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DS1 TRANSMISSION AND CABLING
3-9
LINE EQUALIZER AND COMPENSATION SETTINGS
The Generic 1 and Generic 2 DS1 circuit packs generate a signal that is preequalized. Preequalized
means that the bipolar signal is shaped so that when it reaches the cable end it conforms to the DSX-
1 power specification.
System 85 Traditional Modules
Traditional modules may be equipped with the ANN11_ and ANN35 circuit packs. Preequalization
is provided by properly setting the three equalizer switches, on the circuit packs. The three switches
must be set for either half or all of the distance to the far end. The correct equalizer and
compensation setting is determined based on the cable configuration. If a DS1 terminates at a NCTE
or DSX-1 cross-connect, the total distance to the NCTE or DSX-1 should be used. If a DS1
terminates on another DS1, then half the distance to the other interface should be used. This setting
is done in increments of about 133 feet [see table 3-1, System 85 Traditional Module Equalizer
Settings (Metallic Cable)
].
TABLE 3-1. System 85 Traditional Module Equalizer Settings (Metallic Cable)
Distance to Midpoint ANN11_, ANN35
or Endpoint (FT) Switch Settings
22 AWG ABAM & 24 AWG PDS 26 AWG PDS
1
2
3
0 to 133 0 to 90 ON ON OFF
133 to 266 90 to 180
ON OFF
ON
266 to 399 180 to 270
ON
OFF
OFF
399 to 532
270 to 360
OFF ON
ON
532 to 665 360 to 450
OFF ON
OFF
NOTE: The ANN11_ and ANN35 circuit packs only have three switches.
Off (1) is away from the switch number; on (0) is toward the switch number.
Generic 1 and Generic 2 Universal Modules
For TN722_ and TN767 circuit packs, preequalization is provided by properly administering the line
compensation field. Compensation adjustments are described in the appropriate Generic 1 and
Generic 2 administration manuals.
Pinouts for the cables connecting these circuit packs are given in System 85 R2V4 to DEFINITY
Communications System Generic 1.1 via ISDN PRI Access (555-037-233), DEFINITY Communications
System Generic 1.1 to 4ESS via ISDN PRI Access (555-037-234), and DEFINITY Communications
System Generic 2.1 to 4ESS via ISDN PRI Access (555-037-237).