PairGain PG-Flex, Manual

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Central Office Terminal Equipment
7
ISDN Channel Units
ISDN is a networking standard that provides end-to-end, simultaneous handling of digitized voice
and data traffic on the same link. The ISDN Basic Rate Interface (BRI) channel unit provides an
interface to North American Integrated Services Digital Network (ISDN) basic access services
(see Figure 4). Each ISDN channel unit for PG-Flex supports four “U” interfaces with
provisionable sealing current and performance monitoring on each channel. Line termination (LT)
in the CO occurs at the ISDN switch. The channel unit provides the line unit termination at the RT,
and the subscriber site has the Network Termination (NT1).
Figure 4. Typical ISDN Arrangement
The main features of the ISDN channel unit are:
• four ISDN U-interfaces
• mechanized loop testing (MLT) compatible and metallic test access
• dc resistive test signatures
• mp/pp eoc slave mode in 3DS0 format
• segmented path performance monitoring
• interim path performance monitoring
• software provisioning
• loopbacks
• Pair Gain Test Controller (PGTC) compatible
• sealing current (RT)