设计说明：

保护应用：

T1 / E1 / J1 lines are concentrated digital phone lines with bit rates of up to 2.0 Mbps. The data signals are low voltage but "phantom" powering schemes are often employed (as shown).

解决方案说明：

Two CO end options are shown. Each requires a ground referenced solution. The top is an unbalanced solution using 4 DO-214 devices and the bottom is a balanced one using a single 6-Pin SMT package. Regenerators are not ground referenced and use a simple metallic protection scheme as shown on the right. TeleLink保险丝为常用元件。

配套解决方案：

Other packaging solutions are offered within the Littelfuse portfolio. For instance, all four P1800SCMC's can be replaced by a single P1804UC. Thru-hole packages (TO-92's and TO-220's) also are available.

监管问题：

This solution is designed to comply with Telcordia's GR-1089 inter-building requirements.

特性：

Littelfuse is the only vendor offering the 6-Pin MS-013 surface mount package.

应用警告：

不适用。