Specifications

Chapter 6 TR-08 Option
6-2
provisions single shelf groups (designated as either shelf A, B, C, or D) using a single, non-
protected T1 line (designated as either Link A, B, C, or D, respectively) through programmable
assignment from the serving Central Office (CO) switch. See Figure 7-1 below for a generic TR-
08 implementation using the TR-08 Access Bank Is as Remote Terminals (RTs).
DSX
Cross-Connect
Frame
Class 5 End Office
CO Switch
Maintenance
Port
Above TR-08 Remote Terminals can be
Physically Separate or Collocated.
T1 Test Set
TR-08
Line
Side
Ports
TR-08
Distribution
Frame
Building
“A Link”
“B Link”
“C Link”
“D Link”
“A Link”
“B Link”
“C Link”
“D Link”
Access Bank Shelf "C"
Access Bank Shelf "A"
Access Bank Shelf "B"
Access Bank Shelf "D"
Battery
Backup
Battery
Backup
Battery
Backup
Battery
Backup
Figure 7-1: Generic Access Bank I TR-08 Operation
In TR-08 Mode I operation on the Access Bank I, only the A shelf group exchanges alarm
reporting information with the CO switch through the use of the T1 full-duplex SLC-96
(Subscriber Loop Carrier) data link. This data link is similar to the Facilities Data Link (FDL)
employed in ESF operation. Shelves B, C, and D do not exchange alarm reporting/monitoring
information with the switch over their respective B, C, and D links. Because CAC’s
implementation allows physically separate RT units, there is no method to collect errors
occurring or received on the B, C, or D links at the RT and communicate them over the A data
link to the switch.
Features and Functionality
Below are the details regarding TR-08 support on the Access Bank I:
• Cost and installation times are radically lower than with other Integrated Digital Loop
Carrier Systems (IDLCs).
• SLC-96 T1 framing types both with (shelf A) and without (Shelf B/C/D) alarm
reporting/monitoring on the A link are supported via a front-panel switch.
• Implementation is for Mode I non-concentrated shelf groups only.
• Standard maintenance and provisioning is provided at the switch-side for both
Ground Start (GS) and Loop Start (LS) circuits on a per-channel basis.
• Flexible alarm reporting conforms to both ORB-13 or ORB-16 specifications.
• Support is provided for the following SLC-96 analog voice interface types:
♦ Single Party Ringing (SPR) LS channel units with CLASS  service support,
including Distinctive Ringing and Caller ID (DMS or 5ESS)
♦ Universal Voice Grade (UVG) GS channel units with CLASS service support,
including Distinctive Ringing and Caller ID (DMS or 5ESS)