Understanding TCX Series Point-to-Point Topologies

 

This topic describes and illustrates the supported point-to-point network configurations.

Note

The proNX Optical Director provides complete end-to-end optical control and management for all Juniper Networks products described in the following sections.

Simple Point-to-Point Direct Connect

The simplest network configuration you can create is with just two TCX1000-RDM20 units and coherent transceivers in the router connected directly to the universal ports as illustrated in Figure 1.

Figure 1: TCX1000-RDM20 Point to Point — Direct Connect
TCX1000-RDM20 Point to Point — Direct
Connect

This scenario enables you to transport channels from a Juniper Networks router over the high speed optical network. Integrated coherent transceivers in the router are directly connected to universal ports on the TCX1000-RDM20. On the transmit side, the TCX1000-RDM20 multiplexes the channels and transmits the composite signal out the Line out port to the fiber span. On the receive side, the TCX1000-RDM20 receives the composite signal from the fiber span on the Line in port, demultiplexes the channels, and routes them to the appropriate universal ports, which are directly connected to the transceivers in the router.

You can use the following Juniper Networks products in this configuration:

  • As an amplifier solution for this configuration, you can use the TCX1000-ILA.

  • For MX Series routers, you can use the MIC3-100G-DWDM, 100-Gigabit DWDM OTN MIC.

  • For PTX Series routers, you can use the PTX-5-100G-WDM, 5-port 100-Gigabit DWDM OTN PIC.

  • For QFX Ethernet switches, you can use the QFX10K-12C-DWDM line card, which is a 6-port line card, with built-in optics that supports flexible rate modulation at 100 Gbps, 150 Gbps, and 200 Gbps speeds. Both the QFX10008 or the QFX100016 support this line card.

Short Reach Router Interfaces with Disaggregated Transceivers

In scenarios where the router interfaces are short-reach, you can construct a similar configuration using disaggregated transceivers to generate the coherent channels, as illustrated in Figure 2.

Figure 2: TCX1000-RDM20 Point to Point — Direct Connect with Disaggregated Transceivers
TCX1000-RDM20 Point to Point —
Direct Connect with Disaggregated Transceivers

In this configuration, short reach optical interfaces on the router are connected to the client ports on a disaggregated transceiver, which connects the channels directly to the universal ports on the TCX1000-RDM20. On the transmit side, the TCX1000-RDM20 multiplexes the channels present on the universal ports and transmits the composite signal out the line port to the fiber span. On the receive side, the TCX1000-RDM20 receives the composite signal on the line port, demultiplexes the channels and routes them to the appropriate universal ports, which are directly connected to the disaggregated transceivers.

You can use the following Juniper Networks products in this configuration:

  • As an amplifier solution for this configuration, you can use the TCX1000-ILA.

  • For routers, you can use either the MX Series or PTX Series routers

  • For disaggregated transceivers, you can use Juniper Networks BTI7800 with the Universal Forwarding Modules (UFM): UFM3 with coherent CFP and UFM6.

Simple High Capacity Point-to-Point Using TCX1000-RDM20 and Multiplexer/Demultiplexer

To limit the number of universal ports that you use so that you can have room for future expansion, you can connect an optical multiplexer to a universal port and connect your transceivers to the multiplexer. For this configuration, you can pair the TCX1000-RDM20 with either the TCX1000-2D8CMD or the Juniper Networks BTI7800-FMD96. The example in Figure 3 uses the BTI7800-FMD96. This configuration supports up to 96 x 200 Gbps coherent channels with 50 GHz spacing using only a single universal port on the TCX1000-RDM20. This allows full fill of the spectrum for maximum system capacity while using the minimum number of universal ports on the TCX1000-RDM20 to allow for later system expansion.

Figure 3: TCX1000-RDM20 Point-to-Point with Fixed Multiplexer/Demultiplexer
TCX1000-RDM20 Point-to-Point with
Fixed Multiplexer/Demultiplexer

On the transmit side, the coherent channels on the router interfaces connect directly to the client ports on the BTI7800-FMD96, which multiplexes the channels and sends them out the composite line port to the universal port on the TCX1000-RDM20. The TCX1000-RDM20 further multiplexes the channels and sends the composite signal out the line port of the TCX1000-RDM20 to the fiber span. At the receive side, the TCX1000-RDM20 receives the composite signal from the fiber span on the Line In port, demultiplexes the channels and routes the signal to the Line In port of the BTI7800-FMD96, which further demultiplexes the channels and routes them to the clients ports of the BTI7800-FMD96, which are directly connected to the transceivers in the router.

