Application Design Center - RT/ONU T1 Card

Protection of T1 / E1 / J1 Ports

Solutions

Design Notes:

Protection Application:

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).

Solution Description:

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. The TeleLink fuse is always used.

Companion Solutions:

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.

Regulatory Issues:

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

Unique Features:

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

Application Warnings:

Does not apply.