Loss Plan Specifications - Nortel Meridian 1 Succession 1000 Manual

Page 186 of 236

Loss plan specifications

553-3001-182 Standard 1.00
Loss plan
Note: Facilities associated with the Nortel Networks Electronic
Switched Network (ESN) offering for dialing features are recommended
to be 4-wire for optimum transmission; thus, the 4-wire option is often
referred to as the ESN option and the 2-wire as the non-ESN option. The
presence or absence of the ESN package does not constrain the selection
of the facility termination option.
— With the 4-wire (ESN) option invoked, the loss insertion in each
direction is 0.5 dB less than for the 2-wire (non-ESN) option.
— PE E&M tie trunks (including satellite tie trunks) with QPC237C or
later vintage are compatible with the loss requirements of 4-wire
facility terminations (as recommended for ESN applications) and
are reflected thus in the loss plan; for earlier vintages and 2-wire PE
E&M tie trunks, the loss is 0.5þdB more in each direction.
The loss plan tables are in a matrix format. The transmission direction of the
loss values is shown by arrows. The values are independent of the originating
or terminating function of the ports connected. Positive values denote loss,
negative values denote gain, as shown below:
• In Table 70 (IPE ports to IPE ports), the electrical loss from an E&M tie
trunk to an analog telephone is 3.5 dB; in the reverse direction, the
electrical loss is 2.5 dB. (If the trunk is optioned for 2-wire facility
termination, the losses are 4 and 3 dB, respectively.)
• In Table 71 (digital ports to IPE ports), the electrical loss from a digital
tie trunk port to an analog E&M tie trunk is 3 dB; in the reverse direction,
the electrical loss has a negative value of –3 dB, indicating a 3 dB gain.
October 2003