONITORS
The Model 1180/35 features six front panel status LEDs that
indicate the condition of the modem and communication link. Figure 6
(below) shows the front panel location of each LED.
Figure 4. Rear Panel of Model 1180/35 Showing Interface Connections
4.1 SINGLE FIBER CONNECTION
These short range modems are designed to work in pairs. You will
need one at each end of single multi-mode fiber cable. Depending
upon the data rate setting you select, your cable may be a maximum of
1.5 or 3 miles long. The fiber cable connects to each Model 1180/35
using either an ST or an SMA connector. Figure 5 (below) shows a
close-up of both connector types.
Figure 6. Front view of Model 1180/35
• The green "Power" LED glows if power is applied to the modem.
• The green "Test Modes" LED indicates that the modem is in a test
mode (local analog or remote digital).
• The "TD" and "RD" indicators blink red and green with data activity.
Red indicates a low V.35 logic level, green indicates a high V.35
logic level. Note: V.35 devices idle in a low state, so the LED will
glow red if the connections are correct and the V.35 device is in an
idle state.
alignment pin
faces down
Figure 5. Close-up of ST and SMA Connections
4.2 V.35 CONNECTION
• The "RTS" and "CD" indicators are also tri-state and will glow red for
a "low" signal or green for a "high" signal. RTS lights for an
incoming signal on V.35 pin C. CD lights for an incoming signal on
the line side, and the resulting output signal on V.35 pin F.
The Model 1180/35 is configured as a DCE. Therefore it “wants” to
DTE hardware such as a PC, host or terminal, using a straight through
V.35 cable. Connecting the Model 1180/35 to DCE hardware such as a
modem, multiplexer, or printer, requires a null modem V.35 cable.
Contact Patton Technical Support at (301) 975-1007 for more
information about constructing the appropriate null modem cable for
your application.
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5.2 POWER-UP / SYNCHRONIZATION
To perform a local loopback test, follow these steps:
Apply AC power to the Model 1180/35 by plugging the separate AC
power adapter first into the rear panel outlet of the Model 1180/35 and
then into an acceptable AC power outlet. There is no power switch on
the Model 1180/35: When the "power" LED is glowing steady, the
Model 1180/35 is powered up. Note: be sure the front panel toggle
switch on both Model 1180/35s is set to NORMAL.
A. Activate local loopback by moving the front panel toggle switch
DOWN to "Local". Once local loopback is activated, the Model
1180/35 transmit output is connected to its own receiver. The "test"
LED should glow. (Note: Even though the local Model 1180/35
cannot communicate with the remote Model 1180/35 in this mode,
the synchronized connection between the two modems remains
intact).
After both the local and remote 1180/35s are powered up, a
synchronization process must occur between the two modems before a
link can be established. Depending upon a number of factors, this
synchronization process can take as long as 60 seconds. Any time one
of the Model 1180/35s loses power (in a lightning storm, for example),
the local and remote units must re-synchronize before they can resume
data transmission. Note: If your application cannot tolerate a 60
second synchronization phase, turning the front panel "Test Modes"
switch to REMOTE and then back to NORMAL will synchronize the
units within 250 mS.
B. 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.
C. Perform a BERT (bit error rate) test on each unit. If the BERT test
equipment indicates no faults and the data terminal indicates a
fault, follow the manufacturer's checkout procedures for the data
terminal. Also check the V.35 interface cable between the terminal
and the Model 1180/35.
When both Model 1180/35s are powered up and passing data
normally, the following LED conditions will exist:
5.3.2 REMOTE LOOPBACK
• PWR = green
The remote loopback test checks the performance of the local and
remote Model 1180/35s, and the communication link between them
(see figure 7, on the following page). Any characters sent to the remote
1180/35 in this test mode will be returned back to the originating device.
For example, characters typed on the keyboard of the local terminal will
appear on the local terminal screen after having been passed to the
remote Model 1180/35 and looped back. To perform a remote loopback
test, follow these steps:
• TD & RD = flashing red and green
• RTS & DCD = green
• TEST = off
5.3 LOOPBACK TEST MODES
The Model 1180/35 offers two loopback test modes to evaluate the
condition of the modems and the communication link. These tests are
activated from the front panel.
A. Activate remote loopback by moving the front panel toggle switch
UP to "Remote". The "test" LED should glow.
