VeEX MPA User Manual page 810

MPA_e_manual_D07-00-129P_RevA00
H
H3 byte
STM Pointer Action.
H4 byte
Position and Sequence Indicator byte. This byte provides a multiframe and sequence
indicator for virtual VC-3/4 concatenation and a generalized position indicator for
payloads. See also VC.
HDB3
High Density Bipolar 3. Bipolar coding method that does not allow more than three
zeros.
Header
Protocol control information located at the beginning of a protocol data unit (PDU).
HP (HPOH)
For SDH, refers to Higher-Order Path of Section Overhead.
HP-OK
Higher-Order Path OK (SDH only). In the Quick Status LEDs area, this is a status LED.
HP-RDI
Higher-Order Path - Remote Defect Indicator (SDH only). In the Quick Status LEDs
area, an alarm LED indicating a signal was returned to the transmitting HP Terminating
Equipment upon detecting a Loss of Signal, Loss of Frame, or AIS defect.
HP-REI
Higher-Order Path - Remote Error Indication (SDH only). In the Quick Status LEDs
area, an error LED indicating to the transmitting node that an errored block has been
detected at the HP receiving node.
HP-UNEQ
Higher-Order Path - Unequipped (SDH only). In the Quick Status LEDs area, an alarm
LED indicating an all-zeros pattern was detected in the C2 byte. This byte is received
from the HP terminating equipment.
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