GEMINI EXPRESS MULTIPLEXER
User’s Guide
Document # 400-2601-01
Rev. C
October, 2002
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Active data pins
Configurable per customer requirement
12 dB (typical)
Optical Specifications
Fiber optic budget (point to
point)
Fiber optic budget (ring)
3 unit ring
4 unit ring
Peak power wavelength
Fiber optic connectors
Classification of LED Transmitter Device Important:
The optical transmitter contains an LED system and is classified “CLASS 1 LED
PRODUCT” per EN60825-1 (+A11), Safety of Laser Products. Contact NLynx
Technologies for repair if your GEMINI EXPRESS MULTIPLEXER ever
requires maintenance.
SPECIFICATIONS
Protocol
5250
1 & 2Mbps (transparent)
8
Data rate
Number of ports
Port connector types
Cable Distances
Shielded RJ45 or DB25
Cable Type
Category 3
Category 3
Category 3
Category 3
Category 3
Category 3
Category 5
Category 5
Category 5
Category 5
Category 5
Category 5
Data Rate
1X
1X
1X
2X
2X
2X
1X
1X
1X
2X
2X
2X
Location
Host to GXM
GXM to Device
GXM to GEMINI HUB up to 1000 ft
Host to GXM
GXM to Device
GXM to GEMINI HUB up to 500 ft
Host to GXM
GXM to Device
GXM to GEMINI HUB up to 1200 ft
Host to GXM
GXM to Device
GXM to GEMINI HUB up to 900 ft
Distance
up to 2000 ft
up to 1800 ft
up to 1000 ft
up to 900 ft
up to 2000 ft
up to 2200 ft
up to 1500 ft
up to 1650 ft
·
Note: Distances must be
derated as follows:
62 ft per category
interconnect for 1X.
38 ft per category
interconnect for 2X.
16 ft per category
interconnect for 1X.
11 ft per category
interconnect for 2X.
Cable distances over 1000’
·
3
3
5
5
·
·
·
·
must be derated by 25% for
ring applications.
Distance (fiber optic backbone)
62.5 micron multimode fiber
up to 2 Kilometers
Point to Point
Ring (3 Units)
up to 1.5 Kilometers between units and up
to 4.5 Kilometers overall.
up to 1 Kilometers between units and up
to 4 Kilometers overall.
Ring (4 Units)
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·
Verify that the host work station controller’s (WSC) capacity has not
been exceeded.
INTRODUCTION
This user's manual presents the GEMINI EXPRESS MULTIPLEXER for use with
the IBM 5250 protocol. The 5250 family of products consists of the IBM's
System 34, 36, 38, and the AS/400 along with many supporting devices
manufactured by IBM and other companies. The GEMINI EXPRESS
MULTIPLEXER works with all supporting devices that are designed within the
5250 specifications.
·
Verify that the device is properly terminated. A peripheral is terminated
when its twiaxial port has two 54.9 ohm resistors located between the “A”
phase pin & earth ground and the “B” phase pin & earth ground. Termination
is provided by a “Y” or “T” cable assembly or by a terminating balun (i.e.
ASFT series).
Verify that there are no polarity reversals in the cable.
Verify that the cable distance does not exceed the GEMINI EXPRESS
MULTIPLEXER specification.
·
·
GEMINI EXPRESS MULTIPLEXER
·
·
·
·
Verify that the cable is data grade.
Verify that the wiring uses natural pairs.
Decision Data’s MULTIPLEXER Gemini Eight-Port Express Fiber Optic
Multiplexer offers the unique ability to allow multiple AS/400 controller polling
groups to be transmitted over a single fiber optic pair. This feature allows all new
AS/400e controllers to provide their maximum throughput potential, in either
1Mbps Optimized or 2Mbps Express mode, by transparently multiplexing the
"split-polling" feature without requiring performance robbing PTF's. All new
IBM controllers support the "split-polling" feature as a means of achieving higher
throughput rates, even when connected to standard legacy devices. The Gemini
Express Multiplexer allows the "split-polling" feature to remain "enabled" with
performance of up to 4 times greater than standard legacy 1Mbps 5250 protocol.
The Gemini Express Multiplexer has 8 Shielded RJ45 port connections as well as
a DB25 "direct-connection" eliminating the need for the twinax "brick" and
associated twinaxial cabling. Link connectivity is via ST fiber optic multi-mode
connection with ability to operate in both point-to-point and multi-point "ring"
topologies, reducing hardware requirements by up to 50%. Other features include
Advanced Noise Filtering, LED Port Diagnostics, Configurable UTP Pin
Assignments, and a Field Replaceable wide-ranging Power Supply.
Verify that the wiring avoids sources of environmental noise.
