Specifications

Reference Guide
2-17
Applications Data Modules and Applications
The 8261 BRI “U” Card has all of the functionality of the 8260, however, switching between
the LT and NT modes must be done by making a menu selection and changing jumper
connections on the card. Also, the 8261, unlike the 8269 the card supports a user configurable
sealing current of 7.5mA or 15.0mA.
The 8262 BRI Card “S/T” Card 8262 BRI Card is designed to support “S/T” 4-wire interface
applications. This card provides TE, NT1 and NT2 emulation and is commonly used to
provide remote extension of four-wire BRI CPE devices from an ISDN PBX.
The 826x70 series of BRI cards are also designed to support external timing part of the
standard functionality. All BRI cards support extensive built in diagnostics and tests. Loop
backs can be generated on a per channel basis, with choice of loop back generation mode and
loop back codes. Built in BERT tests include off, mark, space, 1:1. 1:7, p_1, p_0, p_1:1, p_1:7.
The 8263 and 8264 BRI cards support 3 DS0 method to transport the overhead bits over
T1/E1. These new cards will have 8 U Interface ports which can be configured as LUNT (NT1
like line unit) or LULT (LT like line unit) for BRITE applications only.
In addition to all of the software configurable options on the BRI card itself, the BRI card has
the ability to remotely manage up to eight NTUs. The NTU’s DTE interface type, data rate
and asynchronous baud rate are a few options that are configurable through the BRI card
interface. This further enhances network manageability by accessing all ISDN equipment
from a single platform.
2.4.7 DSO-DP Card
The 8254 DSO Data Port/G.703 Data Unit (DSO-DP/G.703) is a plug-in user card for the
system. The DSO-DP/G.703 provides a 64 Kbps interface to a DSO of a T1/E1 network. The
card supports four (4) ports each of which provide a 64 Kbps interface to a DSO on a T1 or
E1 WAN link. Each DSO-DP/G.703 card can be installed in any User Slot and provides four
(4) DB15 female connectors.
The DSO-DP/G.703 card can be programmed to operate in either DSO-DP mode or in G.703
mode. In G.703 mode, the card supports either co-directional or contra-directional operation
and that option is set-able on a port-by-port basis. In DS0-DP mode, in addition to Transmit
Data and Receive Data, the card can be programmed to either provide a 64 Kbps bit clock and
an 8 kHz byte clock to the attached device or to receive those two clocks from the attached
device.
In G.703 Co-Directional mode, the Transmit Data and Receive Data leads are supported. The
clock information and the data make up a composite signal and the clock must be derived from
the data stream. In G.703 Contra-Directional mode, the port provides separate Transmit and
Receive Clocks to the attached device. Both clocks are 64 Kbps clocks with embedded 8 kHz
Bipolar Violations (BPVs) to mark the byte boundaries.