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A-2 August 2003 Access Navigator - Release 1.8
EOC Interface
Overview
Overview
The Access Navigator GR-303 complies with Telcordia® (Bellcore) standard GR-303. This specification
describes a Digital Loop Carrier (DLC) system that operates on T1 circuits. GR-303 management uses an
Embedded Operations Channel (EOC) enabling the local switch to provision GR-303 resources in the
Access Navigator. The local switch uses the Timeslot Management Channel (TMC), a dedicated DS0
channel, to set up cross-connects in the Access Navigator on a per-call basis, providing call concentration
and more efficient use of switch and facility resources.
Figure A-1. GR-303 Architecture with the Access Navigator
In the GR-303 network architecture (see Figure 1), the local switch is called the Integrated Digital Terminal
(IDT). The IDT connects to an intelligent Remote Digital Terminal (RDT), such as the Access Navigator.
Between the IDT and RDT, management and voice traffic flow over an Interface Group (IG) comprising
two or more T1s (DS1s). Dedicated DS0s in the IG carry the EOC and TMC. The remaining DS0s carry
voice frequency calls assigned by the switch.
Services defined on the EOC interface allow remote management of GR-303 resources in the Access
Navigator. GR-303 services are modeled by managed objects, which represent physical resources or support
Access
Navigator
GR-303
Voice &
ISDN BRI
Data
Switch
DS1s
GR-303
Interface
Group
Local
Digital
Switch
Integrated Digital
Terminal (IDT)
Remote Digital
Terminal (RDT)
Drop
DS1s
Key System
Fax
V.35, T1
or DSL
Router
Ethernet
PBX
Stations
Access Bank
Voice
and
Data
Voice
Lines
ACCE SS BAN K II
Tip & Ring
-48Vdc
Retu rn
Ground
T1
Span 1
T1 Test 2
T1 T es t 1
T1
Span 2
V.3 5
DCE
V.3 5
Status
RS23 2
Data
Adit 600
Voice
and
Data
ADIT 600
Customer Premises
P-Phones
P-Phone
(EBS)
DDS
ISDN BRI
T1 Drop
V.35
Router
Ethernet
PBX
Stations
RS232
VoIP
T1 Drop
Modem
10/100BaseT
Key System
Fax
FXS/FXO