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Chapter 2 Introduction
Avaya M770 User’s Guide 5
DomainX Budget Calculation
The maximum number of DomainX modules you can insert in the hub is
determined by domain usage considerations, as follows (M-SPV refers to either the
M-SPV or the M-SPX in the following examples):
The Avaya M770 allows a maximum of 100 Domain Resource Units (DRUs) for
DomainXL (Left DomainX - slots 1-7) and the M-SPV, and 100 DRUs for DomainXR
(Right DomainX - slots 8-14) and the M-SPV. Each of the DomainX modules, as well
as the M-SPV module, has a DRU budget, as shown in the table below. When
planning your hub configuration, calculate whether it fits the Avaya M770 DRU
budget.
Table 2.1 DRU Budget of DomainX Modules
Budget Calculation Examples
1 If you have six M14-10F modules, an M2-1000 module and the M-SPV you get:
6*6+15+10 = 61 DRUs. Assuming that you have the same configuration on the
DomainXL and Domain XR switches you get a total of 168 Ethernet, 12 Fast
Ethernet and 4 Gigabit ports.
2 If you have five M12-100 modules and the M-SPV you get: 5*18+10 = 100 DRUs.
Assuming that there are five modules on both the DomainXL and Domain XR
switches you get a total of 120 ports.
3 If you have six M2-1000 modules and the M-SPV you get: 6*15+10=100 DRUs.
Assuming that there are six modules on both the DomainXL and Domain XR
switches you get a total of 24 Gigabit Ethernet ports and 72 Fast Ethernet ports.
4 If you have four M12-100 modules, one M2-1000 and the M-SPV/M-SPX you
get: 4*18+15+10=97 DRUs. This is less than 100 DRUs and is therefore another
possible configuration.
Module Name DRU Budget
M-SPV/M-SPX 10 DRUs
M12-100T 18 DRUs
M12-100F 18 DRUs
M2-1000 15 DRUs
M-MLS 6 DRUs
M14-10F 6 DRUs
M24-10T 9 DRUs