Versitron F242x Technical Manual

Technical Manual Revision A © July 2015 VERSITRON, Inc. 83 Albe Drive / Suite C Newark, DE 19702 www.versitron.com Safeguarding Communications Since 1958

used or duplicated, for procurement or manufacturing purposes, without prior written permission by VERSITRON. VERSITRON LIFETIME WARRANTY All VERSITRON products are covered by a Lifetime Warranty against defects in materials and workmanship. This coverage is applicable to the original purchaser and is not transferable. We repair, or at our option, replace parts/products that, during normal usage and operation, are proven to be defective during the time you own the products, provided that said products and parts are still manufactured and/or available. Such repair/replacement is subsequent to receipt of your product at our facility and our diagnostic evaluation and review of the unit. Advance replacements are not provided as part of the warranty coverage. This warranty does not cover damage to products caused by misuse, mishandling, power surges, accident, improper installation, neglect, alteration, improper maintenance, or other causes which are not normal and customary applications of the products and for which they were not intended. No other warranty is expressed or implied, and VERSITRON is not liable for direct, indirect, incidental or consequential damages or losses. In the unlikely event a warranty issue should arise, simply contact us at 302-894-0699 or 1-800-537-2296 or via e-mail to [email protected] and obtain a Return Material Authorization (RMA) number. Reference this number on the outside of the shipping container and return the unit (shipping charges prepaid) to us for diagnostic review and repair/replacement as determined solely by VERSITRON. We pay the shipping charges to return the repaired unit or a replacement unit to you.

1 Description of Equipment ................................................................................................................ 4 1.1 Introduction ............................................................................................................................................................... 4 1.2 Description of Equipment .......................................................................................................................................... 5 1.2.1 Functional Characteristics ................................................................................................................................. 5 1.2.2 Physical Characteristics .................................................................................................................................... 5 1.2.3 Specifications ............................................................................................................................................................. 7 2 Installation ......................................................................................................................................... 9 2.1 General ...................................................................................................................................................................... 9 2.2 Site Selection and Mounting ...................................................................................................................................... 9 2.3 Power Requirements .................................................................................................................................................. 9 2.4 Switch Settings .......................................................................................................................................................... 9 2.5 Output Connections ................................................................................................................................................. 11 2.6 Loopback ................................................................................................................................................................. 11 2.6.1 Fiber/Copper Loopback .................................................................................................................................. 11 2.6.2 Interface Loopback ......................................................................................................................................... 12 2.7 Initial Checkout Procedure ...................................................................................................................................... 12 3 Operation ......................................................................................................................................... 13 3.1 Introduction ............................................................................................................................................................. 13 3.2 Status Indicators and Alarm Circuits ....................................................................................................................... 13 3.3 Operating Controls................................................................................................................................................... 13 4 Theory of Operation ....................................................................................................................... 14 4.1 Introduction ............................................................................................................................................................. 14 5 Maintenance and Troubleshooting ................................................................................................ 15 5.1 Introduction ............................................................................................................................................................. 15 5.2 Fault Isolation .......................................................................................................................................................... 15

1.1 Introduction This manual provides general and detailed information on the installation and operation of the Model F242x FOM II Series T1/E1 Fiber Optic Modems. Section 1 contains a general description of the equipment. Section 2 contains installation instructions. Section 3 contains operating instructions. Section 4 provides the theory of operation. Section 5 contains maintenance and troubleshooting information. Figure 1 is an overall view of the F242x. Figure 1: Overall View, F242x Fiber Optic Modem

1.2 Description of Equipment 1.2.1 Functional Characteristics Model F242x modems are designed to operate as point-to-point converters for copper-to- fiber T1/E1-standard interface extenders. F242x modems transmit over fiber optic cable up to 2km with multimode 850nm LEDs or up to 20km for single mode 1310nm LEDs. The fiber optic circuit (two F242x modems connected by fiber cable) has data rates and electrical signal characteristics that conform to ANSI T1.403, AT&T Pub. TR54016 and TR62411, and G.703/G.704 standards. Electrical signals on copper cable are converted to fiber optic signals by the F242x modem, and AMI or B8ZS/HDB3 data protocols are decoded. 1.2.2 Physical Characteristics F242x modems measure 7.0W x 0.84H x 11.6L in. (17.8 x 21. X 28.9 cm) and are designed for mounting in a variety of VERSITRON enclosures. Table 1 lists dimensions of enclosures and chassis. Standalone option is a single card enclosure (HF-1). 19” rack mount options include 2- slot chassis (HF-2SS), 20-slot chassis (HF-20A) and VERSITRON Versimux II chassis (VMX20). Each F242x modem installed in an HF-1 or HF-2SS requires a power adapter Model PSAC08 (US) or PSAC09 (European) providing 12 VDC, 1A with a one-pin connector for electrical input on the back of the card. Note: Other power adapters are available, such as UK and Australian. Model Number Description F2422 T1/E1 fiber modem, multimode, 850nm LED, LC optics, 1.544Mbps/2.048Mbps, distances to 2km. F2425 T1/E1 fiber modem, single mode, 1310nm LED, LC optics, 1.544Mbps/2.048Mbps, distances to 20km.

