Section 150-441-124
June 12, 1997
Revision 01
Page 44
PairGain Engineering - Plant Series
HiGain HLU-D41
OCU
Office Channel Unit
POTS
Plain Old Telephone Service
PPM
Indicates the relative offset of the crystal oscillator in the HRU-512 from the HLU-
D41 crystal oscillator. Any value between -64 and +64 is adequate. Values
outside this range indicate out of tolerance components or excessive temperature
drift in critical components.
Pulse Attenuation
Indicates the attenuation of the 2B1Q pulse from the distant end. The HiGain
system operates with pulse attenuations in excess of 30 dB. This value is related to
the cable pair's 196 kHz loss. The pulse attenuation is a more direct indication of
the loop attenuation to the 2B1Q signal than the 196 kHz loss. The normal range
of pulse attenuation is from 1 to 32 dB.
RBS
Robbed Bit Signaling uses bits known as the A and B bits. These bits are sent by
each side of the T1 termination and are buried in the voice data of each voice
channel in the T1 circuit.
RMA
Return Material Authorization
SF
Super Frame
SNR
Signal-to-Noise Ratio
UAS
Unavailable Seconds
ZBTSI
Zero Byte Time Slot Interface
