
Chapter 6. Configuration
modem application, where two ISU 2x64 units are directly con- nected without the use of channel banks (see Figure
| 64K |
|
| 64K |
|
64K | ISU 128 | 18 kFt |
| ISU 128 | 64K |
| * | Mixed Gauge Wire | * |
| |
ISU 2x64 |
| ISU 2x64 | |||
DTE | LDM 64 Master |
|
| Leased 64K | DTE |
Channel Rate = 64K |
| Channel Rate = 64K |
Figure
Limited Distance Modem Applications
If two ISU 2x64 units are connected through channel banks, both units should be configured for Slave mode (see Figure
| 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
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 |