Nortel SL-100 Product Manual page 57

Element
C-side interface
components
Messaging card with
downloadable tones
Signaling termination
cards
Tone detection/
reception
CLASS Modem
Resource (CMR) card
Peripheral/ Remote
Loader (PRL)
Copyright © 2006, Nortel Networks
.
Description
C-side interface components include the following:
• DS-512 optical fiber interface to Meridian SL-100 switching matrix.
•
Speech bus formatter and clock card that performs serial-to-parallel
conversion of encoded voice signals received through the DS-512
interface. It also performs parallel-to-serial conversion of encoded
voice signals destined for the DS-512 interface. Each parallel data
stream to/from the formatter is connected to a speech bus timeslot
through the Channel Supervision Message (CSM) interface card.
The clock section of the formatter provides the Line Group Controller
shelf clock.
• Channel Supervision Message interface card that performs parity
checking on the parallel data streams to/from the formatter and
monitors speech path integrity for each active call.
The messaging card interfaces with the parallel speech bus to provide
a C-side and P-side messaging interface using the DMSX protocol. In
particular, it accepts control messages from the Core and relays them to
other components. It also supports the provision of tones on outgoing
speech channels by means of a toneset downloaded to it as part of the
static XPM data.
The Enhanced D-channel Handler (EDCH) card terminates ISDN Basic
Rate Interface (BRI) signaling (that is, sends/receives messages to/from
the signaling channel of BRI lines).
The following optional cards are used to monitor speech bus channels
for incoming tones and report detected tones to the control processor:
• Universal Tone Receiver (UTR) - A Universal Tone receiver can
monitor up to 30 channels for event tones and digits.
• Global Tone Receiver (GTR) - An enhanced version of the Universal
Tone receiver that can detect up to 128 frequencies of u-law or A-law
tones on 60 or 30 channels simultaneously.
Note: A Line Group Controller can also make use of tone
detection/reception capabilities provides by a card in an Maintenance
Trunk Module (MTM) or Integrated Services Module (ISM) slot.
To support Custom Local Area Subscriber Services (CLASS) for analog
lines, a Line Group Controller can house a CLASS Modem resource
card. This card uses modem functionality to provide digital information
over analog lines (for example, to provide caller name and number
during silent intervals in the ringing cadence).
The Peripheral/Remote Loader is a 16-Mybte flash memory card that
stores Line Group Controller static data and a backup image of the
control processor, supporting rapid reload of the Line Group Controller
after a failure. Load files are transferred to the Peripheral/Remote Loader
as a background task while the Line Group Controller is at task level.
Communication Server 2100
Meridian SL-100 Product Guide
555-4001-103 20.01 Standard
SE09 20 October 2006
Line peripherals 57
Nortel Networks Confidential