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Customizing DSX-1-Compatible Units
4-3
7924-A2-GB20-30
October 1997
Table 4-1. DSX-1-Compatible Units Configuration Options (1 of 2)
1) HDSL Card Type
Possible Settings: CP, CO
Default Setting: CP
Indicates the placement of the unit in the network configuration. To toggle the card type,
enter 1 at the Config prompt.
CP – Unit is on the customer premises (remote) side of the HDSL connection.
CO – Unit is on the central office (or central site) side of the HDSL connection.
2) Loops Enabled
Possible Settings: Single, Dual
Default Setting: Dual
Specifies which loops on the HDSL line are to be used in the connection. To change the
loops that are enabled, enter 2 at the Config prompt. The system then prompts you to
specify either (S)ingle or (D)ual Loops.
Dual – Loops A and B are enabled.
Single – Only Loop A is enabled.
3) T1 Line Encode
Possible Settings: B8ZS, AMI
Default Setting: B8ZS
Specifies the type of line encoding used to ensure ones density in the transmission
signal. To toggle the encoding method, enter 3 at the Config prompt.
B8ZS – Binary 8 Zero Substitution.
AMI – Alternate Mark Inversion.
4) Framing
Possible Settings: D4, Extended Superframe, Unframed
Default Setting: D4
Specifies the type of framing to be used. To toggle the framing method, enter 4 at the
Config prompt.
D4 – Commonly used framing method on T1 circuits, consisting of 12 frames of 192 bits
with the 193rd bit used for error checking and other functions. Also called Super
Framing.
Extended Superframe – Framing method consisting of 24 frames of 192 bits each, with
the 193rd bit providing timing and other functions. An enhanced version of D4.
Unframed – Framing is disabled.
NOTE: When connecting to a V.35-compatible unit, refer to page A-4 for more
information before selecting this option.