Db (Default; Db, -15 Db, -22.5 Db; Clock Source; Local (Default-Provider Mode - Net to Net Technologies TIM1500 User Manual

2.2 Transmit (Tx) Buildout
Tx Buildout is the attenuation level of the T1 line. The shorter the distance between the TIM1500
and a remote T1 modem, the more line attenuation is required in order to prevent the incoming
amplitude of the T1 signal from becoming too strong for repeaters, switches and other T1
transmission equipment that may be encountered along the line. Increased line attenuation
translates to decreased Tx Buildout on the T1 line.

2.2.1 0 dB (default)

Receivers on most newer T1 transmission equipment can automatically adjust for incoming
amplitude, allowing them to run at zero attenuation regardless of distance.

2.2.2 -7.5 dB, -15 dB, -22.5 dB

Some older T1 transmission equipment cannot automatically adjust for incoming amplitude
and line attenuation must be set accordingly.

2.3 Clock Source

Clock source refers to the timing origination for T1 transmission links.

2.3.1 Local (default-provider mode)

Timing is derived from an oscillator on board the TIM1500.

2.3.2 Loop (default-subscriber mode)

Timing is derives from an intermediate device on the T1 line.
N Local timing is the default for a TIM1500 in T1 provider mode. Default for a TIM1500 in subscriber mode is Loop
OTE
and cannot be modified.
2.4 Frame Type
Frame type is the T1 data encapsulation method. A frame consists of 193 bits (8-bit samples of each
of the 24 T1 data channels plus a synchronization bit) transmitted at a rate of 8,000 frames per
second (1,536 kbps) across the T1 line.
2.4.1 Extended Super Frame (default)
Used in Wide Area Networks (WANs), Extended Super Frame (ESF) assembles data into 24-
frame transmission clusters and integrates the following:
Facilities Data Link (FDR): in-service monitoring and diagnostics
Cyclic Redundancy Check (CRC): scrutinization of data integrity and detection of
line errors
2.4.2 Super Frame
Super Frame (SF) assembles data into 12-frame transmission clusters.
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