Nortel Networks 553-3001-211 manual NT5D11 and NT5D14 Lineside T1 Interface cards Page 187

NT5D11 and NT5D14 Lineside T1 Interface cards Page 187 of 894

The lineside T1 card is an IPE line card that provides a cost-effective all-digital connection between T1 compatible terminal equipment (such as voice 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 and ringback tones generated from the switch. Usually, the lineside T1 card eliminates the need for channel bank type equipment normally placed between the switch and the terminal equipment. This provides a more robust and reliable end-to-end connection. The lineside T1 card supports line supervision features such as loop and ground start protocols. It can also be used in an off-premise arrangement where analog (500/2500-type) telephones are extended over T1 with the use of channel bank equipment.

The lineside T1 interface offers significant improvement over the previous alternatives. For example, if a digital trunk connection were used, such as with the DTI/PRI interface card, lineside functionality would not be supported. Previously, the only way to achieve the lineside functionality was to use analog ports and channel bank equipment. No channel bank equipment is required, resulting in a more robust and reliable connection.

The lineside T1 interface offers a number of benefits when used to connect to third-party applications equipment:

•It is a more cost-effective alternative for connection because it eliminates the need for expensive channel bank equipment.

•The lineside T1 supports powerful T1 monitoring and diagnostic capability.

•Overall costs for customer applications can also be reduced because the T1-compatible IPE is often more attractively priced than the analog-port alternatives.

The lineside T1 card is compatible with all IPE based systems and standard public or private DSX-1 type carrier facilities. Using A/B robbed bit signaling, it supports D4 or ESF channel framing formats as well as AMI or B8ZS coding. Because it uses standard PCM in standard T1 timeslots, existing T1 test equipment remains compatible for diagnostic and fault isolation purposes.

Circuit Card Description and Installation