ADC HIGAIN HDSL2 Manual page 30

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Provisioning

SF Number

ESF-RAI to SF-RAI Overwrite (ROVR) Option. If the ESF RAI to SF RAI Overwrite (ROVR) option is

enabled, it allows a network ESF RAI or ESF RAI-CI pattern to be converted into a CPE SF RAI or SF RAI-CI

pattern, and overwrites bit 2 of every DS0 channel with a zero.

If the ROVR option is disabled, it prevents conversion of a network ESF payload with an embedded RAI pattern.

Disabling the ROVR option preserves the integrity of the CPE payload as it was originally transmitted.

Power Back Off (PBON and PBOC) Option. Power Back Of Network (PBON) and Power Back Off

Customer (PBOC) allow the HDSL circuit to support two transmit power templates: default (DEF/higher level)

and enhanced (ENH/lower level). These are defined in Section 6.1.4.2 of the ANSI T1E1.4 HDSL2 standard. Each

HDSL2 receiver detects the level it is receiving during the start-up, pre-activation sequence. It then compares this

level to the level it should be receiving according to the PBON and PBOC option settings (DEF or ENH). If the

received level is outside the template limits, the receiver sends a message to the upstream HDSL2 transmitter

requesting the proper level. These levels are adjusted only during the start-up routine or if the PBON or PBOC

option settings are changed during normal operation. Since the ENH template levels are up to 15 dBm below those

of the DEF template, the ENH setting can be used to reduce crosstalk levels into adjacent circuits. (For example,

if crosstalk noise is being induced by the H2TU-R, set the PBO C option to its lower (ENH) level setting.

Conversely, if the HDSL2 signal at the H2TU-R is being affected by crosstalk noise induced from adjacent pairs,

set the PBOC option to its higher (DEF) level setting.

Changing these Power Back Off option settings on a live circuit causes the HDSL2 loop to

momentarily drop and then reacquire synchronization. This setting can also affect the operating

margins.

AIS-CI (Alarm Indication Signal-Customer Installation). The H2TU-C-231 List 1F in conjunction with

the H2TU-R-402 List 4 supports the AIS-CI function. AIS-CI is a variant of AIS which is transmitted toward the

network when either an AIS defect or an LOS defect has been detected in the signal received from the CI at the

H2TU-R unit. AIS-CI is a regular AIS signal modulated by an AIS signature.

The AIS-CI signal is a repetitive pattern with a period of 1.26 seconds. The pattern is formed by sequentially

interleaving 1.11 seconds of an unframed all ones pattern and 0.15 seconds of all ones modified by the AIS-CI

signature. The AIS-CI signature is defined as a pattern which recurs at 386 bit intervals (two DS1 frame lengths)

in the DS1 signal and is 01111100 11111111 (right to left). This results in a repetitive pattern of 6176 bits. If the

Table 10. SuperFrame Format

Terminal Framing Bit

October 2, 2000

Frame Bits

SuperFrame Signaling Bit

152-231-116-01, Revision 01

H2TU-C-231 List 1F

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