Patent ID: 12241805

DETAILED DESCRIPTION

The methods, systems, devices, circuitry and equipment of the present disclosure provide numerous advantages, novel features and/or improvements in providing various communication services for communication networks, including but not limited to providing the functionality of service monitoring via fiber cables. Discussed below and shown in the drawings are some of these advantages, novel features and/or improvements. Additional advantages, novel features and/or improvements will become apparent to those skilled in the art upon examination of the disclosure herein and the accompanying drawings, or may be learned by production or operation of the examples.

FIG.3illustrates an embodiment of the communications system and equipment of the present disclosure. The Remote Optical Communications Device10of the present disclosure is operatively connected between a first network20and a second network30, thereby allowing communication service to be transported between first and second networks over a first single fiber cable, and to be monitored and/or injected over a second single fiber cable. The device10may be implemented in a mechanical form factor, for example, a network demarcation device, as shown in and described with respect toFIG.6. It should be understood however that the presently disclosed circuitry could be implemented into other communications equipment, such as test and measurement equipment, surveillance equipment, active optical splitters, central office equipment and OSP type access panels and racks.

The first network includes service provider equipment22having a multi-wave fiber optic LC port24. The first network also includes test monitor equipment26having a multi-wave fiber optic LC port28. The second network includes customer premises equipment32having an LC fiber optic port34and two additional ports36,38. The device10includes multiple ports as illustrated, including two multi-wave fiber optic LC ports12,14, and a LC fiber optic port16. The device10also has circuitry18which defines the signal paths between the ports of the device. The circuitry18is comprised of input and output differential amplifiers connected to multiplexer switches, as discussed in more detail below with respect toFIG.5.

A first single fiber cable (Fiber1) is used to interface the communication services between the first and second network through the device10, specifically connecting the multi-wave fiber optic LC port24of the service provider equipment22of the first network20to the SFP port12of device10. The device10in turn connects to the customer equipment32of the second network30between SFP port16of the device10and LC fiber optic port34of the customer equipment32via a two fiber cables (Fiber3). A second single fiber cable (Fiber2) is used to monitor and/or test the communication services, specifically connecting the multi-wave fiber optic LC port28of the test monitor equipment26of the first network20to the SFP port14of device10. The communications device10thereby interfaces to the first network20via the Fiber1cable, and monitors signal from the first network20and/or injects a test signal to the first network20via the Fiber2cable. A multi-wave SFP device (illustrated inFIG.4) is plugged into each multi-wave LC port12,14,24and28, to interface the Fiber1cable and the Fiber2cable between the respective multi-wave LC ports as illustrated inFIG.5. Similarly, SFP modules are inserted in the LC ports16and34.

FIG.6illustrates one embodiment of the present disclosure in the form of a remote optical communication monitor and test device and system, which may be used in “dark fiber” applications. A dark fiber or unlit fiber is an unused optical fiber, available for use in fiber-optic communication. Dark fiber may be leased from a network service provider.

With respect to monitoring, the methods, circuitry and equipment of the present disclosure provide the ability and functionality of injecting and cut-thru using dark fiber. The user has the flexibility to provide injecting and cut-thru in the SFP port 1, SFP port 4, or both ports. InFIG.6, the SFP port 3 monitors, injects, or cut-thru signals via the single Fiber2cable through the SFP port 1 by means of one single fiber cable, Fiber1to the Service Providers Equipment, as schematically illustrated inFIG.6.

As illustrated inFIG.6, Primary UpLink corresponds to the connection with the First Network service provider equipment, Primary DownLink corresponds to the connection with the Second Network customer equipment, Primary UpLink Monitor/Inject corresponds to the connection with the First Network Monitor/Inject or Test Monitor equipment, and Primary DownLink Monitor/Inject (FIG.7) corresponds to the connection with a Second Network Monitor/Inject or Test Monitor equipment (not shown).

This system permits the transport of signals from a first network, and the monitor of a signal from said first network. The system also permits the transport of signals from a first network, the monitor of a signal from said first network, and the injection of a signal to the first network. The system further permits the transport of signals from a first network, the monitor of a signal from said first network, and the injection of a signal to the first network at the demarcation.

