1. vSTP ADAX Card Installation Guide
  2. vSTP TDM Support Feature Overview
  3. Feature Description

Feature Description

The vSTP TDM support feature comprises of the following protocol layers:

MTP2 Adapter Layer (NIF) – Ingress & Egress

The MTP2 Adapter Layer runs as an independent thread. It acts as a mediation layer between the M3RL Layer running on vSTP application and the MTP2 layer running on TDM PCIe Card.

The MTP2 Adapter layer has following functions:
  1. Sending MTP3 data & indications from M3RL Layer to MTP2 layer on TDM PCIe Card.
  2. Reading MTP3 data from MTP2 layer on TDM PCIe Card & sending to M3RL layer.
  3. Polling the MTP2 Layer on TDM PCIe Card for Link Status update indications & passing on these indications to the M3RL layer.
  4. Fetching the FSN and BSN numbers from TDM PCIe Card during Link changeover.
  5. Performing buffer retrieval from MTP2 link buffer on TDM PCIe Card & sending the retrieved buffers to M3RL layer.
  6. Buffering any unsent messages to MTP2 Layer.

M3RL Layer

The M3RL Layer performs the functionality specified in ITU-Q.703 and ITU-Q.704. For the Linksets with MTP2 Adapter type, the M3RL layer sends link indications and SS7 traffic to the MTP2 Adapter Layer. It processes the Link Status indications received from the MTP2 Adapter layer. Upon change of link availability status, the M3RL layer performs the following tasks:
  1. Changeover or Changeback procedures.
  2. Traffic buffering while the Linkset is On-Hold.
  3. Traffic rerouting upon completion of change back or changeover procedure.
  4. Congestion management for the links.

TDM Interface Mapping

TDM interface is a logical name given to a specific timeslot within a trunk on a TDM PCIe card. The VSTP MP Host Name, Port and timeslot uniquely identifies a TDM Interface. The TDM Link Type (E1/T1) and Speed is specified for each TDM link interface.

The following table displays the supported TDM configuration combinations:

Mode Type Timeslot Speed Encoding Framing CRC4 Timing
E1 LSL 1 to 31 64 or 56 Kbps Hdb3 N/A On, Off Acs, Mcs, Ics
E1 HSL N/A 2.048 Mbps Hdb3 N/A On, Off Acs, Mcs, Ics
T1 LSL 1 to 24 64 or 56 Kbps B8zs, Ami Sf, Esf N/A Acs, Mcs, Ics
T1 HSL N/A 1.536 Mbps B8zs, Ami SF, Esf N/A Acs, Mcs, Ics

Note:

Encoding, Framing, CRC and Timing parameters are configured through the Adax QCX utility. For more information, see Adax HDC3 Configuration using QCX.