112 CHAPTER 4: WAN INTERFACE CONFIGURATIONFor the PRI set, the system automatically creates a serial interface numbered serialnumber:23. This interface is logically equivalent to an ISDN PRI interface whereyou can make other configurations about:■ “DCC Configuration” on page 153■ “Configuring PPP” on page 367■ “IP Addressing Configuration” on page 623■ “Backup Center Configuration” on page 1961 if the interface is used as aprimary or secondary interface for backup■ “Configuring a Packet Filter Firewall” on page 1794Configuring OtherCT1/PRI InterfaceParametersFollow these steps to configure other CT1/PRI interface parameters:To do... Use the command... RemarksEnter system view system-view --Enter CT1/PRI interface view controller t1 number RequiredSet the line code format code { ami | b8zs } OptionalThe default is B8ZS 1.Set the cable length andattenuationcable long { 0db | -7.5db |-15db | -22.5db }cable short { 133ft | 266ft |399ft | 533ft | 655ft }OptionalThe long 0db keywordapplies by default.Set the clock mode clock { master | slave } OptionalThe default is slave, that is,line clock.Set the framing format frame-format { sf | esf } OptionalThe default is ESF.Enable user data inversion data-coding { normal |inverted }OptionalDisable user data inversion.Set the line idle code type idlecode { 7e | ff } OptionalThe default is 0x7E.Set the type of interframefilling tagitf type { 7e | ff } OptionalThe default is 0x7E.Set the number of interframefilling tagsitf number number OptionalThe default is 4.
