Brooktrout Technology IRAS-24A w/ T1-RBS, Инструкция по установке и справочник

Страница: 162 / 188

C-12 IRAS-24A T1/ISDN Modem Card Installation and Reference Guide
Table C-2 Trace Values & Meanings
Value Meaning
Ch#
HDLC channel used for formatting; possible values are 0 – 64
a
Time
Hexadecimal timestamp incremented at 1 ms intervals
Direct Direction of frame; possible values are Xmit (transmitted by the board) and
Rcvd (received by board)
SAPI Service Access Point Identifier which identifies the type of D-channel
signaling performed; typical values are 00 (ISDN call control),16 (X.25
packet communication) or 63 (management procedures)
TEI Terminal Endpoint Identifier which identifies a particular endpoint device
C/R Command/Response bit that identifies the frame as either a command
(C)or response (R); possible values vary depending whether the PRI-PCI
board is performing user side or network side signaling. For user side
(Symmetric, V.120 or Q.922 LAP-F), 0 indicates a command and 1
indicates a response. For network side, 0 indicates a response and 1
indicates a command.
Type Q.921/Q.931 message frame or UNKNI for unknown Information frames
N(s) Sequence number assigned to the frame sent by the transmitting device
N(r) Expected sequence number of the next frame to be received from the
transmitting device
P/F
b Poll/final bit which indicates the device is polling for a response from the
other end, sending a final frame in response to a command, or neither.
Possible values are 1 (polling for response or responding to command) or
0 (not polling or unsolicited response).
Size Number of bytes in frame (shown in hexadecimal)
a. The trace function monitors messages received and transmitted by the processor side of
the HDLC controller. Because these messages pass through the MVIP switching matrix
between the HDLC controller and the network, you must map individual HDLC channels
to T1 spans using L4L3mSET_TSI commands. Depending on your mappings, the HDLC
channel numbers may not match the channel number of the span’s D-channel.
b. If the message frame is a command (based on the C/R bit), this is a Poll bit; if the mes-
sage frame is a response, this is a Final bit.