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4.1. NCI and NC CODES TO IDENTIFY LINE CODE (AMI VS.

B8ZS),FRAMING, AND IMPEDANCE

Table 3, below carries select NC codes. The fourth character is not included in the chart and is represented by a

dash(-).

NOTE:

For more information see Telcordia Technologies Practice BR-795-403-100.

Table 3: Select NC Codes

HC-- AMI - SF

HCD- ANSI AMI - ESF

HCE- ANSI B8ZS - ESF

HCF- Non ANSI AMI - ESF

HCG- Non ANSI B8ZS - ESF

HCZ- B8ZS - SF

NCI codes are used to identify AMI vs. B8ZS on circuits with a serial number circuit ID.

Example NCI: 04DU9/1SN/

The NCI code is composed of 12 characters. The first 2 characters denote the number of wires. In the example above,

it is 4 wires. Character 3 and 4 is the protocol code. DU is a digital access interface.

Character 5 denotes the impedance. A 5 in this field denotes 135#, a 9 denotes 100#.

The first delimiter is a slash(/). Characters 7, 8 and 9 are the option codes which will determine AMI vs. B8ZS. Some

common option codes are listed below.

Table 4: Line Coding and Framing Utilizing NCI Codes

Option Codes Line code and framing

1S or 1SN (N denotes no line power) B8ZS - ESF

D or DN B8ZS - SF

1K or 1KN AMI - ESF

B or BN AMI - SF

AT&T Practice ATT-TP-000-000-006

Issue 1, 08/25/06

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