The following paragraphs disclose the use of new SFP variants, SFP+, SFP28, SFP56, and SFP112 devices and port connectors on the embodiment10illustrated inFIGS.3,5, and6. These SFP variants are referred as 1 channel or lane.

The SFP devices in embodiment10as illustrated inFIGS.3,5and6can be alternatively replaced by SFP variant devices defined as SFP, SFP+, SFP28, SFP56, and SFP112. These SFP variant devices are configured as a single channel or lane operation for each direction. The SFP ports in embodiment10are comprised of cage and connectors appropriate for the SFP device rated operation. The Table ofFIG.13illustrates SFP ports recommended backward compatibility with SFP devices operating at rated or maximum speed. A SFP28 port can accommodate a SFP28, SFP+ and SFP devices. A SFP28 port may accommodate a SFP56 or SFP112 devices operating at the 25 Gb/s or 10 Gb/s, but the SFP28 port will not support the SFP56 and SFP112 devices operating at 50 Gb/s and 100 Gb/s, respectively. The SFP28 port was not designed to operate at higher speeds whose signal spectral density is higher than the SFP28 port's ability. The SFP28 port will introduce signal impairments to the communication signal when SFP56 and SFP112 devices are operating at their maximum or nominal rate. As disclosed herein, SFP56, SFP112, and other newer variants may interoperate with lower rated SFP ports using higher signal modulations such as PAM8 and PAM16 and SFP devices with lower power dissipation. The higher signal modulation allows the signal spectral density content to be lower than a non-return to zero (NRZ) signal modulation at the same bit rate. In other words SFP56 devices with PAM4 modulation will have the ability to operate in a SFP28 port. SFP Devices in this embodiment can provide different media interfaces such as RJ45, Coax, SC, LC, Duplex LC, MPO-12, SN-Dual, MDC-Dual, and PCB traces. The multi-wave fiber optic and fiber X ports in this embodiment are defined as having an SC, LC, Duplex LC, MPO-12, SN-Dual, or MDC-Dual connector.

Referring toFIG.7, schematic diagram illustrating one embodiment of the circuitry of the present disclosure, representing for example a communication device with a plurality of port connectors, which are each connected to an input and output differential amplifier, wherein the differential amplifier connects to a multiplexer switch. The communication device first port connector Port 1 interface signals from a first network. The communication device second port connector Port 2 is configured to monitor a signal from the first network. The second port connector port 2 is also configured to monitor a signal from the first network and inject a signal to the first network. The communication device third port connector Port 3 is configured to interface signals from a second network. The communication device fourth port connector Port 4 is configured to monitor a signal from a second network. The fourth port connector Port 4 is also configured to monitor a signal from a second network and inject a signal to the second network. Further, a SFP module is inserted in all ports. These SFP modules connect to one or more fiber cables.

More specifically,FIG.7illustrates a block diagram of circuitry of the present disclosure involving four ports; Port 1, Port 2, Port 3, and Port 4 and eight differential signal paths. Port 1 has two differential signal paths, P1 and P2. Port 2 has two differential signal paths P3 and P4. Port 3 has two differential signal paths P5 and P6. Port 4 has two differential signal paths P7 and P8.

There are four input broadband differential amplifiers A0, A1, A2, and A3. The broadband differential amplifiers provide amplification and conditioning of the input signal. There are four multiplexer switches M0, M1, M2, and M3. The multiplexer switches functions as a crosspoint switch, demultiplexer, or multiplexer for routing the signals. There are four high speed output differential amplifiers Y0, Y1, Y2, and Y3. The high speed output differential amplifiers provide fixed or variable output voltages with and without pre-emphasis. The high speed output differential amplifiers Y0, Y1, Y2, and Y3 each include a retimer.

Port 1 comprises a Path P1 representing an input differential signal and a Path P2 representing an output differential signal. Port 2 comprises a Path P3 representing an input differential signal and a Path P4 representing an output differential signal. Port 3 comprises a Path P6 representing an input differential signal and a Path P5 representing an output differential signal. Port 4 comprises a Path P8 representing an input differential signal and a Path P7 representing an output differential signal.

Path P1 input differential signals connect to the input differential amplifier A1. The output signal from differential amplifier A1 can be a differential or common-mode signal. This output signal from differential amplifier A1 connects to the input of Multiplexer Switch M1 and M0.