Verify that the balun’s pinout matches the GEMINI EXPRESS
MULTIPLEXER ’s pinout.
Verify that the host side balun’s pinout/polarity match the device side balun’s
pinout/polarity.
·
Devices interfere with each other!
·
Verify that there is one host-polling group per GEMINI EXPRESS
MULTIPLEXER polling group.
Verify that devices on star segments have unique addresses.
Verify that all devices are properly terminated.
·
·
Devices cannot operate in Express mode!
·
·
·
·
·
Verify that the host and the device are capable of Express mode.
Verify that all interconnecting components support the Express mode.
Verify that all devices on the port are Express ready.
Verify that all cable distances are within the Express specification.
The controller may have down shifted to 1MBPS due to errors during
installation. The controller will retry the Express mode in approximately one
hour.
Flashing Express LEDs!
·
Determine the number of Express devices on the port. If there are less than
seven devices, the flashing Express LED is normal.
Express LED on without data activity!
·
If the host is disconnected during an express connection, the express LED
remains on.
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UNPACKING
P
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Remove the packing material and check for the items below:
If problems are encountered with the GEMINI EXPRESS MULTIPLEXER, the
following guideline is intended to provide a quick resolution.
1.) Collect all information relevant to this application.
·
·
·
·
·
·
GEMINI EXPRESS MULTIPLEXER serial numbers
Host type and operating system software level.
Quantity, and type of peripheral devices.
Interconnecting cable types and distances.
Equipment environment.
GEMINI EXPRESS MULTIPLEXER
A (100-240 VAC) input external power supply is attached on the rear panel.
Interconnection diagrams.
USER'S MANUAL
AC POWER CORD
2.) Setup the application with all Multiplexers in one room interconnected with
fiber optic jumpers. Verify the application with a host port and a terminal.
Gemini Multiplexer
Users Guide
3.) Search through the common problems and possible causes provided below.
The GEMINI EXPRESS MULTIPLEXER front panel power LED is off!
·
·
Verify that the AC & DC connections are proper.
Verify that the AC outlet is functioning correctly.
If the problem persists, observe the status of the external power supply’s LED and
contact Decision Data’s technical support.
NLynx
(North American units only)
The GEMINI EXPRESS MULTIPLEXER RX LED is off or flashing!
·
·
Verify that the fiber optic connectors are properly connected.
Verify that the fiber optic budget and distance has not been exceeded.
Visually inspect all items for damage. If any component is damaged, contact
NLynx Technologies for a replacement.
The GEMINI EXPRESS MULTIPLEXER TX LED is off!
Contact DECISION DATA technical support.
DO NOT APPLY POWER TO ANY DAMAGED COMPONENT!
·
If problems persists, Contact DECISION DATA technical support.
A device is down or unstable!
·
Verify that there is one host polling group per GEMINI EXPRESS
MULTIPLEXER polling group.
·
Verify that the host’s device type matches the device.
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1. The external power supply is mounted on the rear panel of the
GEMINI EXPRESS MULTIPLEXER. The AC power cord must be
firmly inserted into the external power supply and strained relieved.
ACTIVE PAIR SETUP
All GEMINI EXPRESS MULTIPLEXERS can be factory configured per
customer request. The factory default setting is Pins 4 & 5. Different
configurations will be indicated on the label on the bottom of the unit.
2. Insert the male end of the AC power cord into a properly wired
receptacle. All data & mode LED’s on the GEMINI EXPRESS
MULTIPLEXER will activate for two seconds and fade off. The
amber power LED on the front panel, the green power LED on the
top of the external power supply, and the “TX & RX” LEDs will
activate and remain on. If any terminals are on, the data activity
LEDs will activate. If express devices and an express host, are
attached, the port status LEDs (upper green LEDs) will activate.
Devices in a ring application will not show a sign on screen until the
ring is complete.
MODEL GXM8-45
PINS
S/N
4/5 3/6 1/2
xxxxxxxxxx
IDENTIFICATION LABEL
The active pair may be re-configured by performing the following procedure:
·
·
·
·
Disconnect all power to the unit.
Remove the two top cover screws located on the rear panel.
Gently slide the top cover back one inch.
Hold the top cover and tilt it up.
Reconfigure the jumpers located behind the RJ45 connectors as required. Settings
for polarity and active pair assignment are shown below:
ACTIVE PAIR JUMPER SETTINGS
It should be noted that connections to the DB25 and the RJ45s are mutually
exclusive. If any of the three pairs of the RJ45 are selected, the DB25 is
disconnected. If the DB25 is selected, the RJ45s are disconnected. All jumper
settings must be identical. To reinstall the top cover, tilt the top cover down, and
slide the top cover forward until it mates completely with the bottom cover.