B. Perform a BERT (bit error rate) test on the system.
5.3.1 LOCAL LOOPBACK
C. If the BERT test equipment indicates a fault, and the local
loopback test was successful for both Model 1180/35s, there may
be a problem with the fiber communication line connecting the
modems. You should test the fiber line for proper connections and
continuity.
The local loopback test checks the operation of the local Model
1180/35, and is performed separately on each unit. Any data sent to
the local Model 1180/35 in this test mode will be echoed back to the
user device. For example, characters typed on the keyboard of a
terminal will appear on the terminal screen.
(continued)
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APPENDIX A
TROUBLESHOOTING
SYMPTOM
PROBLEM
SOLUTION
1. Loose power
connection
1. Make sure the AC
connection is flush
LEDs do not light
when AC power
transformer is
2. Outlet is defective
2. Try a different outlet
plugged into wall
3. AC power cord is
defective
3. Remove the cord
from the outlet and
check for continuity
4. AC transformer is
not plugged into the
Model 1180/35
4. Have another cup of
coffee!
1. If CD is low,
possible
synchronization loss
1. Check for ongoing
power loss or break in
fiber if CD does not go
high within 60
Carrier Detect (CD)
LED is low
Figure 7. Local and Remote Loopback Test Modes
or
seconds
Carrier Detect (CD)
LED is high, but
1180/35s are not
communicating
5.4 POWER-DOWN
2. Test Mode switch is
in the wrong position
2. Be sure the Test
Mode switch is set to
NORMAL on both
Model 1180/35s
Turn off the Model 1180/35 by simply unplugging the AC power
adapter from the wall. There is no power switch on the Model 1180/35.
3. DIP switches are set
improperly
3. Check all DIP switch
settings, esp. Reset
and Data Rate,
against those in
Section 3; make sure
both 1180/35s are set
the same way
4. Fiber link is
4. Check the ST or
connected improperly
SMA connection on the
back of both 1180/35s
5. V.35 connections
are faulty or cables are
pinned wrong
5. Check V.35 cable
continuity and pinning
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SYMPTOM
PROBLEM
SOLUTION
APPENDIX B
Data passes, but
hardware flow
control doesn't
work
1. Switch 7 must be in
the ON condition for
hardware flow control
signals to pass
between 1180/35s;
both units must be set
the same way
1. Incorrect DIP switch
setting
PATTON MODEL 1180/35 SPECIFICATIONS
Transmission Format:
Synchronous
Range:
1.5 miles at all data rates, 3 miles at
specified data rates
1180/35s work in
async. mode, but
not sync. mode
1. Switch 8 (internal/
external clock) must
be set the same way
for both 1180/35s
1. Incorrect DIP switch
setting
Data rates:
2.4, 9.6, 14.4, 19.2, 28.8, 48, 38.4, 56,
64,128, 144, 192 and 256 Kbps
Interface:
ITU/CCITT V.35 (M/34 female)
Transmit Mode:
Single 62.5 or 50 µ core, multi-mode fiber
cable
Clocking:
Internal, external or received recovered
Handshaking:
Software (X-ON/X-OFF) or hardware
(RTS/CTS), both modes available at all
times
Application:
Point-to-point
Typical Link Budget:
8 dB with a 50 µ cable; 12 dB with a
62.5 µ cable
Responsivity Minimum: 0.12 A/w
LED Indicators:
Diagnostics:
TD, RD, RTS, CTS, power, test
Local and remote loopback
ST or SMA
Fiber Connector:
DTE Connector:
Dimensions:
M/34 female
4.127"w x 1.52"h x 5.0"l
Wall-mount, 7.5VDC
Power Supply:
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APPENDIX C
INTERFACE PIN ASSIGNMENT
MODEL 1180/35 - FEMALE M/34 CONNECTOR (V.35)
Pin #
Signal
A
B
Frame Ground
SGND (Signal Ground)
C
D
E
RTS
CTS
DSR
F
CD
H
L
DTR
LL (Local Loop)
M
N
P
TM (Test Mode)
RL (Remote Loop)
TD
R
S
T
U
V
RD
TD/
RD/
XTC
RC
W
X
Y
XTC/
RC/
TC
AA
TC/
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Patton Electronics Company
All Rights Reserved
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