NT5D11 and NT5D14 Lineside T1 Interface cards Page 199 of 906Circuit Card Description and InstallationThe lineside T1 card is an IPE line card that provides a cost-effectiveall-digital connection between T1 compatible terminal equipment (such asvoice mail systems, voice response units, and trading turrets) and the system.The terminal equipment is assured access to analog (500/2500-type)telephone type line functionality such as hook flash, SPRE codes andringback tones generated from the switch. Usually, the lineside T1 cardeliminates the need for channel bank type equipment normally placedbetween the switch and the terminal equipment. This provides a more robustand reliable end-to-end connection. The lineside T1 card supports linesupervision features such as loop and ground start protocols. It can also beused in an off-premise arrangement where analog (500/2500-type) telephonesare extended over T1 with the use of channel bank equipment.The lineside T1 interface offers significant improvement over the previousalternatives. For example, if a digital trunk connection were used, such aswith the DTI/PRI interface card, lineside functionality would not besupported. Previously, the only way to achieve the lineside functionality wasto use analog ports and channel bank equipment. No channel bank equipmentis required, resulting in a more robust and reliable connection.The lineside T1 interface offers a number of benefits when used to connect tothird-party applications equipment:• It is a more cost-effective alternative for connection because it eliminatesthe need for expensive channel bank equipment.• The lineside T1 supports powerful T1 monitoring and diagnosticcapability.• Overall costs for customer applications can also be reduced because theT1-compatible IPE is often more attractively priced than the analog-portalternatives.The lineside T1 card is compatible with all IPE based systems and standardpublic or private DSX-1 type carrier facilities. Using A/B robbed bitsignaling, it supports D4 or ESF channel framing formats as well as AMI orB8ZS coding. Because it uses standard PCM in standard T1 timeslots,existing T1 test equipment remains compatible for diagnostic and faultisolation purposes.
