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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
(Synchronous)
Rate Adaption Method
IFCs
Required
1x56K BONDING/Clear Channel 1
1x64K BONDING/Clear Channel 1
2x56K BONDING/2 x Clear Channel Protocol 1
2x64K BONDING/2 x Clear Channel Protocol 1
3x56K BONDING 2
3x64K BONDING 2
4x56K BONDING 2
4x64K BONDING 2
5x56K BONDING 3
5x64K BONDING 3
6x56K BONDING 3
6x64K BONDING 3
7x56K BONDING 4
7x64K BONDING 4
8x56K BONDING 4
8x64K BONDING 4