Establishing monitor only access to a specific PCM channel carrying analog traffic, for the purpose of remotely monitoring the audio on that channel
Establishing PCM Monitor Access to the Circuit Under Test (CUT)
1. Before attaching the 930A to a PCM access point, configure it to match the transmission parameters of the T1 circuit you will be accessing:
A. Plug the unit in and turn on the power switch (red rocker switch at the top center of the rear panel).
Note: When a 930A is setup in PCM mode and not connected to an appropriate T1 source, it will periodically sound a beep and display the error message: NO PCM!. To disable the beeping, do the following:
1) Press the Option Menu button and using the front panel numeric keypad, enter 15, then press the ENT key (a grey button, located near the bottom right of the numeric keypad).
2) The unit will display BEEP ON ERR? YES NO. Press the "soft" key (blank grey button) directly under the displayed NO.
You can disable only the beep.
B. After the unit has booted up, press the Trunk Type button three times. It is the top button of the vertical row of buttons at the left of the front panel.
C. You should now see OPTIONAL TYPES: PCM. Additional optional trunk types may be displayed if they are installed. If you don't see the above display, use the up- and down-arrow keys (located near the bottom left of the display) to cycle through the trunk types until you do.
D. Press the softkey (blank grey button) located directly under the displayed PCM. You should now see a display similar to the one below: CH# 22 RECV-1 TERM EXT CLK SET-UP
E. Change the channel (DS0 time slot) number to the desired one use the up- and down-arrow keys located at the bottom left of the display.
F. If, instead of TERM, the display shows MON-1&2, skip to step "I." of this instruction.
G. Change the connection configuration from TERM to MON-1&2 by doing the following: Press the softkey under TERM. You should now see the display illustrated below.
SPAN: TERMINATE MON-1 MON-1&2 D&I
H. Press the softkey directly under the displayed MON-1&2 to configure the 930A so it will be able to monitor both directions of transmission. The display should now look similar to the illustration below:
CH# 22 RECV-1 MON-1&2 EXT CLK SET-UP
I. Now, press the softkey directly under the displayed SET-UP. You should see the display illustrated below:
IMPEDANCE: 100 OHM >1K OHM
If you will be connecting to the MONITOR jacks at a DSX-1 patch panel, press the softkey directly under the displayed 100 OHM. If you will be directly tapping onto T1 pairs, press the softkey under the displayed >1K OHM. DO NOT PLUG INTO THE SPLITTING JACKS OF A DSX-1 PATCH PANEL - YOU WILL DISRUPT THE T1 CIRCUIT!! (This instruction document assumes the desire for monitor access only)
J. You should now see the display illustrated below:
FRAMING: AUTO D4/SF ESF SLC-96
K. The 930A default is AUTO D4/SF. If the target T1 employs the Extended SuperFrame frame format, press the softkey directly under the displayed ESF. Otherwise, move to the next parameter by pressing the up-arrow key (located near the bottom left of the display). You should now see the display illustrated below:
SIGNALING: ROBBED-BIT CLEAR-CHANNEL
L. If there is a flashing cursor bar directly above ROBBED-BIT, move on to the next parameter by pressing the up-arrow key (located near the bottom left of the display). Otherwise, press the softkey directly under ROBBED-BIT. You should now see the display illustrated below:
LINE CODING: AMI AUTO-B8 B8ZS
M. If the target T1 employs Alternate Mark Inversion line coding, press the softkey directly under the displayed AMI; it uses Binary Eight Zero Substitution, press the softkey under B8ZS. You should now see the display illustrated below:
CHANNEL SEQUENCE: D3/D4 DID D2
N. Press the softkey directly under the channel (timeslot)-numbering sequence used in the target T1. Typically, it will be D3/D4 which numbers time slots sequentially from 1 through 24. You should now see the display illustrated below:
S'VSN: DEFINED NORMAL FXS FXO
O. Unless the DS0 circuit to be monitored is a Foreign Exchange (FX) circuit,
or employs non-standard supervision, press the softkey under the displayed NORMAL.