Path P2 output differential signals connect to the output differential amplifier Y3. The input signal to differential amplifier Y3 can be a differential or common-mode signal. This input signal to differential amplifier Y3 connects to the output of Multiplexer Switch M3.

Path P3 input differential signals connect to the input differential amplifier A0. The output signal from differential amplifier A0 can be a differential or common-mode signal. This output signal from differential amplifier A0 connects to the input of Multiplexer Switch M0 and M1.

Path P4 output differential signals connect to the output differential amplifier Y2. The input signal to differential amplifier Y2 can be a differential or common-mode signal. This input signal to differential amplifier Y2 connects to the output of Multiplexer Switch M2.

Path P5 output differential signals connect to the output differential amplifier Y0. The input signal to differential amplifier Y0 connects to the output of Multiplexer Switch M0.

Path P6 input differential signals connect to the input differential amplifier A2. The output signal from differential amplifier A2 can be a differential or common-mode signal. This output signal from differential amplifier A2 connects to the input of Multiplexer Switch M2 and M3.

Path P7 output differential signals connect to the output differential amplifier Y1. The input signal to differential amplifier Y1 connects to the output of Multiplexer Switch M1.

Path P8 input differential signals connect to the input differential amplifier A3. The output signal from differential amplifier A3 can be a differential or common-mode signal. This output signal from differential amplifier A3 connects to the input of Multiplexer Switch M3 and M2.

FIG.8illustrates a front perspective view of an embodiment of an exemplary communication equipment of the present disclosure. As illustrated, on a front plate, four SFP ports are aligned or positioned in a two by two, front to front orientation. Also on the front plate, an RJ45 jack provides an RS232 craft interface for communication equipment and service status, and equipment provisioning. As illustrated, a top cover is used to protect the electronic circuit assembly. The top cover provides LED indicators for equipment and service status when the communication equipment is horizontally installed on a wall.

FIGS.9,10,11,12and13disclose another embodiment40and associated circuitry18brelating to the use of SFP-DD (double density) and SFP-DD112 devices. Circuitry18bcomprises double the circuitry18. Also disclosed is a passive optical network (PON) application for embodiments10and40.

SFP-DD devices double the number of connections of SFP, SFP+, SFP28, and SFP56 devices. SFP-DD devices are referred as 2 channel or lane devices. SFP is a single channel or 1 lane device. SFP-DD is a dual channel or 2 lane device. QSFP is a four channel or 4 lane device. QSFP-DD is an eight channel or 8 lane device. OSFP is an eight channel or 8 lane device.

Due to its small and portable physical size. SFP Devices have expanded in specifications to address other applications. SIP Devices are represented as SFP, SFP+, SFP28, SFP56, SFP112, SFP-DD, SFP-DD112, QSFP, QSFP+, QSPF28, QSFP56, QSFP-DD, QSFP-DD, QSFP-DD800, OSFP, OSFP800, and all other current and future SFF, MSA, SFP-DD, QSFP-DD, and OSFP technologies. The SFP-DD Devices in embodiment40discussed below can be alternatively replaced by various other SFP Devices which support multiple lanes and channel. These SFP Devices with multiple lanes and channels are defined QSFP, QSFP+, QSPF28, QSFP-DD, QSFP-DD112, OSPF, OSFP800, and future SFP Devices with multiple channels or lanes.

