T1 Asynchronous Transceiver (T1A)
- One T1 (1.544 Mbps) interface per card
- Intact T1 transport
- Customer T1 service capability
- Line-powering capability
- Front panel jack access for testing and monitoring
- Dual memory support for upgrades
The T1HD2-XCVR card transmits and receives up to 24 DS0s of voice or data over one copper wire pair. The T1HD2-XCVR does not use separate transmit and receive pairs—it uses one pair that provide bidirectional transmission. The card can function in an unframed format to allow for intact (asynchronous) T1 delivery to subscribers using the ADTRAN HDSL2 module. It can also function in a framed format to deliver groomed T1 service.
As an inter-terminal transport, the T1HD2-XCVR links two Tellabs 1000 terminals via a T1 span. The T1HD2-XCVR inter-operates with ADTRAN-compatible HDSL2 products. The T1HD2-XCVR card only supports H2TU-R and H2TU-C from ADTRAN, and is not end-to-end interoperable with PairGain/ADC equipment.
The T1HD2-XCVR card supports inter-terminal transport, intact (asynchronous) T1 service and groomed T1 service
The T1HD2-XCVR card supports extensive loopback diagnostics, including command-initiated loopbacks from the CLI when provisioned for service, inband loopbacks, Facility Data Link (FDL) loopbacks, and Loopback status of the entire HDSL2 span
The T1AX has three LED indicators on the faceplate. The green ACTV LED indicates the plug-in card is communicating with a counter part T1AX in another Tellabs 1000 terminal. The ACTV LED blinks rapidly (120 flashes per minute) during self-test and provisioning, and slowly (60 flash es per minute) during a loopback test. The red FAIL LED indicates a plug-in card failure or problem communicating with the CPU. The red FAIL LED blinks when there is illegal signaling. The red LOC LED indicates a problem receiving incoming data (LOS or high BER). The green AIS LED is reserved for future use.
The second-generation T1HD2-XCVR card versions (0120-0151, 0120-0152) have the following additional features, such as up to 23 kft repeatered T1 transmission on #24 AWG copper facilities, up to 17 kft repeatered T1 transmission on #26 AWG copper facilities, interoperable with the T1X-XCVR card when an H2TU-C or H2TU-R is used and compatible with other standards-based HDSL2 products.
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