Install the 2 top cover screws.
RJ45
RJ45
RJ45
RJ45
DB25
RJ45 (4/5) RJ45 (3/6) RJ45 (1/2)
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MULTIPLEXER will activate for two seconds and fade off. The
amber power LED on the front panel, the green power led on the top of
the external power supply, and the TX LED will activate and remain on.
At this time the data activity LEDs will flash at the host’s polling rate.
The RX LED will be off until the remote Multiplexer is installed.
DESCRIPTION
The GEMINI EXPRESS MULTIPLEXER’s indicators and connections are
described below.
Device side Multiplexer installation.
1) Set the configuration switches on the rear panel of the device side
GEMINI EXPRESS MULTIPLEXER as follows:
Polling
Group 1
Polling
Group 2
Power
LED
SWITCH 1 OFFSWITCH 2 ON for a point to point application
Fiber
Status
LEDs
or
SWITCH 1 OFFSWITCH 2 OFF for a ring application.
2) The MULTIPLEXER is designed for a 19” rack. The unit should be
properly installed using all four mounting holes. Rack hardware is not
provided. It is recommended that plastic or nylon washers be used under
mounting screws to protect the star’s finish.
Power LED Amber LED activates when the GEMINI EXPRESS
MULTIPLEXER is powered up.
TX Activity LED Green LED activates when a signal is transmitted to the fiber
optic aggregate link.
WARNING
DO NOT LOOK INTO ANY FIBER OPTIC
RX Activity LED Green LED activates when a signal is received from the fiber
optic aggregate link and the MULTIPLEXER synchronizes to it.
Polling Group Status LEDs The upper green LEDs are express mode indicators.
These LEDs activate when an express signal is detected and remain on until a
1MBPS signal is detected or a system reset occurs. The lower green LEDs are
data activity indicators. These LEDs activate when a signal is present.
Polling Group Connectors There are two polling groups. Each polling group has
been divided into two port groups. Polling group #1 consists of ports 0 - 3 (port
groups A & B) and Polling group #2 consists of ports 4 - 7 (port groups C & D).
Ports within a polling group must be connected to ports from a common
controller.
CONNECTOR OR FIBER OPTIC CABLE!
3. The GEMINI EXPRESS MULTIPLEXER has ST style fiber optic
connectors. For point to point applications, connect the multimode fiber
optic cable attached to the host side Multiplexer ’s ”TX” to the device
side multiplexer ’s ”RX” optical link connector located on the rear panel
of the GEMINI EXPRESS MULTIPLEXER , and connect the
multimode fiber optic cable attached to the host side Multiplexer ’s ”RX”
to the device side Multiplexer ’s ”TX” optical link connector located on
the rear panel of the GEMINI EXPRESS MULTIPLEXER. For ring
applications, connect the fiber optic TX of a Multiplexer to the fiber optic
RX of the next multiplexer down stream in the ring until the ring is
complete. Ensure that the cables are properly strained relieved and
labeled.
4. Connect the GEMINI EXPRESS MULTIPLEXER ports to the host ports
of the GEMINI active or passive star and follow the installation
procedure for the star.
F I B E R
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D
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I D E N T I F I C A T I O
L A B E L
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F C C L A B E L
E X T E R
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F I G U R A T I O
E S
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R E A R V I E W
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INSTALLATION
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Host side Multiplexer installation.
The configuration switch settings are shown below.
1. Set the configuration switches on the rear panel of the host side
GEMINI EXPRESS MULTIPLEXER as follows:
POINT TO POINT MODE
HOST SIDE MULTIPLEXER
ON
SWITCH 1 ON SWITCH 2 ON for a point to point application
or
SWITCH 1 ON SWITCH 2 OFF for a ring application.
1
2
LEGEND
2. The GEMINI EXPRESS MULTIPLEXER is designed for a 19”
rack. The unit should be properly installed using all four mounting
holes. Rack hardware is not provided. It is recommended that
plastic or nylon washers be used under mounting screws to protect
the chassis’s finish.
SWITCH 1: ON
SWITCH 2: ON
CONFIGURATION SWITCHES
HOST SIDE MULTIPLEXER
ON
3. A polling group is a group of ports which have one port active at a
time. The new AS/400 work station controllers (WSC) have two
polling groups. Ports 0-3 and ports 4-7 constitute the two groups.
The GEMINI EXPRESS MULTIPLEXER can accommodate two
RING MODE
1
2
LEGEND
SWITCH 1: ON
SWITCH 2: OFF
CONFIGURATION SWITCHES
polling in the same fashion.
