T1
T1 signal from the AT & T Bell Laboratories (Bell Labs) as defined by them are used in the communication transmission unit, through the TDM approach can simultaneously transmit 24 Road, phone signal, each path signal of 64 Kbps, so a considerable rate at 1.544 Mbps, which is US-made specification, similar to the European specifications referred to as E1, can send 30 phone signal, the rate of 2.048 Mbps.
In the original definition of the T1 signal, using the sampling size of the octet to send each phone signal, while the 24 phone signal would require 8 × 24 = 192-bit, in the transmission process, these bits together with a synchronization bit, so the actual transmission frame size is 193 yuan. Frame transmission rate is 8 KHz (sent 8,000 times per second), so a second data transmission capacity of 193 × 8000 = 1,544,000 bytes; that is, rate of 1.544 Mbps.

T3 Carrier
Also known as DS3, a transfer rate of up to 43 MBPS, the green, from 674 64 KBPS channel (CHANNEL) formed. Related terms: T1

TA Terminal-adapter
ISDN uses a digital (DIGITAL) line connecting devices, sometimes referred to as ISDN MODEM, in fact the modem is used in the computer digital signals with the telephone analog (ANALOG) the conversion between the signals, while the TA is connected at both ends digital signal, but a similar appearance and function and MODEM.

Tag RAM Hardware
Used to mark the main memory (MEMORY) What are the regional information, L2 CACHE was keep a memory block, when the system to access the main memory before their reading TAG RAM data to determine cache whether the hit (HIT). TAG RAM cache size and the number of main memory capable of the role of a relationship, when the main memory can exceed the number of TAG RAM management capacity, caching will not exceed the management capacity produce an effect on memory, such as when a system of management of TAG RAM for only 128 MB of memory, but will add 160 MB main memory when the extra 32 MB of memory will always be cached system response to MISSING.