an LC connector for the fiber optic interface, all on the back of the card. F242x modems installed in a HF-20A or VMX20 require a Model AC300WR Power Supply / System Monitor. The F242x Modems have six LED indicators on the front panel: power on (PWR), alarm (ALM), transmit data present (TXD), receive data present (RXD), bipolar violation (BPV), and loopback mode indicator (LOOP). No audible alarm is available. Table 1: Enclosures / Chassis Model # (Part #) Dimensions Description Power Supply Required*¹ HF-1 (19052) 7.1" W x 1.3" H x 11.6" L Single Card Standalone Enclosure PSAC08 PSAC09 (LTWPD1210PLX) (LTWPD1210EPL) HF-2SS *² (19629) 19" W x 1.7" H x 13.8" L 2-Slot Rack Mount Chassis PSAC08 PSAC09 (LTWPD1210PLX) (LTWPD1210EPL) HF-20A (32406) 19" W x 7.1" H x 11.6" L 20-Slot Rack Mount Chassis AC300WR (32410) VMX20 Versimux II 7.0" H x 19.0" W x 11.6" D (17.8 x 48.0 x 29.5 cm) 20 Card Rack-Mount Chassis AC300WR (32410) *¹ Note: US Model - PSAC08; European Model – PSAC09; Other supplies are available *² Note: One Power Supply per Modem required.

Operation: Full duplex or simplex. Optical Interface: LC connectors. Digital Interface: Signal levels conform to ANSI T1.403, AT&T Pub. TR54016, TR62411, and G.703/G.704 standards. Electrical Interface: RJ48C, or BNC. Dimensions: 7.0" wide x 0.84" high x 11.6" deep (17.8 x 2.1 x 28.9 cm). Weight: 16.0 oz. (0.45 kg). Power Requirements: 120 VAC, 1.4 Watts, with optional DC wall transformer (VERSITRON Model PSAC08, providing 12 VDC, 1 A, US; VERSITRON Model PSAC09, European). Other DC wall transformers are available. Environment: 0° to +50°C (32° to +122°F) operating temperature; up to 95% relative humidity (non-condensing); up to 10,000 feet altitude; storage temperature -40° to +70° C. Table 2: Optical Performance Model F2422 F2425 Wavelength Multimode 850nm Single Mode 1310nm Link Budget 14  1 dB 19  1 dB Operating Range 2km 20km Fiber Optic Cable 50/125,62.5/125,100/140 8/125, 9/125,10/125

Format ESF (Extended Super Frame) D4 (Super Frame) AMI Yes Yes B8ZS Yes Yes

F242x modems. Section 2.2 contains general information on site selection and rack mounting. Sections 2.3 through 2.6 contain detailed instructions for connecting the modems to your system and selecting the different options. Section 2.7 contains initial checkout procedures. 2.2 Site Selection and Mounting F242x modems are designed to connect directly to the serial port (RJ48C, or BNC Connector) of line or multiplexer equipment with a cable (customer supplied). Mounting options include standalone single card (HF-1) or 2-slot (HF-2SS) or 20-slot (HF-20A) rack mount chassis. The F242x modems can also be used with the Versimux II multiplexer platform. In this case, the units are installed in the 20-slot VMX20 rack-mount chassis. 2.3 Power Requirements F242x modems operate from an AC power source or a DC power source with a DC voltage of +12 VDC, 1A. The power supplies used when installed in a HF-1, or HF-2SS are VERSITRON Model PSAC08 (US), Model PSAC09 (European), or other power supply from VERSITRON providing 12 VDC, 1A. Connect the power transformer to the F242x unit before inserting its plug into an AC power source. No special tools are required. DC power may be used instead of an AC transformer, if available. This requires a 2.5 mm socket with positive on the center and common on the concentric, and providing +12 VDC at 1A When installed in a HF-20A or VMX20, the AC300WR Power Supply / System Monitor is used to supply power for all FOM II series circuit cards installed into the chassis. The AC300WR is a redundant power supply. 2.4 Switch Settings F242x modems have one 8-position switch and two double throw switches onboard the circuit card. These switches are shown in Figure 3. The 8-position switch is labeled "S1" on the circuit card, and is positioned such that the "ON" setting of each of the 8 switch positions is towards the fiber optic connection. The settings of the 8 switch positions are as specified in Table 4 and Table 5. Position 1 on the switch is used to set the line type T1 or E1. Position 2 is used to set the termination impedance for the T1/E1 interface, as shown in Table 4. Position 3 is used to power down the receiver. Position 4 is used to set the protocol for the data transmitted

