363-206-305
Circuit Pack Descriptions
7-54
Issue 3 June 2000
BBF8 High Data-Rate Digital Subscriber Line
(HDSL)
7
Purpose of Circuit
7
The HDSL circuit pack (BBF8) provides HDSL interface capability on the
DDM-2000 FiberReach shelf to compatible
PairGain
*
equipment at the customer
premises. It allows the transport of T1 payloads, for up to 12,000 feet, over two
metallic 24 AWG twisted-pair lines.
NOTE:
This capability is provided when the FiberReach shelf is equipped
with a 28-type OLIU in the Main slots.
The BBF8 circuit pack fits into the low-speed slots and provides two, four-wire
HDSL interfaces. Each interface provides a full DS1 payload capacity mapped to a
SONET VT1.5 and then VT cross-connected into an STS-1. Once in SONET, the
DS1 payload is treated as a normal DS1.
NOTE:
A maximum of three BBF8 HDSL circuit packs, including a protection
circuit pack, can be installed in one FiberReach shelf if 28-type
OLIUs are used.
HDSL Faceplate Indicator
7
The HDSL circuit pack FAULT indicator is shown in Figure 7-22. This red FAULT
LED is lit by the SYSCTL on detection of an HDSL circuit pack failure. In the event
of an incoming signal failure, this LED flashes on and off.
*
PairGain
is a registered trademark of PairGain Technologies, Inc.
To Next Page
Loading...
Need help?
General
