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Versitron F242x Technical Manual

T1/e1 fiber-optic modem
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F242x
T1/E1 Fiber-Optic Modem
Technical Manual
Revision A
© July 2015
VERSITRON, Inc.
83 Albe Drive / Suite C
Newark, DE 19702
www.versitron.com
Safeguarding Communications Since 1958

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Summary of Contents for Versitron F242x

  • Page 1 F242x T1/E1 Fiber-Optic Modem Technical Manual Revision A © July 2015 VERSITRON, Inc. 83 Albe Drive / Suite C Newark, DE 19702 www.versitron.com Safeguarding Communications Since 1958...
  • Page 2 No other warranty is expressed or implied, and VERSITRON is not liable for direct, indirect, incidental or consequential damages or losses.

  • Page 3: Table Of Contents

    Initial Checkout Procedure ............................12 Operation ............................13 Introduction ................................13 Status Indicators and Alarm Circuits ........................13 Operating Controls..............................13 Theory of Operation ........................14 Introduction ................................14 Maintenance and Troubleshooting ....................15 Introduction ................................15 Fault Isolation ................................15 www.versitron.com...

  • Page 4: Description Of Equipment

    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.

  • Page 5: Description Of Equipment

    F2425 1.544Mbps/2.048Mbps, distances to 20km. 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).
  • Page 6 There is an 8P8C modular connector (RJ48C standard), and two BNCs for the digital interface and 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...

  • Page 7: Specifications

    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);...
  • Page 8 Table 3: T1 Compatibility Format (Extended Super Frame) (Super Frame) B8ZS www.versitron.com...

  • Page 9: Installation

    (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.
  • Page 10 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”...

  • Page 11: Output Connections

    Remote Loop 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.

  • Page 12: Interface Loopback

    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.

  • Page 13: Operation

    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.

  • Page 14: Theory Of Operation

    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.

  • Page 15: Maintenance And Troubleshooting

    Maintenance and Troubleshooting 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.
  • Page 16 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 Check that fiber optic cable is at receiver input.

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