Section 360-880-202
2
1.
GENERAL
1.1
Document Purpose
This document provides general, installation and testing information for the Secondary T1 Unit (ST1U), shown in
Figure 1. This document covers model number 3608-80.
1.2
Document Status
This document is reprinted to add additional features (”Dual” and “Protection” T1 modes).
1.3
Equipment Function
The ST1U is part of the 360-80 Intelligent Channel Bank (ICB). It combines the functions of a line interface unit
(LIU) and a channel service unit (CSU), allowing direct connections to public T1 networks. The ST1U is a secon-
dary T1 unit for the ICB, providing normal/drop and re-insert (D&RI), dual T1 mode and protection mode when
used with the T1 controller with SNMP (T1-S).
1.4
Equipment Location/Mounting
Mount the ST1U in the secondary (half-size) slot of the 360-80. One T1-S controller unit (issue 2 or later) must be
installed in the primary slot for proper system operation.
Note:
This unit must be mounted in an issue 3 or later 360-80 shelf.
1.5
Equipment Features
This unit provides the following features:
Downstream data blocking or broadcast for dropped timeslots (normal/D&RI mode only).
Independent T1 loop timing (dual T1 mode only).
Transport Protection switching (protection mode only).
Drop and re-insert operation with bypass (normal/D&RI mode only).
Front panel status LEDs.
Front panel T1 monitor jacks.
Time slot assignment on a per-channel basis.
Auto framing and identification (SF or ESF).
Auto line coding and identification (AMI or B8ZS).
Hot unit insertion or extraction.
24-channel T1 multiplexing operation (up to 48 channels in dual T1 or D &RI modes).
Temperature hardened (
−
40 to +65 C).
Combines the functions of a LIU and a CSU, allowing direct connections to public T1 networks.
Operates in either superframe (SF) or extended superframe (ESF) mode, uses AMI or B8ZS line
coding, & performs all loopback, test & performance monitoring of the T1 interface (local & remote).
UL/CSA listed and FCC verified.
Meets Bellcore 1089, 43801, 62411, 54016, TR-57 and ANSI T1.403 standards for T1.
1.6
Performance History
This unit stores performance history for the last 30 days in 24-hour intervals and over the last 24 hours in 15-min-
ute intervals. This performance history includes failed seconds, errored seconds and severely errored seconds
(per T1M1.3/93-00). The current 15-minute interval can be reset or the current 24-hour interval can be reset.
When the current 24-hour interval is reset all 15-minute intervals within those 24 hours are reset.
