Chapter 1: Understanding ISDN and the ISU 512

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

Rate Adaption Method

IFCs

 

 

(Synchronous)

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

 

 

 

 

 

 

61202.086L1-1

ISU 512 User Manual

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ADTRAN user manual Recommended Operating Protocols, ISU 512 Synchronous Rates