The SFP-DD devices in embodiment40inFIGS.9,10, and11are defined as SFP-DD, SFP-DD112, and future SFP-DD variants. SFP-DD devices can be alternatively replaced by SFP variant devices defined as SFP, SFP+, SFP28, SFP56, SFP112, SFP-DD, and SFP-DD112 in SFP-DD ports. SFP-DD devices doubles the number of high-speed electrical interfaces or lanes supported. These SFP-DD variant devices are configured as a dual channels or lanes for each direction. SFP-DD supports up to 100 Gb/s in aggregate over a 2×50 Gb/s electrical interface. SFP112 supports 100 Gb/s over single electrical lane, and SFP-DD112 supports up to 200 Gb/s in aggregate over a 2×100 Gb/s electrical interface. The SFP-DD ports in embodiment40are comprised of cage and connectors appropriate for the SFP-DD devices and SFP variant device. Table 1 illustrates SFP-DD and SFP-DD112 ports recommended backward compatibility with SFP variant devices, SFP, SFP+, SFP28, SFP56, SFP112, SFP-DD, and SFP-DD112. A SFP28 port may accommodate a SFP-DD or SFP-DD112 devices operating at the 25 Gbs or 10 Gb/s using a single lane, but the SFP 28 port will not support the SFP-DD and SFP-DD112 devices operating at 100 Gb/s and 200 Gb/s, respectively using 2 lanes. The SFP28 port was not designed to operate at higher speeds whose signal spectral density is higher than the SFP28 port's ability. The SFP28 port will introduce signal impairments to the communication signal when SFP56 and SFP112 devices are operating at their maximum or nominal rate. As disclosed herein, SFP56, SFP112, and other newer variants may interoperate with lower rated SFP ports using higher signal modulations such as PAM8 and PAM16 and SFP devices with lower power dissipation. The higher signal modulation allows the signal spectral density content to be lower than a non-return to zero (NRZ) signal modulation at the same bit rate. In other words, for example, SFP56 devices with PAM4 modulation will have the ability to operate from 1 Gb/s-56 Gb/s in, for example, a SFP28 port operating at 25 Gb/s, or in a SFP+(SFP10) port operating at 10 Gb/s, etc. SFP-DD devices in this embodiment can provide different media fiber optic interfaces such SC, LC, Duplex LC, MPO-12, SN-Dual, MDC-Dual, and PCB traces.

FIG.9illustrates an embodiment of the communications system and equipment of the present disclosure. The Remote Optical Communications Device40of the present disclosure is operatively connected between a first network20and a second network30, thereby allowing communication service to be transported between first and second networks over a first single fiber cable, and to be monitored and/or injected over a second single fiber cable. The device40may be implemented in a mechanical form factor, for example, a network demarcation device, as shown in and described with respect toFIG.6and a passive optical network (PON) element, as shown in and described with respect toFIG.11. It should be understood however that the presently disclosed circuitry could be implemented into other communications equipment, such as test and measurement equipment, surveillance equipment, active optical splitters, central office equipment and OSP type access panels and racks. The multi-wave fiber optic and fiber X ports are defined as having an LC, Duplex LC, MPO-12, SN-Dual, or MDC-Dual connector. SFP ports in this embodiment are SFP-DD ports, which can accept other SFP variant devices as illustrated in Table 1. The SFP-DD devices in embodiment40can be alternatively replaced by SFP variant devices defined as SFP, SFP+, SFP28, SFP56, and SFP112.

The first network includes service provider equipment22having a fiber optic port24. The first network also includes test monitor equipment26having a fiber optic port28. The second network includes customer premises equipment32having a fiber optic port34and two additional ports36,38. The device40includes multiple ports as illustrated, including three SFP-DD ports42,44, and46. The device40also has circuitry18bwhich defines the signal paths between the ports of the device. The circuitry18bis comprised of input and output differential amplifiers connected to multiplexer switches, as discussed in more detail below with respect toFIG.12.

A first single fiber cable50(Fiber1) is used to interface the communication services between the first and second network through the device40, specifically connecting the fiber optic port24of the service provider equipment22of the first network20to the SFP-DD port42of device40. The device40in turn connects to the customer equipment32of the second network30between SFP-DD port46of the device40and fiber optic port34of the customer equipment32via a fiber cable54(Fiber3). A second single fiber cable52(Fiber2) is used to monitor and/or test the communication services, specifically connecting the fiber optic port28of the test monitor equipment26of the first network20to the SFP-DD port44of device40. The communications device40thereby interfaces to the first network20via the Fiber1cable50, and monitors signal from the first network20and/or injects (transmits) or cut-thru (transmit and receive) test signal to the service provider equipment22of the first network20via the Fiber2cable52. A SFP-DD device62ais plugged into SFF-DD port42to interface cable50Fiber1. A SFP-DD device64is plugged into SFF-DD PORT44to interface cable52Fiber2as illustrated inFIG.10. Similarly, SFP-DD device66ais inserted in SFP-DD port46to interface cable54Fiber3, specifically connecting the fiber optic port34of the customer equipment32of the second network30.

