X.21 Direct Connect Card (6 CCT) This data card provides six CCITT X.21 interfaces. Two of the six interfaces are presented on the faceplate of the card via a 25 pair AMP CHAMP connector. The remaining four interfaces are available at the backplane connectors. This card also supports a subset of RS-449.

X.21 DIST PANEL (EU-TC AND OTHER) Mainstreet X.21 Distribution panel comes complete with shielded AMP Champ cable, for installation in other environments including Telecom Centres.

X.21 DIST PANEL 19 inch rack mountable assembly which provides backplane access to eight X.21 circuits via DB-15 connectors. Included are two 25 pair cables required to connect the distribution panel to the system.

X.21 DIST PNL 19 inch rack mountable assembly which provides backplane access to eight X.21 circuits via DB-15 connectors. Included are two 25 pair cables required to connect the distribution panel to the system.

X.21 ISDN 1602

X.21 MODULE (HCM2)

X.21 MODULE Supports both DTE and DCE operation. Supports both HCM and Transparent rate adaption. Two control leads supported: C/I. Supports NX56/64 super-rate operation. ***This module cannot be used as a source for system synchronization.***

X.21 PRI-2 CARD This card presents a 30 channel, X.21/V.11 interface. Allows for faceplate (DB-15) or backplane (50 pin Champ) access. Configured as a Data Termination Unit (DTE). Supported bit rates are from 64 Kbps to 1920 Kbps. Also supported by this card in generic 1113 or greater is reduced framing overhead allowing for additional HCM data.

X.21 PRI-2 CARD This card presents a 30 channel, X.21/V.11 interface. Allows for faceplate (DB-15) or backplane (50 pin Champ) access. Configured as a Data Termination Unit (DTE). Supported bit rates are from 64 Kbps to 1920 Kbps. Also supported by this card in generic 1113 or greater is reduced framing overhead allowing for additional HCM data.

X.21 PRI-2 ESI This card is similar to 90-0569-03 but is modified to support Krypto Gear-81 crypto units (encryption NTUs). Supported by Generic 1116 or greater.