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Access Navigator - Release 1.8 August 2003 9-3
Provision DCS Service
Provisioning ISDN BRI Service
Provisioning ISDN BRI Service
Integrated Services Digital Network (ISDN) Basic Rate Interface (BRI) operates at 144,000 bits per
second and is designed for desktop service. ISDN BRI is also referred to as 2B+D because it provides
two Bearer channels (B1 and B2) at 64 kilobits per second, plus one D channel for signaling at 16
kilobits per second.
ISDN BRI settings and status depend on the mode.
l 3DS0 Mode transports each ISDN BRI as three DS0s, one each for the B1, B2, and D channels.
These DS0s are provisioned as digital crossconnects between groom and drop DS0s. The DS0
Type must be set to Data. No special ISDN commands are used.
l 4:1 TDM Mode transports each ISDN BRI as 2.25 DS0s, one for each B channel and 0.25 for the
D channel by multiplexing four D channels onto one DS0. This mode can efficiently carry 4 BRIs
using only 9 DS0s. This mode works with GR-303 switch interfaces, using a fixed connection for
the D channel and dynamically connecting the two B channels when needed.
The Access Navigator DCS supports ISDN BRI service (also called 2B+D) using the 3DS0 mode, in
which the two Bearer channels (B1 and B2) and a signaling channel (D) are crossconnected as three
DS0 data channels.
For ISDN BRI service using GR-303, see Provision ISDN BRI 4:1 TDM Service to Subscribers on
page 10-25.
Provisioning TR-08 Service with DCS
n Provisioning Conventional TR-08 Voice Services ... 9-4
n Provisioning Enhanced Voice and Data Services ... 9-5
n Special TR-08 Settings ... 9-5
Any Access Navigator can provide basic support for existing TR-08 channel banks configured as Shelf
B, C, or D channel units. The Access Navigator can groom and fill DS1s, but will not perform call
concentration, signaling translation, or Shelf A data link management.