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TCX1000-RDM20 OSC Connection Overview

 

This topic provides an overview of the OSC kit and how you connect the OSC. To use OSC forwarding for management communications, you must install the TCX1000-RDM20 OSC optics.

What is the OSC Used For?

Both the TCX1000-RDM20 and TCX1000-ILA support an OSC, which is used for several purposes:

  • To remotely manage TCX1000-RDM20 and TCX1000-ILA devices at sites with limited access to your DCN.

  • Enables zero-channel turn-up by providing an optical link between the two managed devices allowing proNX Optical Director to measure span loss between the two managed devices without having any channels turned up.

  • Assists with the optical safety for the system. If both the OSC Ethernet link state is down and the preamplifier is in active loss of signal (LOS) alarm, the booster is automatically disabled. Recovery is automatic when the fault is repaired.

Note

On the TCX1000-ILA, the OSC is passed along with the OMS line signal to the next TCX1000 device. The OSC optics on the TCX1000-ILA are internal to the device. You simply connect the Line ports to the device.

TCX1000-RDM20 OSC Kit

The TCX1000-RDM20 comes with an OSC kit that includes a 1511 nm SFP transceiver to provide the OSC channel.

On the TCX1000-RDM20, the 1511 nm OSC is multiplexed, along with the C-band DWDM channels present on the universal ports, and the composite signal is sent out the Line Out port to the fiber system. At the receiving TCX1000-RDM20, the composite line signal is received on the Line In port. The C-band channels are routed to the appropriate universal ports and the OSC is routed to the OSC 0 port. The OSC 0 port is connected to the OSC SFP transceiver which is connected to the internal CPU via an internal Ethernet Layer 2 switch.

Note

Although the TCX1000-RDM20 can support either a 1511 nm OSC on the OSC 0 port or a 1611 nm OSC on OSC 1 port we support only the use of the provided 1511 nm OSC. As a result, the OSC 1 port is not used and you can use this port, to connect an instrumentation grade optical time-domain reflectometer (OTDR) at 1611 nm for optical fiber characterization.

Connecting the OSC

There are three ports associated with the OSC on the front panel of TCX1000-RDM20:

  • OSC — Accepts an SFP optical transceiver that provides the transmit and receive functions of the OSC wavelength

  • OSC 0 — Optical port that multiplexes and demultiplexes the 1511 nm OSC signal on the Line port

  • OSC 1 — Optical port that multiplexes and demultiplexes the 1611 nm OSC signal on the Line port

These ports are used in the following manner:

  • The OSC 1 port is not used in this release. As a result, you can use the OSC 1 port, to connect an instrumentation grade optical time-domain reflectometer (OTDR) at 1611 nm for optical fiber characterization.

  • The OSC 0 port is used for Line port management communications. You connect OSC 0 port to the SFP in the OSC port with a patch cord provided in the OSC kit. It transmits and receives the 1511 nm channel from the SFP optical transceiver supplied in the OSC kit.

  • The OSC port is an SFP cage that accepts an SFP optical transceiver for the OSC function. In this release, we provide an OSC kit with each TCX1000-RDM20 that includes a 1511 nm, 100 Mbps SFP optical transceiver that provides the OSC signal. You insert the transceiver into the OSC port and then use the provided patch cord to connect the 1511 nm channel to the OSC 0 port.

These connections are illustrated in Figure 1.

Figure 1: TCX1000-RDM20 OSC Connections
TCX1000-RDM20 OSC Connections

Because the OSC signal is coupled to the WDM signal after the integrated VOA, it does not receive any additional attenuation over the loss of the system fiber. As a result, when operating the TCX1000-RDM20 on short spans, additional external loss must be added. If the OSC power at the receive side of the SFP port is measured to be above -7 dBm, then you should install the fixed loss attenuators supplied in the OSC kit.