FIG.11illustrates one embodiment of the present disclosure in the form of an optical line terminal (OLT) or and optical network unit (ONU) functionality with remote optical communication monitor and test capabilities for passive optical network (PON) applications. A passive optical network (PON) is a broadband point-to-multipoint architecture where a single fiber from a service provider can provide an effective method to provide high speed broadband connections to multiple end users. PON technology has evolved to XGS-PON (ITU G.9807.1) and NG-PON2 (ITU-T G.98). In a PON application, the embodiments10and40will provide optical line terminal (OLT), an optical network unit (ONU), an optical network terminal (ONT), and optical distribution network (ODN), optical wavelength coverter (OWC), an optical repeater (OR), or an optical test equipment (OTE) functionality with monitoring and test capabilities. The embodiment10can be an OLT device by inserting an OLT SFP (OLT SFP+, OLT SFP28, OLT SFP56, OLT SFP112, or OLT variant SFP) device into SFP port16, inserting a wavelength division multiplexing (WDM) SFP device into each SFP port12,14, and18, as illustrated inFIG.5. The embodiment40can be an OLT device by inserting an OLT SFP-DD (OLT SFP-DD, OLT SFP-DD112, or OLT SFP-DD variant) device66binto SFP-DD port46, inserting a dense wavelength division multiplexing (DWDM) SFP-DD device62ainto SFP DD port42, inserting a DWDM SFP-DD devices64and68into SFP-DD ports44and48, respectively as illustrated inFIG.11. The embodiment10can be an ONU device by inserting an ONU SFP (ONU SFP+, ONU SFP28, ONU SFP56, ONU SFP112, or ONU SFP variant) device into SFP port12, inserting a WDM SFP device into each SFP port14,16and18, as illustrated inFIG.5. The embodiment40can be an ONU device by inserting an ONU SFP-DD variant (ONU SFP-DD, ONU SFP-DD112) device62binto SFP-DD port42, inserting a DWDM SFP-DD device66ainto SFP DD port46, inserting a DWDM SFP-DD devices64and68into SFP-DD ports44and48, respectively as illustrated inFIG.11.

With respect to monitoring, the methods, circuitry and equipment of the present disclosure provide the additional ability and functionality of injecting and cut-thru using a single fiber cable. The user has the flexibility to provide injecting and cut-thru in the SFP-DD port44, SFP-DD port48, or both ports. InFIG.11, the SFP-DD port44monitors, injects, or cut-thru signals via the single Fiber2cable through the SFP-DD port42by means of one single fiber cable50, Fiber1to the Service Providers Equipment, as schematically illustrated inFIG.12. The SFP-DD port48monitors, injects, or cut-thru signals via the single Fiber4cable56through the SFP-DD port46by means of fiber cable54, Fiber3to the Customer Equipment, as schematically illustrated inFIG.12.

As illustrated inFIG.12, Primary UpLink corresponds to the connection with the First Network service provider equipment, Primary DownLink corresponds to the connection with the Second Network customer equipment, Primary UpLink Monitor/Inject corresponds to the connection with the First Network Monitor/inject or Test Monitor equipment, and Primary DownLink Monitor/Inject (FIG.12) corresponds to the connection with a Second Network Monitor/Inject or Test Monitor equipment (not shown).

This system permits the transport of signals from a first network, and the monitor of a signal from said first network. The system also permits the transport of signals from a first network, the monitor of a signal from said first network, and the injection of a signal to the first network. The system further permits the transport of signals from a first network, the monitor of a signal from said first network, and the injection of a signal to the first network.

Referring toFIG.12, schematic diagram illustrating one embodiment of the circuitry of the present disclosure, representing for example a communication device with a plurality of port connectors, which are each connected to an input and output differential amplifier, wherein the differential amplifier connects to a multiplexer switch. The communication device first port connector Port 1 interface signals from a first network. The communication device second port connector Port 2 is configured to monitor a signal from the first network. The second port connector port 2 is also configured to monitor a signal from the first network and inject a signal to the first network. The communication device third port connector Port 3 is configured to interface signals from a second network. The communication device fourth port connector Port 4 is configured to monitor a signal from a second network. The fourth port connector Port 4 is also configured to monitor a signal from a second network and inject a signal to the second network. Further, a SFP-DI) device is inserted in all ports. These SFP-DD device connect to one or more fiber cables.

