Enhanced TransMUX functionality with LNW20

Overview

The LNW20 enhances Alcatel-Lucent 1665 DMX TransMUX functionality by increasing capacity and supporting new configurations. LNW20 provides 48 ports supporting DS3, EC1, and TMUX services provisionable on a port-by-port basis. Each port can be individually provisioned EC1, ported channelized DS3, ported unchannelized DS3, or portless DS3. With the LNW20, one high-density pack can be used for all DS3, EC1, and/or TransMUX applications.

Description

The figure below shows the various capabilities of the LNW20. Notice that the brackets and text at the right of the figure differentiate between legacy features and new capabilities enabled only by the LNW20.

Figure 3-22: LNW20 capabilities

Before the LNW20 was introduced, Alcatel-Lucent 1665 DMX could support TransMUX functionality on DS3 signals using the LNW18. It could also support EC-1 signals using the LNW16/19B.

With the LNW20, Alcatel-Lucent 1665 DMX can support DS3, EC-1, and/or TransMUX using a single circuit pack. As the figure shows, it also supports the portless DS3 mode that allows TransMUX functionality without using any of the physical interfaces on the circuit pack (for ports in portless mode).

When a port is provisioned for Portless DS3 operation, a channelized DS3 signal within an STS-1 tributary from a SONET interface on a different circuit pack (OC-n or EC-1) or the same circuit pack (an EC-1 on another port) is terminated and demultiplexed into constituent DS1 signals. The DS1 signals are encapsulated into VT1.5 signals and cross-connected at the VT-level within the cross-connection fabric on the Main circuit pack to any other interface that supports DS1 signal transport, including a DS1 interface, a channelized DS3 interface, an EC-1 or OC-n interface. This requires two bidirectional backplane STS-1 signals to convert a single (bidirectional) STS-1 channel.

If the Main slots are equipped with Very Large Fabric LNW59, LNW82, or LNW504 circuit packs, portless operation is supported on all ports when the LNW20 circuit pack is installed in any Function/Growth group.

If the Main slots are equipped with large fabric (non-VLF) circuit packs, portless DS3 operation is supported on the odd ports only when the LNW20 circuit pack is installed in any Function/Growth group. The corresponding even port (odd port plus one) is unavailable.

If the Main slots are not equipped with large fabric or very large fabric OLIU circuit packs, portless DS3 operation is not supported and any attempts to provision portless DS3 operation will be denied.

Application advantage

Enhanced TransMUX functionality with the LNW20 enables Alcatel-Lucent 1665 DMX to:

• Upgrade density for TransMUX to 48 ports per pack

• Support DS3, EC-1 and TransMUX on a single pack

• Portless functionality allows Alcatel-Lucent 1665 DMX to cross-connect any channelized DS3 entering the shelf to any port that accepts VT-mapped STS-1s without using the electrical interfaces on the LNW20 itself.

• Groom DS1s for channelized DS3s

• Eliminate the need for separate M-13 MUXs at the DS1 aggregation site

• Pack DS3s with multiple DS1s to use bandwidth back to the network core most efficiently