Nortel Networks Video Gaming Accessories 553-3001-211 Manual De Usuario

 NT5D97 Dual-port DTI2/PRI2 card

Each NT5D97 DDP2 card occupies one slot on the network shelf. Each card 
supports two digital trunk circuits and two network loops. The total number 
of DDP2 cards per system is limited by the number of network loops, physical 
capacity of the shelf, number of DTI2/PRI2 interfaces allowed by the 
software and the range of DCH addresses.

The software configuration for the NTBK51AA DDCH is similar to the 
MSDL and only supports D-channel functionality.

The system has a total capacity of 16 addresses (Device Addresses or 
DNUM) that can be reserved for DCH card, MSDL card or DDCH card. One 
exception is DNUM 0 which is commonly assigned to the TTY terminal.

No two different D-Channel providers can share the same DNUM. Hence, the 
combined maximum number of DCH, MSDL and DDCH cards in the system 
is 16.

The DCH has one D-Channel unit, the DDCH has two D-Channel units, and 
the MSDL has a maximum of four units. Therefore, the total number of 
D-Channel is derived by the following formula:

Total_Num_DCH-Units = Num_DCHx1 + Num_DDCHx2 + 
Num_MSDLx4

Therefore, 

Total_Num_DCH-Units

 in any given system is between 0-63.

Using a NT5D97 DDP2 card instead of DTI2/PRI2 cards does not increase 
the load on the CPU. The DDP2 replaces an ENET card and two DTI2/PRI2 
cards. Emulating the ENET card and the overall CPU capacity is not impacted 
by using a DDP2 card instead of a DTI2/PRI2 card.