 | Article ID: 1528 |
| Q&A | |
What are the DTE Leads for the HSSI Port on the T3SU 300 and OSU 300?
Q: What are the DTE Leads for the HSSI Port on the T3SU 300 and OSU 300?
A:
| Abbreviation | Meaning | Purpose and Configuration |
| TA | Terminal Available | Asserted by the DTE to indicate readiness to transmit data. |
| CA | Communications Equipment Available | Asserted by the T3SU 300 or OSU 300 to indicate readiness to transmit data. |
| TM | Test Mode | Asserted by the T3SU 300 or OSU 300 when either the network or the port is being tested |
| LA | Loopback circuit A | The condition reflected by this lead is dependent on the LB lead. See table below. |
| LB | Loopback circuit B | The condition reflected by this lead is dependent on the LA lead. See table below. |
| LC | Loopback circuit C | Asserted by the unit to request a loopback from the DTE. |
LA and LB Leads
| LA | LB | Condition |
| Off | Off | No Test (normal) |
| On | Off | Local Line loopback |
| Off | On | Remote Line loopback |
| On | On | Local DTE loopback |
