MAX Administration Guide
5-1
5
Administering E1 and T1 Services
A T1 line supports 24 64-Kbps channels, each of which can transmit and receive data or
digitized voice. The line uses framing and signaling to achieve synchronous and reliable
transmission. The most common configurations for T1 lines are ISDN Primary Rate Interface
(T1 PRI) and unchannelized T1, including fractional T1. The MAX unit supports up to four T1
lines for up to 96 concurrent sessions.
An E1 Primary Rate Interface (E1/PRI) line consists of 32 64-Kbps channels. E1/PRI uses 30
B channels for user data, one 64-Kbps D channel for ISDN D-channel signaling, and one
framing channel. The B channels can be all switched, all nailed up, or a combination of
switched and nailed up. The E1/PRI line is a standard in Europe and Asia called CEPT G.703.
A T1 Primary Rate Interface (T1/PRI) line has a total bandwidth of 1.544 Mbps. T1/PRI uses
23 B channels for user data, and one 64-Kbps D channel for ISDN D-channel signaling. The B
channels can be all switched, all nailed up, or a combination of switched and nailed up. The
T1/PRI line is a standard in North America, Japan, and Korea. Connect this type of line to
standard voice, Switched-56, Switched-64, Switched-384, Switched-1536, and MultiRate data
services. Using a feature called PRI-to-TI conversion, the MAX can share the bandwidth of a
T1/PRI line with a PBX.
Use the MAX unit’s indicator lights to begin troubleshooting and diagnosing E1 or T1
problems. Use line diagnostics to perform tests on the unit and see the information that is
displayed in the unit’s status windows to determine whether or not E1 or T1 performance is
meeting your standards. By verifying telephone numbers and using one VT100 interface
parameter, remedy a Trunk Down state on the unit. Use the terminal-server command line
interface (CLI) to test lines, reset the unit, clear calls, and display clock source. Verify
