What maintenance holes contain both end and sidewall entrances?

Maintenance holes that contain both end and sidewall entrances are designed to facilitate access and connectivity within underground facilities. The types specified, such as Type T, L, and J, are specifically configured to accommodate these entry points.

Type T maintenance holes are often used in scenarios where access from both the ends and sides is needed, which can be especially useful in complex network layouts. Type L and Type J also offer similar configurations, allowing for flexible installation and maintenance of conduits and other components within the underground system.

In contrast, the other options refer to different configurations of maintenance holes that might not include both types of entrances, focusing instead on other design elements or specific applications. Understanding the design characteristics of maintenance holes, including the types of entrances they have, is crucial for ensuring proper access during installation, maintenance, or troubleshooting of telecommunications and data networks in outside plant environments.