length for short haul or long haul operation. These switches must be set properly prior to operation. Three loopback settings may be changed using switch positions 6 and 7, as shown in Table 5. The fiber loopback is controlled from the front panel of the F242x while in operation. The other two switches S3 and S4 are used to enable the BNC connections. In the “ON” position the BNC connectors J6 and J7 are enabled. Note the switches are mounted so the slide is moved in the direction of the BNC to enable. Figure 3: F242x Switch and Connector Locations

SWITCH 1 NAME “ON” “OFF” POSITION 1 T1_E1 E1 T1 POSITION 2 Termination 120 Ohm(E1 Mode) 110 Ohm(T1 Mode) for Japanese terminations 75 Ohm (E1 Mode) 100 Ohm (T1 Mode) POSITION 3 Receive Power Down Receiver Powered Down Normal Operation POSITION 4 Encoding AMI(T1 Mode) HDB3(E1 Mode) B8ZS(T1 Mode) POSITION 5 Copper Cable Length Long Haul Long Cable Lengths >255ft Short Haul Short Cable Lengths < 255ft POSITION 6 Loop1 See Table 5. POSITION 7 Loop2 POSITION 8 Do Not Use Factory Setting “OFF” Factory Setting “OFF” Switch 3 Input BNC (J7) enabled RJ48C pins 1 and 2 enabled Switch 4 Output BNC (J6) enabled RJ48C pins 4 and 5 enabled Important: Set all switches prior to operation of the unit. Table 5: Switch Settings for Loop Modes POSITION 6 POSITION 7 APPLICATION OFF OFF No Loop ON OFF Analog Loop OFF ON Digital Loop ON ON Remote Loop 2.5 Output Connections F242x modems use a standard RJ48C, or two BNC (for 75 Ohm E1) connectors for the electrical signal interface. Only four of the pins are used, however. Receive data is input on Pins 1 and 2 and transmit data is output on Pins 4 and 5. 2.6 Loopback F242x modems have two loopback features. The first Loopback feature allows the user to test the fiber optic circuitry of the local unit, and the copper circuitry of the local unit. The second loopback feature loops the interface circuitry back to the remote F242x (analog and digital loop), and back to the local network (T1/E1) equipment (remote loop). 2.6.1 Fiber/Copper Loopback

When the front panel loopback switch (LB) is switched ON, the multiplexer control bit is set high and fiber optic input data is looped to the output and back to the source. The copper signals entering through the interface circuitry are encoded and decoded by the multiplexer and likewise looped back to their source. If both the fiber and copper input and output signals match, then the optical and interface circuitry of both units is operating properly. 2.6.2 Interface Loopback As listed in Table 5, switch positions 6 and 7, are used to loop the data signals at the interface. This allows for testing within the T1/E1 interface circuitry. Analog Loop causes the interface to loop at the tip and ring back through the fiber optic interface towards the remote device. Digital Loop occurs after the decoders, but before the analog drivers, in the T1/E1 interface circuit. Remote Loop causes the T1/E1 interface to loop to the connected T1/E1 equipment. 2.7 Initial Checkout Procedure F242x modems contain no power on/off switch. Once the unit is properly installed and power is applied it is considered fully operational. The power indicator (PWR) should remain on as long as power is supplied to the unit. Upon initial power up, with no signal connections made, the PWR, alarm (ALM) and bipolar violation (BPV) LED indicators should be on. When signal connections are properly made, the transmit data (TXD) and receive data (RXD) LED indicators should be on and the ALM LED should go off. The BPV LED can be cleared by pressing the RST button. Before beginning system operation the following items should be checked to verify proper installation: 1. Verify that the power plug is seated fully into the F242x or seated firmly in the rack mount enclosure. 2. Verify that the fiber optic cable is firmly seated in the LC connector. 3. Verify that the ALM LED goes out when the signals are applied to the F242x. 4. Verify that the LOOP LED comes on and goes out with the LB switch on the front panel. 5. Verify the switch settings are correct for the circuit configuration. If a malfunction is detected during the initial checkout procedure, refer to section 5 for information on isolating the malfunction in the unit.

