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Features

• TDM support in a Next Generation Network
• 24 structured/unstructured T1/E1s per card
• Supports fractional nxDS0 bundles
• SAToP and CESoP packet modes
• E1 ISDN PRI support
• Multiple clock recovery mechanisms
• AIS Alarms & PWE Loopbacks

Related Products

• MALC MSAP Family

MALC T1/E1 PWE Line Card

T1/E1 Pseudo-Wire (PWE) Line Card

Overview

The MALC-PWE-T1/E1-24 line card supports Circuit Emulation Service (CES) using Pseudo-Wire Edge-To-Edge Emulation ( PWE3) as defined in RFC 3985. It allows T1/E1 (or Fractional T1/E1) circuits to be transported transparently over a Packet Switched Network (PSN).

Each line card supports up to 24 T1/E1 circuits that can be separated from other network traffic using IEEE 802.1Q VLANs. The PWE interface is designed to inter-operate with other, standards-based PWE devices, including PWE devices available from Zhone (such as Zhone's EtherXtend product family).

The PWE solution from Zhone supports both SAToP (Structure–Agnostic Time Division Multiplexing over Packet) and CESoP (Circuit Emulation Services-over-Packet) packetization methods and thereby supports both structured and unstructured T1/E1 circuits. In SAToP mode, the entire T1/E1 circuit is transparently transported, whereas in CESoP mode, you can transport structured, n x 64 kbps DS0 channels. In this way, fractional T1/E1 or individual voice channels / bundles can be transported much more efficiently over PWE by avoiding the need to transport an entire T1/E1 of bandwidth when only a few channels are required.

In addition to transporting nxDS0 channels, support for the CESoP packetization mode allows the MALC-PWE-T1/E1-24 line card to also support E1 ISDN PRI circuits. By configuring the PWE link in a CESoP - ISDN mode, the PWE line card can transparently transport time slots 1-31 of an E1 PRI line, while accessing and processing the SA-bits contained in time slot 0 of an E1 PRI.

All TDM applications require reliable timing to ensure quality transmission over distant networks. The MALC-PWE-T1/E1-24 line card offers three different timing modes for supplying timing/clocking across the pseudo-wire: Synchronous, Adaptive and Differential. These timing modes not only allow reliable transmission, but supports clock extraction that can be used to provide reliable loop timing to other TDM-based devices downstream from the PWE line card.

Finally, PWE Loopbacks and AIS Alarm generation and propagation are supported on the MALC-PWE-T1/E1-24 line card for maintenance and diagnostic purposes. Therefore, operators will not lose the ability to perform facility monitoring and troubleshooting procedures normally associated with T1/E1 facility maintenance.

Although many networks have upgraded or will upgrade to packet transport, older products still require TDM interfaces. The T1/E1 PWE line card for the MALC allows TDM-based services to be transported over the packet network. Zhone's PWE solution provides a means for alternative carriers to offer legacy, TDM-based services over a packet network, while incumbent carriers can migrate legacy service to packet switching networks to remain competitive. Using a single network infrastructure for both packet and TDM services saves both capital and operating expenses.

More Information

• Download MALC-PWE Datasheet (PDF)

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