DS-1 configuration 2-3
Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
Table 2-1
DTCI shelf description
(continued)
Slot DescriptionNT_PECAbbreviation
15 UTR 6X92BB Universal tone receiver
16 EISP BX01AB ISDN signaling processor
17 Filler 0X50AA Filler panel
18 MI 6X69AC Message interface
19front Filler 0X50AA Filler face plate
19rear MX71AA XPM plus terminator board
20 CSM 6X42AA Channel supervision message card
21 FM 6X41AA Formatter
22front DS30 6X40FA DS-30 Interface (16-port). If this card
is provisioned, slot 23 is not used.
22rear 6X40GA ENET fiber interface card
23–24 Filler 0X50AA Filler face plate
25 PCONV 2X70AE Power converter
—end—
Commissioning
The frame formats, channel ordering sequence, line coding, network
customer terminating equipment and cross-connect point, and test equipment
requirements are described in the following subsections.
Frame formats
The DS-1 basic frame format consists of one byte per channel, (24 eight-bit
bytes) and one framing bit (F-bit), for a total of 193 bits per frame.
• The bit rate is 1.544 Mbit/s.
• The sampling rate for each channel is 8000 Hz.
• The 24 bytes are identified as time slots 1 through 24 (numbered
consecutively from the F-bit).
• A pattern is placed in the F-bit to identify the location of the signaling
frame.
• A superframe format (SF) consists of 12 DS-1 frames.
• Bit error rate (BER) monitoring is accomplished using two indicators:
bipolar violation (BPV) and cyclic redundancy check (CRC).
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