Calculate the Number of Cards Required

Below are examples of calculations to determine how many cards are needed. These are somewhat simplified; precise calculations require data about the specific network and the traffic running over it.

Example (without monitoring)

Assumptions:

• Mated pair of Signal Transfer Points
• Customer needs 10,000 MSU/s from Mobile Switching Center to Signal Transfer Point
• Average MSU size is 100 bytes/MSU over M3UA
• Less than 5 connections per IP E5-ENET card
• No monitoring is required

Calculation:

• During normal operation, each Signal Transfer Point should handle 5000 MSU/s.
• During failover operation, each Signal Transfer Point should handle 10,000 MSU/s.
• Each E5-ENET over M3UA with up to 4 connections and 100 byte/MSU without monitoring can support 2000 MSU/s.

So 2,000 MSU/s is 1 erlang

40% of 2,000 is 800 MSU/card

To support 5,000 MSU/sec @ 40% rate, 7 cards per Signal Transfer Point are required.

Example (with monitoring)

Assumptions:

• Mated pair of Signal Transfer Points
• Customer needs 10,000 MSU/s from Mobile Switching Center to Signal Transfer Point
• Average MSU size is 100 bytes/MSU over M3UA
• Less than 5 connections per IP E5-ENET card
• Monitoring is required

Calculation:

• During normal operation, each Signal Transfer Point should handle 5000 MSU/s
• During failover operation, each Signal Transfer Point should handle 10,000 MSU/s
• Each E5-ENET over M3UA with up to 4 connections and 100 byte/MSU with monitoring can support 1400 MSU/s

So, 1,400 MSU/s is 1 erlang

40% of 1,400= 560 MSU/card

To support 5,000 MSU/sec @ 40% rate, 9 cards per Signal Transfer Point are required.

IPLIMx linksets are permitted up to 16 links or, if one link per card, 16 cards. linksets are permitted up to 8 links; at one per card, 8 cards are allowed. An Application Server (i.e., in M3UA, a point code) is not permitted to span linkset boundaries, so the prescribed traffic rate would require a different architecture. For example, two Application Servers with different point codes could be used, one with 4 cards and one with 5 cards. A better solution, however, would be to segregate the traffic by type prior to reaching the SS7-over-IP cards, using smaller multiple servers and smaller linksets.

Guidelines for Maximum Provisionable IPSG Cards

The guidelines for maximum number of IPSG cards that can be provisioned depends on the following factors and is shown in Table 5-18.

• IPSG card hardware type (E5-ENET, E5-ENET-B or SLIC)
• System TPS capacity
• Status of the E5-ENET-B IPSG High Throughput feature

Table 5-18 Guidelines for Maximum Provisionable IPSG Cards

HIPR2 High Rate Mode Feature	E5-ENET-B IPSG High Throughput Feature	E5-ENET IPSG	E5-ENET-B IPSG	SLIC
ON	ON	150	78	75
ON	OFF	150	115	75
OFF	ON	100	52	N/A
OFF	OFF	100	76	N/A