The GEMINI EXPRESS
MULTIPLEXER polling group #1 consists of ports 0-3 and
GEMINI EXPRESS MULTIPLEXER polling group #2 consists of
ports 4-7. Do not connect more than one host polling group to a
GEMINI EXPRESS MULTIPLEXER polling group. Connect the
host ports to the GEMINI EXPRESS MULTIPLEXER ports.
POINT TO POINT MODE
ON
DEVICE SIDE
MULTIPLEXER
WARNING
DO NOT LOOK INTO ANY FIBER OPTIC
1
2
CONNECTOR OR FIBER OPTIC CABLE!
LEGEND
SWITCH 1: OFF
SWITCH 2: ON
CONFIGURATION SWITCHES
4. The GEMINI EXPRESS MULTIPLEXER has ST style fiber optic
connectors. Connect the multimode fiber optic cables to the optical
link connectors located on the rear panel of the MULTIPLEXER.
Note the fiber color or number on the “TX’ & “RX” to ensure proper
connection at the remote multiplexer location. Strain relieve and
label all cables.
ON
DEVICE SIDE
MULTIPLEXER
RING MODE
5. The external power supply is mounted on the rear panel of the
GEMINI EXPRESS MULTIPLEXER. The AC power cord must be
firmly inserted into the external power supply and strained relieved.
1
2
LEGEND
SWITCH 1: OFF
SWITCH 2: OFF
CONFIGURATION SWITCHES
6. Insert the male end of the AC power cord into a properly wired
receptacle. All data & mode LED’s on the GEMINI EXPRESS
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MODE DESCRIPTION
A “POINT TO POINT” link is comprised of two Multiplexer s connected by a
single backbone. A diagram of a “POINT TO POINT” link is provided below.
62.5 micron multimode fiber
GXM8
STAR
GXM8
SYSTEM 3X
UTP cabling
PATCH
PANEL
Mul
tiple Multiplexers which are connected in series with fiber optic transmit to fiber
optic receive constitute a “RING” topology. A diagram of a “RING”application is
provided below.
Balun & T cable
Up to 8 Twinax Ports
& ASF Baluns
WALL
PLATE
Typical System 3X Installation
HHOOSSTTPPOORRTT
CONNECTIONS
FIBER OPTIC BACKBONE
FIBER OPTIC BACKBONE
DEVICE
DEVICE
CONNECTIONS
CONNECTIONS
MULTIPLEXER
MULTIPLEXER
MULTIPLEXER
MULTIPLEXER
62.5 micron multimode fiber
COLLAPSED RINGS
The Ring mode is seldom implemented as depicted in the previous section.
Typically, fiber optic cables star out from a central location. Therefore, a ring is
created by interconnecting the fiber optic star segments at the central location.
This technique is known as a collapsed ring.
Remote
Controller
GXM8
GXM8
STARS
UTP cabling
M D F
F I B E R O P T I C
P A T C H P A N E L
PATCH
PANEL
F I B E R
O P T I C
Balun & T cable
J U M P E R S
Two 4 Port Twinax
WALL
PLATE
Bricks & ASF Baluns
H
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T X R X
Typical Remote Controller Installation
(WSC) and the older WSCs is the number of polling groups. The older WSCs had
one polling group for all eight ports. The newer WSCs have two polling groups.
Divide the TWINAX brick in two. Ports 0-3 comprise one polling group and
ports 4-7 make up the other polling group. The TWINAX Brick Detail illustrates
a proper connection.
I D F
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# 1
T X R X
I D F
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#
2
T X R X
I D F
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M
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R
#
3
T X R X
COLLAPSED RING
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CONNECTIONS
62.5 micron multimode
GXM
62.5 micron multimode
GXM
UTP cabling
STAR
GXM
GXM
STARS
PATCH
UTP cabling
PANEL
AS/400
PATCH
PANEL
Balun & T cable
AS/400
DB25 to DB25
STP CABLE
Balun & T cable
8 Port Twinax Brick
ASF Baluns. See
below for
WALL
PLATE
WALL
PLATE
Typical AS/400 Installation
TO AS/400 WSC
POLLING GROUP# 1
POLLING GROUP# 2
TO GXM
PORT# 0
TO GXM
PORT# 4
ASF BALUN
0
1
ASF BALUN
ASF BALUN
4
5
ASF BALUN
ASF BALUN
PORT# 1
PORT# 2
PORT# 3
PORT# 5
PORT# 6
PORT# 7
2
3
ASF BALUN
ASF BALUN
6
7
ASF BALUN
PORT & POLLING GROUP ASSIGNMENTS
ON THE TWINAX BRICK FOR THE NEW AS/400 WSC
WITH SPLIT POLLING FEATURE
FRONT VIEW
AS/400 TWINAX Brick Detail
A major difference between the newer AS/400 work station controllers
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