![](/images/new-backgrounds/1299578/29957839x1.webp)
Chapter 1: Understanding ISDN and the ISU 512
ISU 512 INTEROPERABILITY
Telephone networks are evolving from analog technologies to digital technol- ogies such as ISDN. This transition is
The ISU 512 bridges this transition by supporting communications with exist- ing and future network services and equipment. The ISU 512 supports com- munications with Switched 56 (SW56) Service and Switched 56 DSUs
Figure 1-2 illustrates the ISU 512 (U interface) operation in various switched network services and customer premises products.
Videoconferencing
512kbps •Interoperates with
SW56 DSUs and dual port ISDN TAs at 112/128 kbps
Up to 4 BRI | ISU 512 | |
|
| |
| ISU 512 |
|
| * | V.35 |
Up to 4 BRI | ISU 512 |
|
| ISU 512 | 512 kbps | |
•Image transfer |
|
| * |
•Data backup | ISDN SWITCH |
| |
|
| workstation |
Up to 4 BRI | ISU 512 | |
Disaster Recovery - T1 Backup | ||
|
•TSU with Dial Backup
ISU 512
Module (DBU) | * |
•Up to 512 kbps of backup ISDN SWITCH | T1 |
bandwidth | V.35 |
Bridge/Router
ADTRAN T1 DSU/CSU,
TSU 100, OR TSU 600
Figure
ISU 512 (U interface) Applications
The ISU 512 (ST interface) will also support these configurations but will require an external NT1 for each BRI line.
4 | ISU 512 User Manual |