PRI
PRI is a form of ISDN that is generally carried over a T1 line and can provide transmission rates of up to 1.544Mbps. PRI is composed of 23 B channels, each providing 64Kbps for data/voice capacity, and one 64Kbps D channel, which is used for signaling. Table 1 compares BRI and PRI ISDN.
|
Characteristic |
PRI |
BRI |
|---|---|---|
|
Speed |
1.544Mbps |
128Kbps |
|
Channels |
23B+D |
2B+D |
|
Transmission carrier |
T1 |
ISDN |