More specifically,FIG.12illustrates a block diagram of circuitry of the present disclosure involving four ports; Port 1. Port 2, Port 3, and Port 4 and sixteen differential signal paths. Port 1 has four differential signal paths, P1, P2. P9, and P10. Port 2 has four differential signal paths P3, P4, P11, and P12. Port 3 has four differential signal paths P5, P6, P13, and P14. Port 4 has four differential signal paths P7, P8, P15, and P16.

There are eight input broadband differential amplifiers A0, A1, A2, A3, A4, A5, A6, and A7. The broadband differential amplifiers provide amplification and conditioning of the input signal. There am eight multiplexer switches M0, M1, M2, M3, M4, M5, M6, and M7. The multiplexer switches functions as a crosspoint switch, demultiplexer, multiplexer, or fanout for routing the signals. There are eight high speed output differential amplifiers Y0, Y1, Y2, Y3, Y4, Y5, Y6, and Y7. The high speed output differential amplifiers provide fixed or variable output voltages with and without pre-emphasis. The high speed output differential amplifiers Y0, Y1, Y2, Y3. Y4, Y5, Y6, and Y7 can include a retimer if the SFP device does not have an internal retimer.

Port 1 comprises a Path P1 representing an input differential signal and a Path P2 representing an output differential signal. Port 2 comprises a Path P3 representing an input differential signal and a Path P4 representing an output differential signal. Port 3 comprises a Path P6 representing an input differential signal and a Path P5 representing an output differential signal. Port 4 comprises a Path P8 representing an input differential signal and a Path P7 representing an output differential signal.

Path P1 input differential signals connect to the input differential amplifier A1. The output signal from differential amplifier A1 can be a differential or common-mode signal. This output signal from differential amplifier A1 connects to the input of Multiplexer Switch M1 and M0.

Path P2 output differential signals connect to the output differential amplifier Y3. The input signal to differential amplifier Y3 can be a differential or common-mode signal. This input signal to differential amplifier Y3 connects to the output of Multiplexer Switch M3.

Path P3 input differential signals connect to the input differential amplifier A0. The output signal from differential amplifier A0 can be a differential or common-mode signal. This output signal from differential amplifier A0 connects to the input of Multiplexer Switch M0 and M1.

Path P4 output differential signals connect to the output differential amplifier Y2. The input signal to differential amplifier Y2 can be a differential or common-mode signal. This input signal to differential amplifier Y2 connects to the output of Multiplexer Switch M2.

Path P5 output differential signals connect to the output differential amplifier Y0. The input signal to differential amplifier Y0 connects to the output of Multiplexer Switch M0.

Path P6 input differential signals connect to the input differential amplifier A2. The output signal from differential amplifier A2 can be a differential or common-mode signal. This output signal from differential amplifier A2 connects to the input of Multiplexer Switch M2 and M3.

Path P7 output differential signals connect to the output differential amplifier Y1. The input signal to differential amplifier Y1 connects to the output of Multiplexer Switch M1.

Path P8 input differential signals connect to the input differential amplifier A3. The output signal from differential amplifier A3 can be a differential or common-mode signal. This output signal from differential amplifier A3 connects to the input of Multiplexer Switch M3 and M2.

Path P9 input differential signals connect to the input differential amplifier A5. The output signal from differential amplifier A5 can be a differential or common-mode signal. This output signal from differential amplifier A5 connects to the input of Multiplexer Switch M4 and M5.

Path P10 output differential signals connect to the output differential amplifier Y7. The input signal to differential amplifier Y7 can be a differential or common-mode signal. This input signal to differential amplifier Y7 connects to the output of Multiplexer Switch M7.

Path P11 input differential signals connect to the input differential amplifier A4. The output signal from differential amplifier A4 can be a differential or common-mode signal. This output signal from differential amplifier A4 connects to the input of Multiplexer Switch M4 and M5.

Path P12 output differential signals connect to the output differential amplifier Y6. The input signal to differential amplifier Y6 can be a differential or common-mode signal. This input signal to differential amplifier Y6 connects to the output of Multiplexer Switch M6.

Path P13 output differential signals connect to the output differential amplifier Y4. The input signal to differential amplifier Y4 connects to the output of Multiplexer Switch M4.

Path P14 input differential signals connect to the input differential amplifier A6. The output signal from differential amplifier A6 can be a differential or common-mode signal. This output signal from differential amplifier A6 connects to the input of Multiplexer Switch M6 and M7.

