- SS7 Enhancements

The SS7 Raw Data to Host feature allows the customer a way of tracking all Message Signaling Units (MSUs) and Link Status Signaling Units (LSSUs) transmitted to the network and received from the network.

This feature allows the SS7 Series 3 and SS7 PQ cards to send PPL event indications containing LSSUs and MSUs (received from the network as well as sent to the network) to the host. The PPL Configure (0x00D7) message is used to enable and disable (default) the feature.

This feature is started by setting (enabling) configuration bytes 0x10 in the following PPL components:

• Enabling the PPL event indications containing the raw LSSUs for transmission/reception to and from the network is done by enabling the configuration bytes 0x10 in the MTP2 LSC and MTP2 IAC PPL components.

• Enabling the PPL event indications containing the raw MSUs for transmission/reception to and from the network is done by enabling the configuration bytes 0x10 in MTP3 HMDT and HMRT PPL components.

When the feature is enabled all the supported LSSUs and MSUs are reported to the host in the PPL event indication.

This feature provides the ISUP CPC configuration byte ANSI ISUP Segmentation 0xD4 that allows you to select the forward indicator E bit in the Initial Address Message (IAM) for ANSI segmentation or as a spare.

ANSI ISUP specification T1.113 - 1995 defines the E bit of the forward indicator in Initial Address Message (IAM) as the IAM Segmentation Indicator. If the E bit is set in the IAM, the receiving exchange will start timer T36 and wait for the Information (INF) message. During this time, the Address Complete Message (ACM) will not be sent back even when requested by the host call control.

However, the ANSI ISUP specification T1.113 - 2000 defines the E bit of the forward indicator as a spare. In this case, ISUP implementation may run into the problem when receiving an IAM with the forward indicator E bit set, and call control requests such as Connect AB, PPL Event Requests of ACM from the host call control are received before timer T36 expires. These messages will be positively acknowledged, but the ACM will not be sent to the network. Eventually, the call fails when timer T7 expires from the transmission end.

The ISUP CPC PPL Component (0x0012) provides ANSI ISUP Segmentation (0xD4) configuration byte to define whether the forward indicator E bit in the IAM should be interpreted as a segmentation indicator. When this configuration byte is set, timer T36 will be started for the INF message, and Call Control request for the ACM will not be processed if received before timer T36 expires. If this configuration byte is not set, the forward indicator E bit is considered as a spare, and the ACM can be sent out immediately, and there is no waiting period for the INF message.

This host initiated feature enables the customer to determine what CIC groups are configured in order to perform detailed queries, for each CIC group, without any prior knowledge of the existing configuration.

The feature supports the SS7 CIC Query (0x0067) message to display CIC group information. This host initiated message, with the following parameters, is used to query all of the CIC groups for a stack.

• Destination Point Code (DPC) (0xFFFFFFFF) used to query all CIC groups for the stack. The resultant CIC group information can be used to query a particular CIC group.

The AIB in the response message is used to differentiate between the following queries:

• For existing CIC group queries: to query information on a particular CIC group, use the SS7 CIC AIB (0x14).

• For CIC group queries: to query information on all of the configured CIC groups, use SS7 Stack AIB (0x08)

See Signaling System Number Seven.

A computer, attached to the Excel platform through an RS-232 or Ethernet link, from which you run the telecommunications application that controls the Excel platform.

See Programmable Protocol Language.

In PPL, a condition that, when met, drives a state machine (PPL Component) from one state to another, by invoking an associated Primitive. In PPL files, an Event is marked by an arrow and text.

Message Transfer Part level 2 - data link level

Message Transfer Part level 3 - network level

American National Standards Institute. ANSI administers and coordinates the U.S. voluntary standardization and conformity assessment system for the
telecommunications industry. More details on these standards may be
viewed at www.ansi.org.

See Integrated Services Digital Network User Part.

Digital communications link - voice, data, and video at a 1.544 Mbps rate (24 64 Kbps channels)

ISDN User Part (ISUP)

A condition that, when met, drives a state machine from one state to another. A condition that drives a Component out of its current state by invoking an associated primitive.

A programmable software component that uses PPL state machines that can be modified with the PPL Tool.

Setting up, monitoring, and tearing down calls.

See Circuit Identification Codes.

See Address Information Block.

A number that addresses a node in a SS7 network.