with the F242x modems. Since the modem is designed for continuous and uninterrupted operation, there are no operating requirements. Once powered up, it should remain in service as long as required. 3.2 Status Indicators and Alarm Circuits There are six LED indicators on the F242x: power (PWR), alarm (ALM), transmit data (TXD), receive data (RXD), bipolar violation (BPV), and loopback (LOOP). No audible alarm is available. The ALM LED is activated when no signal is present at the fiber optic interface. When AMI signals are decoded, bipolar violation circuitry checks the signal. The BPV LED is activated when a violation is detected and remains on until turned off by the RESET switch on the front panel. 3.3 Operating Controls The only operating controls associated with the F242x modems are two front panel switches. The LB switch is used to enable the loopback capability of the circuit. This is described in Section 2.6 and is normally only used for diagnostic purposes when initializing or reconfiguring the system using the F242x. The reset push-button switch is only used if a bipolar violation occurs. The switch settings onboard the circuit card are described in Table 4 and Table 5 in Section 2.4 and are set prior to first using the modem. Further changes are not required unless the system requirements change.

4.1 Introduction F242x modems provide a transparent, synchronous path for T1-standard or E1-standard signals. By converting to fiber optic signaling, a distance of 2km for 850nm multimode LEDs or 20km for 1300nm single mode LEDs may be traversed without the need for a repeater or amplifier. In addition, the use of fiber optic cable as the transmission medium provides EMI/RFI protection and data security. In the F242x transmitter circuitry, the data is received via Pins 1 and 2 of the RJ48C connector or BNC(J7) for E1 75 Ohm. The signal is decoded for AMI or B8ZS protocol for T1, or AMI or HDB3 protocol for E1. The signal is then Manchester encoded (which embeds a clock signal) with a Field Programmable Gate Array (FPGA). Next the signal is converted into an optical signal. The optical signal transmitter then sends the signal out onto the fiber optic cable. Through the receiver circuitry of the F242x the same process occurs in reverse. First the optical signal is received and converted back to an electrical signal. The FPGA decodes the Manchester data and clock signals. The data signal is then encoded for the AMI or B8ZS/HDB3 protocol. The encoded output is sent to Pins 4 and 5 of the RJ48C or BNC(J6) for E1 75 Ohm. The transmission through the units is transparent to the end equipment.

5.1 Introduction This chapter contains general information designed to isolate a malfunction in the F242x modems to a replaceable unit. These units are not equipped with redundancy. Therefore, a failure in one of these units would interrupt service. 5.2 Fault Isolation The steps in Table 6 should be taken to check a non-operating modem. Contact VERSITRON Customer Service for additional diagnostic assistance or to arrange for repair as necessary.

STATUS INDICATOR PROBABLE CAUSE CORRECTIVE ACTION POWER (PWR) LED is off. No AC power. Check that both ends of the Transformer are connected. Tripped PTC. Unplug the device for a few minutes to allow the PTC to cool, then try again. Other power supply circuit problem. Contact VERSITRON Customer Service for assistance. ALARM (ALM) LED is on. Incorrect optical signal level received at receiver input. 1. Check that fiber optic cable is properly connected. 2. Check that the remote unit power is on and the fiber is connected. 3. Measure the optical levels on both ends (if possible) in order to check the optical link. 4. Contact VERSITRON Customer Service for assistance. DATA (TXD, RXD) LEDs are off or not responding as expected. Switches in wrong position. 1. Check that the switch is set for the correct electrical interface protocol. 2. Check that cable length switch is set for the appropriate cable length. No input on the electrical interface connector. Check that the interface connector is connected securely, and the connector selection switches are set appropriately. BPV LED continuously on. Switches in wrong position. Check that the switch is set for the correct AMI or B8ZS/HDB3 protocol. Inverted input on the electrical interface connector. Check that the interface connector is wired correctly.