You can also build this configuration using coherent interfaces in the router (as shown in Figure 3) or with disaggregated coherent transceivers between the router and the multiplexer/demultiplexer.

To build this configuration using coherent interfaces in the router, you can use:

  • For MX Series routers, you can use the MIC3-100G-DWDM, 100-Gigabit DWDM OTN MIC.

  • For PTX Series routers, you can use the PTX-5-100G-WDM, 5-port 100-Gigabit DWDM OTN PIC.

  • For QFX switches, you can use the QFX10K-12C-DWDM line card, which is a 6-port line card, with built-in optics that supports flexible rate modulation at 100 Gbps, 150 Gbps, and 200 Gbps speeds. Both the QFX10008 or the QFX100016 support this line card.

  • As an amplifier solution for this configuration, you can use the TCX1000-ILA.

  • For the fixed multiplexer-demultiplexer, you can use the BTI7800-FMD96.

  • For a colorless multiplexer-demultiplexer, you can use the TCX1000-2D8CMD.

To build this configuration with disaggregated coherent transceivers between the router and the multiplexer/demultiplexer, you can use:

  • The MX Series or the PTX Series routers or the QFX10008 or the QFX100016 switch

  • As an amplifier solution for this configuration, you can use the TCX1000-ILA.

  • For the fixed optical multiplexer-demultiplexer you can use the BTI7800-FMD96.

  • For the disaggregated transceivers, you can use the BTI7800 Universal Forwarding Modules (UFM): UFM3 with coherent CFP and the UFM6.

  • For a colorless multiplexer-demultiplexer, you can use the TCX1000-2D8CMD.

TCX1000-RDM20 Direct Connect with Fixed Multiplexer/Demultiplexer Deployed Simultaneously

The multiplexer and direct connect solution can also be deployed simultaneously as shown in Figure 4.

Figure 4: Direct Connect with Fixed Multiplexer/Demultiplexer Deployed Simultaneously
 Direct Connect with Fixed Multiplexer/Demultiplexer
Deployed Simultaneously

In this topology, five channels from the disaggregated coherent transceivers, connect to the clients ports of the BTI7800-FMD96 fixed multiplexer. On the transmit side, the channels are multiplexed and sent out the composite line side of the BTI7800-FMD96, which is directly connected to a universal port on the TCX1000-RDM20. The TCX1000-RDM20 further multiplexes the channels, along with any directly connected channels, and routes the composite signal out the line port to the fiber span. At the receive side, the TCX1000-RDM20 receives the composite signal from the fiber span on the Line In port, demultiplexes the channels and routes them to the receive line side of the BTI7800-FMD96, which further demultiplexes the channels and routes them to the directly connected disaggregated transceivers.

This configuration provides a dense, low-loss solution for combining the channels, but the frequency of each channel is locked to the port of the fixed BTI7800-FMD96. The additional coherent transceiver directly connected to the TCX1000-RDM20 universal port is effectively on a colorless port and because it is tunable, you can use it as a standby channel for all the channels connected on the client ports of the BTI7800-FMD96. This configuration provides a remotely reconfigurable solution and the direct connect transceivers can be used to replace any of the channels on the BTI7800-FMD96 in the event of their failure.

You can use the following Juniper Networks products to build this configuration:

  • As an amplifier solution for this configuration, you can use the TCX1000-ILA.

  • For colorless applications, you can use the TCX1000-2D8CMD multiplexer to add/drop channels or you can connect channels directly to the TCX1000-RDM20 (as shown with the backup channel transponder).

  • For the fixed optical multiplexer you can use the BTI7800-FMD96.

  • For disaggregated transceivers, you can use Juniper Networks BTI7800 with the Universal Forwarding Modules (UFM): UFM3 with coherent CFP and the UFM6.