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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 time-consuming and costly for tele-
phone companies and upgrading all locations and facilities is a lengthy
process.
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 (2-wire
and 4-wire) as well as various ISDN terminal adapters, ISDN terminal equip-
ment, and BONDING Mode 1-compatible inverse multiplexers.
Figure 1-2 illustrates the ISU 512 (U interface) operation in various switched
network services and customer premises products.
Videoconferencing
•Cost-effective video at 384 and
512 kbps
•Interoperates with
SW56 DSUs and dual port
ISDN TAs at 112/128 kbps
High-Speed File Transfers
•Image transfer
•Data backup
Disaster Recovery - T1 Backup
•TSU with Dial Backup
Module (DBU)
•Up to 512 kbps of backup
bandwidth
The ISU 512 (ST interface) will also support these configurations but will require an
external NT1 for each BRI line.
4
Up to 4 BRI U-Interfaces
ISDN SWITCH
Up to 4 BRI U-Interfaces
ISDN SWITCH
Up to 4 BRI U-Interfaces
T1
ISDN SWITCH
ADTRAN T1 DSU/CSU,
TSU 100, OR TSU 600
ISU 512 User Manual
ISU 512
RS-530/V.35
ISU 512
ENTER
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ISU 512
512 kbps
ISU 512
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High-speed
workstation
ISU 512
ISU 512
ENTER
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R S C S
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V.35
Bridge/Router
ISU 512 (U interface) Applications
Figure 1-2
61202.086L1-1
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