T3 Configuration Menu

Key Sequence: Configuration

Signal Setup

T3 Signal Setup (1 of 2)

Test Mode While in DS3 test mode, select DS1 to change modes. AUTO Refer to section “AUTO Signal Setup Explanation” . DS1 Press this submenu key when connected to a 1.5 MHz T1 circuit. DS3 Press this submenu key when connected to a 45 MHz T3 circuit. Line Code: B3ZS Press this submenu key to select B3ZS line coding. AMI Press this submenu key to select Alternate Mark Inversion (AMI) line coding. Tx Clock: Internal Press this submenu key to select the internally generated Tx Clock. Recovered Press this submenu key to select a clock signal that is recovered from the receive path. Tx LBO: Low Press this submenu key to test the signal near the Base Transceiver Station (within 225 feet). DSX Press this submenu key to select a signal configuration in order to test at the cross‑connect point (more than 225 feet).

 

T3 Signal Setup (2 of 2)

Rx Input: Terminate Press this submenu key to select terminate mode. This terminates the circuit in 75 ohms. Monitor Press this submenu key to add + 20 dB gain to the receive path. Framing: M13 Press this submenu key to test the M13 framing format. C‑Bit Press this submenu key to select the C‑bit parity format, which redefines the use of the C‑bits in the M13 frame, thereby making it possible to provide in‑service, end‑to‑end path performance monitoring of the DS3 signal and in‑band data links. Unframed Press this submenu key to select testing without any framing format. The full pattern is transmitted without any formatting. No fractional T1 or subrate testing can be performed when unframed is selected.

 

Payload Setup

The Payload Setup identifies which portion of the T3 data stream is to be accessed for testing.

T3 Payload Setup (1 of 2)

Payload Type: 45Mb Press this submenu key to select full T3 data stream testing. 1.544Mb Press this submenu key to select 1 of the 28 T1 channels. Nx64kb Press this submenu key to select combinations of 64 kb channels for testing. This mode is referred to as fractional T1. 64kb Press this submenu key to select a single 64 kb channel for testing. 56kb Press this submenu key to select and test a data stream that has been reduced in size as a result of bit robbing. 16kb Press this submenu key to select 2 consecutive bits for testing within a single 64 kb channel. 8kb Press this submenu key to select a single bit for testing within a selected 64 kb channel. Payload DS1 Channel: 1.544Mb Press this submenu key to select 1 of the 28 DS1 channels. Nx64kb Press this submenu key to select combinations of 64 kb channels to be tested. 64kb Press this submenu key to select a single 64 kb channel for testing. 56kb Press this submenu key to select and test a data stream that has been reduced in size as a result of bit robbing. 16kb Press this submenu key to select 2 consecutive bits for testing within a single 64 kb channel. 8kb Press this submenu key to select a single bit for testing within a selected 64 kb channel. Payload DS0 Channel: Edit Channel Edit channel and sub‑channels when testing payloads from Nx64kb to 8kb. Payload Frame: ESF Press this submenu key to set the payload frame for ESF. SF–D4 Press this submenu key to set the payload frame for SF-D4.

 

T3 Payload Setup (2 of 2)

Other Channels: All ones, Broadcast, AIS Press these submenu keys to set the other channels (those channels that are not being tested) to All ones, to Broadcast, or to AIS.

 

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