ADTRAN ISU 2X64 user manual Channel Rate, Limited Distance Modem Applications

Chapter 6. Configuration

modem application, where two ISU 2x64 units are directly con- nected without the use of channel banks (see Figure 6-14). The far-end unit should be configured for Slave and derives its clock- ing from the ISU 2x64 configured as Master.

	64K			64K
64K	ISU 128	18 kFt		ISU 128	64K
	*	Mixed Gauge Wire		*
ISU 2x64 (U-interface)			ISU 2x64 (U-interface)
DTE	LDM 64 Master			Leased 64K	DTE
Channel Rate = 64K			Channel Rate = 64K

Figure 6-14

Limited Distance Modem Applications

If two ISU 2x64 units are connected through channel banks, both units should be configured for Slave mode (see Figure 6-15).

	64K
	64K
	*
DTE	ISU 2x64
	Channel Rate = 64K

Channel Rate

BIMUX DP

or Equivalent

XXXXX

XXXXX

XXXXXXXXX

T1

BIMUX DP

or Equivalent

64K

XXXXX	64K
XXXXX
XXXXXXXXX
*
ISU 2x64
Channel Rate = 64K	DTE

Figure 6-15

Leased Application with Channel Banks

In Leased Line operation, the channel rate for the ISU 2x64 can be configured for 64 kbps or 128 kbps. When the channel rate is set to 64 kbps, each DTE port is assigned one of the bearer channels. For example, if two ISU 2x64 units are configured for leased line service and the channel rate is set to 64 kbps in both units, then DTE#1 of the master unit and DTE#1 of the slave unit would be

48 ISU 2x64 Dual Port ISDN Service Unit User Manual 61200051L1-1D