ADTRAN ISU 512 - Manual (Page 21)

Chapter 1: Understanding ISDN and the ISU 512
61202.086L1-1 ISU 512 User Manual 5
RECOMMENDED OPERATING PROTOCOLS
The ISU 512 supports BONDING Mode 1. For applications such as videocon-
ferencing, in which the unit needs to interoperate with two SW56 lines or one
dual-port ISDN device, the 2 x clear channel protocol (dual-port mode) is used.
The ISU 512 automatically uses the 2 x clear channel protocol whenever it does
not find a BONDING partner. The first call (incoming or outgoing) connects
to the V.35 port in 2 x clear channel protocol. The second call (incoming or out-
going) connects to the RS-530 port. An RS-530 to V.35 cable (part number
1200072L1) may be required in some applications. Table 1-A lists the synchro-
nous rates supported by the ISU 512, and the number of interfaces required
from the telephone company to accomplish the rate.
Table 1-A
ISU 512 Synchronous Rates
Rates
( S y n c h r o n o u s )
Rate Adaption Method
IFCs
R e q u i r e d
1 x 5 6 K BONDING/Clear Channel 1
1 x 6 4 K BONDING/Clear Channel 1
2 x 5 6 K BONDING/2 x Clear Channel Protocol 1
2 x 6 4 K BONDING/2 x Clear Channel Protocol 1
3 x 5 6 K BONDING 2
3 x 6 4 K BONDING 2
4 x 5 6 K BONDING 2
4 x 6 4 K BONDING 2
5 x 5 6 K BONDING 3
5 x 6 4 K BONDING 3
6 x 5 6 K BONDING 3
6 x 6 4 K BONDING 3
7 x 5 6 K BONDING 4
7 x 6 4 K BONDING 4
8 x 5 6 K BONDING 4
8 x 6 4 K BONDING 4