Path P15 output differential signals connect to the output differential amplifier Y5. The input signal to differential amplifier Y5 connects to the output of Multiplexer Switch M5.

Path P16 input differential signals connect to the input differential amplifier A7. The output signal from differential amplifier A7 can be a differential or common-mode signal. This output signal from differential amplifier A7 connects to the input of Multiplexer Switch M7 and M6.

As discussed above, the present disclosure describes a method to transport signals from a first network via a first fiber cable and monitor the signal via a second fiber cable. The present disclosure also describes a method to transport signals from a first network via a first fiber cable and monitor the signal and inject a signal to first network via a second fiber cable. The present disclosure further describes a method at a network demarcation to transport signals from a first network via a first fiber cable and monitor the signal and inject a signal to the first network via a second fiber cable.

These methods comprise one or more of the following steps. A first small pluggable form factor SFP module is inserted into the device first port connector. The small pluggable form factor SFP module is an optical wave divisional multiplexer. A second small pluggable form factor SIP module is inserted into the device second port connector. The small pluggable form factor SFP module is an optical wave divisional multiplexer. A third small pluggable form factor SFP module is inserted into the device third port connector. A fourth small pluggable form factor SFP module is inserted into the device fourth port connector.

The device first port connector interfaces with the first network. The device second port connector interfaces with the first network. The device third port connector interface with the second network. The device fourth port connector interfaces with first or second network. In such a configuration, and with the above described circuitry and fiber cables, the functionality described herein is achieved.

More specifically, the circuitry, devices, systems, methods and equipment described herein will allow a Service Provider or user the ability to transport or deliver communication service and remotely monitor said communication service using a single (one) fiber cable, respectively. In other words, a single (one) fiber cable is used to transport and receive communication service and a single (one) fiber cable is used to monitor the communication service.

Further, the circuitry, devices, systems, methods and equipment described herein will allow a Service Provider or user the ability to transport or deliver communication service and remotely monitor the communication service and then inject signals using a single (one) fiber cable without disrupting the monitored communication service. A single (one) fiber cable is used to transport and receive communication service and a single (one) fiber cable is used to monitor said communication service, perform loopback testing, inject signals, and full signal cut-through.

The circuitry, devices, systems, methods and equipment described herein will help the Service Provider or user ensure quality of service for the fiber communication service by monitoring said communication service.

The circuitry, devices, systems, methods and equipment described herein will significantly decrease or eliminate the Service Provider's labor cost (i.e. truck roll) in deploying staff to troubleshoot the communication service due to the implementation of a single (one) fiber cable for transport and a single (one) fiber cable for monitoring.

The circuitry, devices, systems, methods and equipment described herein allows the Service Provider or user the ability to monitor and inject services without the need for two proprietary equipment.

The circuitry, devices, systems, methods and equipment described herein will allow a Service Provider to use any media and manufacturer type of multi-wave optical (CWDM, DWDM, PON) small form factor pluggable devices.

The circuitry, devices, systems, methods and equipment described herein provides a cost-effective solution to remotely monitor and then inject communication signals or signals through a first fiber cable and second fiber cable, respectively.

While the embodiment(s) disclosed herein are illustrative of the structure, function and operation of the exemplary method(s), circuitry, equipment and device(s), it should be understood that various modifications may be made thereto with departing from the teachings herein. Further, the components of the method(s), circuitry, equipment and device(s) disclosed herein can take any suitable form, including any suitable hardware, software, circuitry or other components capable of adequately performing their respective intended functions, as may be known in the art. It should also be understood that all commercially available parts identified herein can be interchanged with other similar commercially available parts capable of providing the same function and results.

While the foregoing discussion presents the teachings in an exemplary fashion with respect to the disclosed method(s), circuitry, equipment, and device(s) for communication services, it will be apparent to those skilled in the art that the present disclosure may apply to other method(s), system(s), device(s), equipment and circuitry for communication services.

Further, while the foregoing has described what are considered to be the best mode and/or other examples, it is understood that various modifications may be made therein and that the subject matter disclosed herein may be implemented in various forms and examples, and that the method(s), system(s), device(s), equipment and circuitry may be applied in numerous applications, only some of which have been described herein.