2 - 82 Chapter 2Chapter 2 - Blade Installation and Startup2.7.7 T1/PRI (1PRIU) Interface Blade (Figure 2-40 - Figure 2-41) - P/N 0911052The T1/PRI blade provides an interface for DS1, T1 and ISDN Primary Rate Interface (PRI) applications. Thisblade has a single 24-channel 64Kb/s digital signal circuit which can be configured for either T1 trunks or PRI.Each blade connects to the network via an NTI Network Termination.If set for T1, the T1/PRI blade gives the system 24 trunks in a single universal slot. These trunks can be one ofthe following:● Loop Start● Ground Start● DID● E&M Trunks● ANI/DNIS E&M TrunksT1 gives the system the advantages of advanced digital trunking as well as conserving universal slots. Forexample, a system with 12 loop start trunks, two tie lines and six DID trunks would use up five universal slots.With T1 all these trunks would be available in a single universal slot, freeing up four additional universal slotsfor other uses.If set for PRI, each T1/PRI blade provides 24 PRI (23 B& 1 D) channels running at 1.544Mbps with 64Kb/sclear channel. The blade supports the following PRI services:● Basic PRI Call Control (BCC)● Display of incoming caller’s name and number (when allowed by the telco)● Speech and 3.1 KHz audioBy default, the system programming has an installed T1/PRI blade defined as a PRI blade in systemprogramming. System programming is also used to define whether the connection is T-Point or S-Point.When installed, the T1/PRI Interface blade uses the first block of 24 consecutive trunk ports. For example, ifyou have an COIU blade installed for trunks 1-8, the T1/PRI Interface blade will automatically use trunks 9-32.If you have COIU blades installed for trunks 1-8 and 17-24, the T1/PRI blade will use trunks 25-48. The T1/PRIInterface blade cannot use trunks 9-16 (even if available) since they are not part of a consecutive block of 24trunks. Each T1/PRI blade requires that 24 ports be available in the system, even if not all the ports will beused, otherwise the blade will not function.A maximum of 2 PRIU blades can be installed in the main chassis with the CPU. A maximum of 4 PRIU blades(for T-Point or S-Point) can be installed in a 19” chassis with a CPU. With the CygniLink feature, a maximum of8 PRIU blades can be used. The T1/PRI blade requires one universal slot and provides:● 1.5M or T1 Function
